URL
https://opencores.org/ocsvn/can/can/trunk
Subversion Repositories can
Compare Revisions
- This comparison shows the changes necessary to convert path
/can/tags/rel_10/rtl
- from Rev 101 to Rev 161
- ↔ Reverse comparison
Rev 101 → Rev 161
/verilog/can_btl.v
0,0 → 1,451
////////////////////////////////////////////////////////////////////// |
//// //// |
//// can_btl.v //// |
//// //// |
//// //// |
//// This file is part of the CAN Protocol Controller //// |
//// http://www.opencores.org/projects/can/ //// |
//// //// |
//// //// |
//// Author(s): //// |
//// Igor Mohor //// |
//// igorm@opencores.org //// |
//// //// |
//// //// |
//// All additional information is available in the README.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002, 2003 Authors //// |
//// //// |
//// This source file may be used and distributed without //// |
//// restriction provided that this copyright statement is not //// |
//// removed from the file and that any derivative work contains //// |
//// the original copyright notice and the associated disclaimer. //// |
//// //// |
//// This source file is free software; you can redistribute it //// |
//// and/or modify it under the terms of the GNU Lesser General //// |
//// Public License as published by the Free Software Foundation; //// |
//// either version 2.1 of the License, or (at your option) any //// |
//// later version. //// |
//// //// |
//// This source is distributed in the hope that it will be //// |
//// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
//// PURPOSE. See the GNU Lesser General Public License for more //// |
//// details. //// |
//// //// |
//// You should have received a copy of the GNU Lesser General //// |
//// Public License along with this source; if not, download it //// |
//// from http://www.opencores.org/lgpl.shtml //// |
//// //// |
//// The CAN protocol is developed by Robert Bosch GmbH and //// |
//// protected by patents. Anybody who wants to implement this //// |
//// CAN IP core on silicon has to obtain a CAN protocol license //// |
//// from Bosch. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
// |
// CVS Revision History |
// |
// $Log: not supported by cvs2svn $ |
// Revision 1.20 2003/06/20 14:51:11 mohor |
// Previous change removed. When resynchronization occurs we go to seg1 |
// stage. sync stage does not cause another start of seg1 stage. |
// |
// Revision 1.19 2003/06/20 14:28:20 mohor |
// When hard_sync or resync occure we need to go to seg1 segment. Going to |
// sync segment is in that case blocked. |
// |
// Revision 1.18 2003/06/17 15:53:33 mohor |
// clk_cnt reduced from [8:0] to [6:0]. |
// |
// Revision 1.17 2003/06/17 14:32:17 mohor |
// Removed few signals. |
// |
// Revision 1.16 2003/06/16 13:57:58 mohor |
// tx_point generated one clk earlier. rx_i registered. Data corrected when |
// using extended mode. |
// |
// Revision 1.15 2003/06/13 15:02:24 mohor |
// Synchronization is also needed when transmitting a message. |
// |
// Revision 1.14 2003/06/13 14:55:11 mohor |
// Counters width changed. |
// |
// Revision 1.13 2003/06/11 14:21:35 mohor |
// When switching to tx, sync stage is overjumped. |
// |
// Revision 1.12 2003/02/14 20:17:01 mohor |
// Several registers added. Not finished, yet. |
// |
// Revision 1.11 2003/02/09 18:40:29 mohor |
// Overload fixed. Hard synchronization also enabled at the last bit of |
// interframe. |
// |
// Revision 1.10 2003/02/09 02:24:33 mohor |
// Bosch license warning added. Error counters finished. Overload frames |
// still need to be fixed. |
// |
// Revision 1.9 2003/01/31 01:13:38 mohor |
// backup. |
// |
// Revision 1.8 2003/01/10 17:51:34 mohor |
// Temporary version (backup). |
// |
// Revision 1.7 2003/01/08 02:10:53 mohor |
// Acceptance filter added. |
// |
// Revision 1.6 2002/12/28 04:13:23 mohor |
// Backup version. |
// |
// Revision 1.5 2002/12/27 00:12:52 mohor |
// Header changed, testbench improved to send a frame (crc still missing). |
// |
// Revision 1.4 2002/12/26 01:33:05 mohor |
// Tripple sampling supported. |
// |
// Revision 1.3 2002/12/25 23:44:16 mohor |
// Commented lines removed. |
// |
// Revision 1.2 2002/12/25 14:17:00 mohor |
// Synchronization working. |
// |
// Revision 1.1.1.1 2002/12/20 16:39:21 mohor |
// Initial |
// |
// |
// |
|
// synopsys translate_off |
`include "timescale.v" |
// synopsys translate_on |
`include "can_defines.v" |
|
module can_btl |
( |
clk, |
rst, |
rx, |
|
/* Mode register */ |
reset_mode, |
|
/* Bus Timing 0 register */ |
baud_r_presc, |
sync_jump_width, |
|
/* Bus Timing 1 register */ |
time_segment1, |
time_segment2, |
triple_sampling, |
|
/* Output signals from this module */ |
sample_point, |
sampled_bit, |
sampled_bit_q, |
tx_point, |
hard_sync, |
|
/* Output from can_bsp module */ |
rx_idle, |
last_bit_of_inter, |
transmitting, |
go_rx_inter |
|
); |
|
parameter Tp = 1; |
|
input clk; |
input rst; |
input rx; |
|
/* Mode register */ |
input reset_mode; |
|
/* Bus Timing 0 register */ |
input [5:0] baud_r_presc; |
input [1:0] sync_jump_width; |
|
/* Bus Timing 1 register */ |
input [3:0] time_segment1; |
input [2:0] time_segment2; |
input triple_sampling; |
|
/* Output from can_bsp module */ |
input rx_idle; |
input last_bit_of_inter; |
input transmitting; |
input go_rx_inter; |
|
/* Output signals from this module */ |
output sample_point; |
output sampled_bit; |
output sampled_bit_q; |
output tx_point; |
output hard_sync; |
|
|
|
reg [6:0] clk_cnt; |
reg clk_en; |
reg clk_en_q; |
reg sync_blocked; |
reg hard_sync_blocked; |
reg sampled_bit; |
reg sampled_bit_q; |
reg [4:0] quant_cnt; |
reg [3:0] delay; |
reg sync; |
reg seg1; |
reg seg2; |
reg resync_latched; |
reg sample_point; |
reg [1:0] sample; |
reg go_sync; |
reg go_seg1; |
reg go_seg2; |
reg tx_point; |
|
wire go_sync_unregistered; |
wire go_seg1_unregistered; |
wire go_seg2_unregistered; |
wire [8:0] preset_cnt; |
wire sync_window; |
wire resync; |
wire quant_cnt_rst; |
|
|
|
assign preset_cnt = (baud_r_presc + 1'b1)<<1; // (BRP+1)*2 |
assign hard_sync = (rx_idle | last_bit_of_inter) & (~rx) & sampled_bit & (~hard_sync_blocked); // Hard synchronization |
assign resync = (~rx_idle) & (~last_bit_of_inter) & (~rx) & sampled_bit & (~sync_blocked) & (~(transmitting & seg1)); // Re-synchronization |
|
|
/* Generating general enable signal that defines baud rate. */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
clk_cnt <= 0; |
else if (clk_cnt >= (preset_cnt-1'b1)) |
clk_cnt <=#Tp 0; |
else |
clk_cnt <=#Tp clk_cnt + 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
clk_en <= 1'b0; |
else if (clk_cnt == (preset_cnt-1'b1)) |
clk_en <=#Tp 1'b1; |
else |
clk_en <=#Tp 1'b0; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
clk_en_q <= 1'b0; |
else |
clk_en_q <=#Tp clk_en; |
end |
|
|
|
/* Changing states */ |
assign go_sync_unregistered = clk_en & (seg2 & (~hard_sync) & (~resync) & ((quant_cnt[2:0] == time_segment2))); |
assign go_seg1_unregistered = clk_en & (((sync | hard_sync) & (~seg1)) | (resync & seg2 & sync_window) | (resync_latched & sync_window)); |
assign go_seg2_unregistered = clk_en & (seg1 & (~hard_sync) & (quant_cnt == (time_segment1 + delay))); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
go_sync <= 1'b0; |
else |
go_sync <=#Tp go_sync_unregistered; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
go_seg1 <= 1'b0; |
else |
go_seg1 <=#Tp go_seg1_unregistered; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
go_seg2 <= 1'b0; |
else |
go_seg2 <=#Tp go_seg2_unregistered; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tx_point <= 1'b0; |
else |
tx_point <=#Tp go_sync_unregistered | (go_seg1_unregistered & (~(sync | hard_sync))); |
end |
|
|
/* When early edge is detected outside of the SJW field, synchronization request is latched and performed when |
SJW is reached */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
resync_latched <= 1'b0; |
else if (resync & seg2 & (~sync_window)) |
resync_latched <=#Tp 1'b1; |
else if (go_seg1) |
resync_latched <= 1'b0; |
end |
|
|
|
/* Synchronization stage/segment */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
sync <= 0; |
else if (go_sync) |
sync <=#Tp 1'b1; |
else if (clk_en_q) |
sync <=#Tp 1'b0; |
end |
|
|
/* Seg1 stage/segment (together with propagation segment which is 1 quant long) */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
seg1 <= 1; |
else if (go_seg1) |
seg1 <=#Tp 1'b1; |
else if (go_seg2) |
seg1 <=#Tp 1'b0; |
end |
|
|
/* Seg2 stage/segment */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
seg2 <= 0; |
else if (go_seg2) |
seg2 <=#Tp 1'b1; |
else if (go_sync | go_seg1) |
seg2 <=#Tp 1'b0; |
end |
|
|
/* Quant counter */ |
assign quant_cnt_rst = go_sync | go_seg1 | go_seg2; |
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
quant_cnt <= 0; |
else if (quant_cnt_rst) |
quant_cnt <=#Tp 0; |
else if (clk_en_q) |
quant_cnt <=#Tp quant_cnt + 1'b1; |
end |
|
|
/* When late edge is detected (in seg1 stage), stage seg1 is prolonged. */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
delay <= 0; |
else if (clk_en_q & resync & seg1) |
delay <=#Tp (quant_cnt > {3'h0, sync_jump_width})? (sync_jump_width + 1'b1) : (quant_cnt + 1'b1); |
else if (go_sync | go_seg1) |
delay <=#Tp 0; |
end |
|
|
// If early edge appears within this window (in seg2 stage), phase error is fully compensated |
assign sync_window = ((time_segment2 - quant_cnt[2:0]) < ( sync_jump_width + 1'b1)); |
|
|
// Sampling data (memorizing two samples all the time). |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
sample <= 2'b11; |
else if (clk_en_q) |
sample <= {sample[0], rx}; |
end |
|
|
// When enabled, tripple sampling is done here. |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
begin |
sampled_bit <= 1; |
sampled_bit_q <= 1; |
sample_point <= 0; |
end |
else if (clk_en_q & (~hard_sync)) |
begin |
if (seg1 & (quant_cnt == (time_segment1 + delay))) |
begin |
sample_point <=#Tp 1; |
sampled_bit_q <=#Tp sampled_bit; |
if (triple_sampling) |
sampled_bit <=#Tp (sample[0] & sample[1]) | ( sample[0] & rx) | (sample[1] & rx); |
else |
sampled_bit <=#Tp rx; |
end |
end |
else |
sample_point <=#Tp 0; |
end |
|
|
|
/* Blocking synchronization (can occur only once in a bit time) */ |
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
sync_blocked <=#Tp 1'b0; |
else if (clk_en_q) |
begin |
if (resync) |
sync_blocked <=#Tp 1'b1; |
else if (seg2 & (quant_cnt[2:0] == time_segment2)) |
sync_blocked <=#Tp 1'b0; |
end |
end |
|
|
/* Blocking hard synchronization when occurs once or when we are transmitting a msg */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
hard_sync_blocked <=#Tp 1'b0; |
else if (hard_sync | transmitting & tx_point) |
hard_sync_blocked <=#Tp 1'b1; |
else if (go_rx_inter) |
hard_sync_blocked <=#Tp 1'b0; |
end |
|
|
|
|
|
endmodule |
/verilog/can_top.v
0,0 → 1,807
////////////////////////////////////////////////////////////////////// |
//// //// |
//// can_top.v //// |
//// //// |
//// //// |
//// This file is part of the CAN Protocol Controller //// |
//// http://www.opencores.org/projects/can/ //// |
//// //// |
//// //// |
//// Author(s): //// |
//// Igor Mohor //// |
//// igorm@opencores.org //// |
//// //// |
//// //// |
//// All additional information is available in the README.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002, 2003 Authors //// |
//// //// |
//// This source file may be used and distributed without //// |
//// restriction provided that this copyright statement is not //// |
//// removed from the file and that any derivative work contains //// |
//// the original copyright notice and the associated disclaimer. //// |
//// //// |
//// This source file is free software; you can redistribute it //// |
//// and/or modify it under the terms of the GNU Lesser General //// |
//// Public License as published by the Free Software Foundation; //// |
//// either version 2.1 of the License, or (at your option) any //// |
//// later version. //// |
//// //// |
//// This source is distributed in the hope that it will be //// |
//// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
//// PURPOSE. See the GNU Lesser General Public License for more //// |
//// details. //// |
//// //// |
//// You should have received a copy of the GNU Lesser General //// |
//// Public License along with this source; if not, download it //// |
//// from http://www.opencores.org/lgpl.shtml //// |
//// //// |
//// The CAN protocol is developed by Robert Bosch GmbH and //// |
//// protected by patents. Anybody who wants to implement this //// |
//// CAN IP core on silicon has to obtain a CAN protocol license //// |
//// from Bosch. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
// |
// CVS Revision History |
// |
// $Log: not supported by cvs2svn $ |
// Revision 1.37 2003/06/27 20:56:15 simons |
// Virtual silicon ram instances added. |
// |
// Revision 1.36 2003/06/17 14:30:30 mohor |
// "chip select" signal cs_can_i is used only when not using WISHBONE |
// interface. |
// |
// Revision 1.35 2003/06/16 13:57:58 mohor |
// tx_point generated one clk earlier. rx_i registered. Data corrected when |
// using extended mode. |
// |
// Revision 1.34 2003/06/13 15:02:24 mohor |
// Synchronization is also needed when transmitting a message. |
// |
// Revision 1.33 2003/06/11 14:21:35 mohor |
// When switching to tx, sync stage is overjumped. |
// |
// Revision 1.32 2003/06/09 11:32:36 mohor |
// Ports added for the CAN_BIST. |
// |
// Revision 1.31 2003/03/26 11:19:46 mohor |
// CAN interrupt is active low. |
// |
// Revision 1.30 2003/03/20 17:01:17 mohor |
// unix. |
// |
// Revision 1.28 2003/03/14 19:36:48 mohor |
// can_cs signal used for generation of the cs. |
// |
// Revision 1.27 2003/03/12 05:56:33 mohor |
// Bidirectional port_0_i changed to port_0_io. |
// input cs_can changed to cs_can_i. |
// |
// Revision 1.26 2003/03/12 04:39:40 mohor |
// rd_i and wr_i are active high signals. If 8051 is connected, these two signals |
// need to be negated one level higher. |
// |
// Revision 1.25 2003/03/12 04:17:36 mohor |
// 8051 interface added (besides WISHBONE interface). Selection is made in |
// can_defines.v file. |
// |
// Revision 1.24 2003/03/10 17:24:40 mohor |
// wire declaration added. |
// |
// Revision 1.23 2003/03/05 15:33:13 mohor |
// tx_o is now tristated signal. tx_oen and tx_o combined together. |
// |
// Revision 1.22 2003/03/05 15:01:56 mohor |
// Top level signal names changed. |
// |
// Revision 1.21 2003/03/01 22:53:33 mohor |
// Actel APA ram supported. |
// |
// Revision 1.20 2003/02/19 15:09:02 mohor |
// Incomplete sensitivity list fixed. |
// |
// Revision 1.19 2003/02/19 15:04:14 mohor |
// Typo fixed. |
// |
// Revision 1.18 2003/02/19 14:44:03 mohor |
// CAN core finished. Host interface added. Registers finished. |
// Synchronization to the wishbone finished. |
// |
// Revision 1.17 2003/02/18 00:10:15 mohor |
// Most of the registers added. Registers "arbitration lost capture", "error code |
// capture" + few more still need to be added. |
// |
// Revision 1.16 2003/02/14 20:17:01 mohor |
// Several registers added. Not finished, yet. |
// |
// Revision 1.15 2003/02/12 14:25:30 mohor |
// abort_tx added. |
// |
// Revision 1.14 2003/02/11 00:56:06 mohor |
// Wishbone interface added. |
// |
// Revision 1.13 2003/02/09 18:40:29 mohor |
// Overload fixed. Hard synchronization also enabled at the last bit of |
// interframe. |
// |
// Revision 1.12 2003/02/09 02:24:33 mohor |
// Bosch license warning added. Error counters finished. Overload frames |
// still need to be fixed. |
// |
// Revision 1.11 2003/02/04 14:34:52 mohor |
// *** empty log message *** |
// |
// Revision 1.10 2003/01/31 01:13:38 mohor |
// backup. |
// |
// Revision 1.9 2003/01/15 13:16:48 mohor |
// When a frame with "remote request" is received, no data is stored to |
// fifo, just the frame information (identifier, ...). Data length that |
// is stored is the received data length and not the actual data length |
// that is stored to fifo. |
// |
// Revision 1.8 2003/01/14 17:25:09 mohor |
// Addresses corrected to decimal values (previously hex). |
// |
// Revision 1.7 2003/01/10 17:51:34 mohor |
// Temporary version (backup). |
// |
// Revision 1.6 2003/01/09 21:54:45 mohor |
// rx fifo added. Not 100 % verified, yet. |
// |
// Revision 1.5 2003/01/08 02:10:56 mohor |
// Acceptance filter added. |
// |
// Revision 1.4 2002/12/28 04:13:23 mohor |
// Backup version. |
// |
// Revision 1.3 2002/12/27 00:12:52 mohor |
// Header changed, testbench improved to send a frame (crc still missing). |
// |
// Revision 1.2 2002/12/26 16:00:34 mohor |
// Testbench define file added. Clock divider register added. |
// |
// Revision 1.1.1.1 2002/12/20 16:39:21 mohor |
// Initial |
// |
// |
// |
|
// synopsys translate_off |
`include "timescale.v" |
// synopsys translate_on |
`include "can_defines.v" |
|
module can_top |
( |
`ifdef CAN_WISHBONE_IF |
wb_clk_i, |
wb_rst_i, |
wb_dat_i, |
wb_dat_o, |
wb_cyc_i, |
wb_stb_i, |
wb_we_i, |
wb_adr_i, |
wb_ack_o, |
`else |
rst_i, |
ale_i, |
rd_i, |
wr_i, |
port_0_io, |
cs_can_i, |
`endif |
clk_i, |
rx_i, |
tx_o, |
irq_on, |
clkout_o |
// Bist |
`ifdef CAN_BIST |
, |
// debug chain signals |
scanb_rst, // bist scan reset |
scanb_clk, // bist scan clock |
scanb_si, // bist scan serial in |
scanb_so, // bist scan serial out |
scanb_en // bist scan shift enable |
`endif |
); |
|
parameter Tp = 1; |
|
|
`ifdef CAN_WISHBONE_IF |
input wb_clk_i; |
input wb_rst_i; |
input [7:0] wb_dat_i; |
output [7:0] wb_dat_o; |
input wb_cyc_i; |
input wb_stb_i; |
input wb_we_i; |
input [7:0] wb_adr_i; |
output wb_ack_o; |
|
reg wb_ack_o; |
reg cs_sync1; |
reg cs_sync2; |
reg cs_sync3; |
|
reg cs_ack1; |
reg cs_ack2; |
reg cs_ack3; |
reg cs_sync_rst1; |
reg cs_sync_rst2; |
wire cs_can_i; |
`else |
input rst_i; |
input ale_i; |
input rd_i; |
input wr_i; |
inout [7:0] port_0_io; |
input cs_can_i; |
|
reg [7:0] addr_latched; |
reg wr_i_q; |
reg rd_i_q; |
`endif |
|
input clk_i; |
input rx_i; |
output tx_o; |
output irq_on; |
output clkout_o; |
|
// Bist |
`ifdef CAN_BIST |
input scanb_rst; // bist scan reset |
input scanb_clk; // bist scan clock |
input scanb_si; // bist scan serial in |
output scanb_so; // bist scan serial out |
input scanb_en; // bist scan shift enable |
`endif |
|
reg data_out_fifo_selected; |
|
|
wire irq_o; |
wire [7:0] data_out_fifo; |
wire [7:0] data_out_regs; |
|
|
/* Mode register */ |
wire reset_mode; |
wire listen_only_mode; |
wire acceptance_filter_mode; |
wire self_test_mode; |
|
/* Command register */ |
wire release_buffer; |
wire tx_request; |
wire abort_tx; |
wire self_rx_request; |
wire single_shot_transmission; |
|
/* Arbitration Lost Capture Register */ |
wire read_arbitration_lost_capture_reg; |
|
/* Error Code Capture Register */ |
wire read_error_code_capture_reg; |
wire [7:0] error_capture_code; |
|
/* Bus Timing 0 register */ |
wire [5:0] baud_r_presc; |
wire [1:0] sync_jump_width; |
|
/* Bus Timing 1 register */ |
wire [3:0] time_segment1; |
wire [2:0] time_segment2; |
wire triple_sampling; |
|
/* Error Warning Limit register */ |
wire [7:0] error_warning_limit; |
|
/* Rx Error Counter register */ |
wire we_rx_err_cnt; |
|
/* Tx Error Counter register */ |
wire we_tx_err_cnt; |
|
/* Clock Divider register */ |
wire extended_mode; |
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
wire [7:0] acceptance_code_0; |
|
/* Acceptance mask register */ |
wire [7:0] acceptance_mask_0; |
/* End: This section is for BASIC and EXTENDED mode */ |
|
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
wire [7:0] acceptance_code_1; |
wire [7:0] acceptance_code_2; |
wire [7:0] acceptance_code_3; |
|
/* Acceptance mask register */ |
wire [7:0] acceptance_mask_1; |
wire [7:0] acceptance_mask_2; |
wire [7:0] acceptance_mask_3; |
/* End: This section is for EXTENDED mode */ |
|
/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */ |
wire [7:0] tx_data_0; |
wire [7:0] tx_data_1; |
wire [7:0] tx_data_2; |
wire [7:0] tx_data_3; |
wire [7:0] tx_data_4; |
wire [7:0] tx_data_5; |
wire [7:0] tx_data_6; |
wire [7:0] tx_data_7; |
wire [7:0] tx_data_8; |
wire [7:0] tx_data_9; |
wire [7:0] tx_data_10; |
wire [7:0] tx_data_11; |
wire [7:0] tx_data_12; |
/* End: Tx data registers */ |
|
wire cs; |
|
/* Output signals from can_btl module */ |
wire sample_point; |
wire sampled_bit; |
wire sampled_bit_q; |
wire tx_point; |
wire hard_sync; |
|
/* output from can_bsp module */ |
wire rx_idle; |
wire transmitting; |
wire last_bit_of_inter; |
wire set_reset_mode; |
wire node_bus_off; |
wire error_status; |
wire [7:0] rx_err_cnt; |
wire [7:0] tx_err_cnt; |
wire rx_err_cnt_dummy; // The MSB is not displayed. It is just used for easier calculation (no counter overflow). |
wire tx_err_cnt_dummy; // The MSB is not displayed. It is just used for easier calculation (no counter overflow). |
wire transmit_status; |
wire receive_status; |
wire tx_successful; |
wire need_to_tx; |
wire overrun; |
wire info_empty; |
wire set_bus_error_irq; |
wire set_arbitration_lost_irq; |
wire [4:0] arbitration_lost_capture; |
wire node_error_passive; |
wire node_error_active; |
wire [6:0] rx_message_counter; |
wire tx_out; |
wire tx_oen; |
|
wire rst; |
wire we; |
wire [7:0] addr; |
wire [7:0] data_in; |
reg [7:0] data_out; |
reg rx_registered; |
|
/* Connecting can_registers module */ |
can_registers i_can_registers |
( |
.clk(clk_i), |
.rst(rst), |
.cs(cs), |
.we(we), |
.addr(addr), |
.data_in(data_in), |
.data_out(data_out_regs), |
.irq(irq_o), |
|
.sample_point(sample_point), |
.transmitting(transmitting), |
.set_reset_mode(set_reset_mode), |
.node_bus_off(node_bus_off), |
.error_status(error_status), |
.rx_err_cnt(rx_err_cnt), |
.tx_err_cnt(tx_err_cnt), |
.transmit_status(transmit_status), |
.receive_status(receive_status), |
.tx_successful(tx_successful), |
.need_to_tx(need_to_tx), |
.overrun(overrun), |
.info_empty(info_empty), |
.set_bus_error_irq(set_bus_error_irq), |
.set_arbitration_lost_irq(set_arbitration_lost_irq), |
.arbitration_lost_capture(arbitration_lost_capture), |
.node_error_passive(node_error_passive), |
.node_error_active(node_error_active), |
.rx_message_counter(rx_message_counter), |
|
|
/* Mode register */ |
.reset_mode(reset_mode), |
.listen_only_mode(listen_only_mode), |
.acceptance_filter_mode(acceptance_filter_mode), |
.self_test_mode(self_test_mode), |
|
/* Command register */ |
.clear_data_overrun(), |
.release_buffer(release_buffer), |
.abort_tx(abort_tx), |
.tx_request(tx_request), |
.self_rx_request(self_rx_request), |
.single_shot_transmission(single_shot_transmission), |
|
/* Arbitration Lost Capture Register */ |
.read_arbitration_lost_capture_reg(read_arbitration_lost_capture_reg), |
|
/* Error Code Capture Register */ |
.read_error_code_capture_reg(read_error_code_capture_reg), |
.error_capture_code(error_capture_code), |
|
/* Bus Timing 0 register */ |
.baud_r_presc(baud_r_presc), |
.sync_jump_width(sync_jump_width), |
|
/* Bus Timing 1 register */ |
.time_segment1(time_segment1), |
.time_segment2(time_segment2), |
.triple_sampling(triple_sampling), |
|
/* Error Warning Limit register */ |
.error_warning_limit(error_warning_limit), |
|
/* Rx Error Counter register */ |
.we_rx_err_cnt(we_rx_err_cnt), |
|
/* Tx Error Counter register */ |
.we_tx_err_cnt(we_tx_err_cnt), |
|
/* Clock Divider register */ |
.extended_mode(extended_mode), |
.clkout(clkout_o), |
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_0(acceptance_code_0), |
|
/* Acceptance mask register */ |
.acceptance_mask_0(acceptance_mask_0), |
/* End: This section is for BASIC and EXTENDED mode */ |
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_1(acceptance_code_1), |
.acceptance_code_2(acceptance_code_2), |
.acceptance_code_3(acceptance_code_3), |
|
/* Acceptance mask register */ |
.acceptance_mask_1(acceptance_mask_1), |
.acceptance_mask_2(acceptance_mask_2), |
.acceptance_mask_3(acceptance_mask_3), |
/* End: This section is for EXTENDED mode */ |
|
/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */ |
.tx_data_0(tx_data_0), |
.tx_data_1(tx_data_1), |
.tx_data_2(tx_data_2), |
.tx_data_3(tx_data_3), |
.tx_data_4(tx_data_4), |
.tx_data_5(tx_data_5), |
.tx_data_6(tx_data_6), |
.tx_data_7(tx_data_7), |
.tx_data_8(tx_data_8), |
.tx_data_9(tx_data_9), |
.tx_data_10(tx_data_10), |
.tx_data_11(tx_data_11), |
.tx_data_12(tx_data_12) |
/* End: Tx data registers */ |
); |
|
|
assign irq_on = ~irq_o; |
|
|
/* Connecting can_btl module */ |
can_btl i_can_btl |
( |
.clk(clk_i), |
.rst(rst), |
.rx(rx_registered), |
|
/* Mode register */ |
.reset_mode(reset_mode), |
|
/* Bus Timing 0 register */ |
.baud_r_presc(baud_r_presc), |
.sync_jump_width(sync_jump_width), |
|
/* Bus Timing 1 register */ |
.time_segment1(time_segment1), |
.time_segment2(time_segment2), |
.triple_sampling(triple_sampling), |
|
/* Output signals from this module */ |
.sample_point(sample_point), |
.sampled_bit(sampled_bit), |
.sampled_bit_q(sampled_bit_q), |
.tx_point(tx_point), |
.hard_sync(hard_sync), |
|
|
/* output from can_bsp module */ |
.rx_idle(rx_idle), |
.last_bit_of_inter(last_bit_of_inter), |
.transmitting(transmitting), |
.go_rx_inter(go_rx_inter) |
|
|
|
); |
|
|
|
can_bsp i_can_bsp |
( |
.clk(clk_i), |
.rst(rst), |
|
/* From btl module */ |
.sample_point(sample_point), |
.sampled_bit(sampled_bit), |
.sampled_bit_q(sampled_bit_q), |
.tx_point(tx_point), |
.hard_sync(hard_sync), |
|
.addr(addr), |
.data_in(data_in), |
.data_out(data_out_fifo), |
.fifo_selected(data_out_fifo_selected), |
|
/* Mode register */ |
.reset_mode(reset_mode), |
.listen_only_mode(listen_only_mode), |
.acceptance_filter_mode(acceptance_filter_mode), |
.self_test_mode(self_test_mode), |
|
/* Command register */ |
.release_buffer(release_buffer), |
.tx_request(tx_request), |
.abort_tx(abort_tx), |
.self_rx_request(self_rx_request), |
.single_shot_transmission(single_shot_transmission), |
|
/* Arbitration Lost Capture Register */ |
.read_arbitration_lost_capture_reg(read_arbitration_lost_capture_reg), |
|
/* Error Code Capture Register */ |
.read_error_code_capture_reg(read_error_code_capture_reg), |
.error_capture_code(error_capture_code), |
|
/* Error Warning Limit register */ |
.error_warning_limit(error_warning_limit), |
|
/* Rx Error Counter register */ |
.we_rx_err_cnt(we_rx_err_cnt), |
|
/* Tx Error Counter register */ |
.we_tx_err_cnt(we_tx_err_cnt), |
|
/* Clock Divider register */ |
.extended_mode(extended_mode), |
|
/* output from can_bsp module */ |
.rx_idle(rx_idle), |
.transmitting(transmitting), |
.go_rx_inter(go_rx_inter), |
.last_bit_of_inter(last_bit_of_inter), |
.set_reset_mode(set_reset_mode), |
.node_bus_off(node_bus_off), |
.error_status(error_status), |
.rx_err_cnt({rx_err_cnt_dummy, rx_err_cnt[7:0]}), // The MSB is not displayed. It is just used for easier calculation (no counter overflow). |
.tx_err_cnt({tx_err_cnt_dummy, tx_err_cnt[7:0]}), // The MSB is not displayed. It is just used for easier calculation (no counter overflow). |
.transmit_status(transmit_status), |
.receive_status(receive_status), |
.tx_successful(tx_successful), |
.need_to_tx(need_to_tx), |
.overrun(overrun), |
.info_empty(info_empty), |
.set_bus_error_irq(set_bus_error_irq), |
.set_arbitration_lost_irq(set_arbitration_lost_irq), |
.arbitration_lost_capture(arbitration_lost_capture), |
.node_error_passive(node_error_passive), |
.node_error_active(node_error_active), |
.rx_message_counter(rx_message_counter), |
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_0(acceptance_code_0), |
|
/* Acceptance mask register */ |
.acceptance_mask_0(acceptance_mask_0), |
/* End: This section is for BASIC and EXTENDED mode */ |
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_1(acceptance_code_1), |
.acceptance_code_2(acceptance_code_2), |
.acceptance_code_3(acceptance_code_3), |
|
/* Acceptance mask register */ |
.acceptance_mask_1(acceptance_mask_1), |
.acceptance_mask_2(acceptance_mask_2), |
.acceptance_mask_3(acceptance_mask_3), |
/* End: This section is for EXTENDED mode */ |
|
/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */ |
.tx_data_0(tx_data_0), |
.tx_data_1(tx_data_1), |
.tx_data_2(tx_data_2), |
.tx_data_3(tx_data_3), |
.tx_data_4(tx_data_4), |
.tx_data_5(tx_data_5), |
.tx_data_6(tx_data_6), |
.tx_data_7(tx_data_7), |
.tx_data_8(tx_data_8), |
.tx_data_9(tx_data_9), |
.tx_data_10(tx_data_10), |
.tx_data_11(tx_data_11), |
.tx_data_12(tx_data_12), |
/* End: Tx data registers */ |
|
/* Tx signal */ |
.tx(tx_out), |
.tx_oen(tx_oen) |
|
`ifdef CAN_BIST |
, |
/* BIST signals */ |
.scanb_rst(scanb_rst), |
.scanb_clk(scanb_clk), |
.scanb_si(scanb_si), |
.scanb_so(scanb_so), |
.scanb_en(scanb_en) |
`endif |
); |
|
assign tx_o = tx_oen? 1'bz : tx_out; |
|
|
// Multiplexing wb_dat_o from registers and rx fifo |
always @ (extended_mode or addr or reset_mode) |
begin |
if (extended_mode & (~reset_mode) & ((addr >= 8'd16) && (addr <= 8'd28)) | (~extended_mode) & ((addr >= 8'd20) && (addr <= 8'd29))) |
data_out_fifo_selected <= 1'b1; |
else |
data_out_fifo_selected <= 1'b0; |
end |
|
|
always @ (posedge clk_i) |
begin |
// if (wb_cyc_i & (~wb_we_i)) |
if (cs & (~we)) |
begin |
if (data_out_fifo_selected) |
data_out <=#Tp data_out_fifo; |
else |
data_out <=#Tp data_out_regs; |
end |
end |
|
|
|
always @ (posedge clk_i or posedge rst) |
begin |
if (rst) |
rx_registered <= 1'b1; |
else |
rx_registered <=#Tp rx_i; |
end |
|
|
|
`ifdef CAN_WISHBONE_IF |
|
assign cs_can_i = 1'b1; |
|
// Combining wb_cyc_i and wb_stb_i signals to cs signal. Than synchronizing to clk_i clock domain. |
always @ (posedge clk_i or posedge rst) |
begin |
if (rst) |
begin |
cs_sync1 <= 1'b0; |
cs_sync2 <= 1'b0; |
cs_sync3 <= 1'b0; |
cs_sync_rst1 <= 1'b0; |
cs_sync_rst2 <= 1'b0; |
end |
else |
begin |
cs_sync1 <=#Tp wb_cyc_i & wb_stb_i & (~cs_sync_rst2) & cs_can_i; |
cs_sync2 <=#Tp cs_sync1 & (~cs_sync_rst2); |
cs_sync3 <=#Tp cs_sync2 & (~cs_sync_rst2); |
cs_sync_rst1 <=#Tp cs_ack3; |
cs_sync_rst2 <=#Tp cs_sync_rst1; |
end |
end |
|
|
assign cs = cs_sync2 & (~cs_sync3); |
|
|
always @ (posedge wb_clk_i) |
begin |
cs_ack1 <=#Tp cs_sync3; |
cs_ack2 <=#Tp cs_ack1; |
cs_ack3 <=#Tp cs_ack2; |
end |
|
|
|
// Generating acknowledge signal |
always @ (posedge wb_clk_i) |
begin |
wb_ack_o <=#Tp (cs_ack2 & (~cs_ack3)); |
end |
|
|
assign rst = wb_rst_i; |
assign we = wb_we_i; |
assign addr = wb_adr_i; |
assign data_in = wb_dat_i; |
assign wb_dat_o = data_out; |
|
|
`else |
|
// Latching address |
always @ (negedge clk_i or posedge rst) |
begin |
if (rst) |
addr_latched <= 8'h0; |
else if (ale_i) |
addr_latched <=#Tp port_0_io; |
end |
|
|
// Generating delayed wr_i and rd_i signals |
always @ (posedge clk_i or posedge rst) |
begin |
if (rst) |
begin |
wr_i_q <= 1'b0; |
rd_i_q <= 1'b0; |
end |
else |
begin |
wr_i_q <=#Tp wr_i; |
rd_i_q <=#Tp rd_i; |
end |
end |
|
|
assign cs = ((wr_i & (~wr_i_q)) | (rd_i & (~rd_i_q))) & cs_can_i; |
|
|
assign rst = rst_i; |
assign we = wr_i; |
assign addr = addr_latched; |
assign data_in = port_0_io; |
assign port_0_io = (cs_can_i & rd_i)? data_out : 8'hz; |
|
`endif |
|
|
endmodule |
/verilog/can_bsp.v
0,0 → 1,2063
////////////////////////////////////////////////////////////////////// |
//// //// |
//// can_bsp.v //// |
//// //// |
//// //// |
//// This file is part of the CAN Protocol Controller //// |
//// http://www.opencores.org/projects/can/ //// |
//// //// |
//// //// |
//// Author(s): //// |
//// Igor Mohor //// |
//// igorm@opencores.org //// |
//// //// |
//// //// |
//// All additional information is available in the README.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002, 2003 Authors //// |
//// //// |
//// This source file may be used and distributed without //// |
//// restriction provided that this copyright statement is not //// |
//// removed from the file and that any derivative work contains //// |
//// the original copyright notice and the associated disclaimer. //// |
//// //// |
//// This source file is free software; you can redistribute it //// |
//// and/or modify it under the terms of the GNU Lesser General //// |
//// Public License as published by the Free Software Foundation; //// |
//// either version 2.1 of the License, or (at your option) any //// |
//// later version. //// |
//// //// |
//// This source is distributed in the hope that it will be //// |
//// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
//// PURPOSE. See the GNU Lesser General Public License for more //// |
//// details. //// |
//// //// |
//// You should have received a copy of the GNU Lesser General //// |
//// Public License along with this source; if not, download it //// |
//// from http://www.opencores.org/lgpl.shtml //// |
//// //// |
//// The CAN protocol is developed by Robert Bosch GmbH and //// |
//// protected by patents. Anybody who wants to implement this //// |
//// CAN IP core on silicon has to obtain a CAN protocol license //// |
//// from Bosch. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
// |
// CVS Revision History |
// |
// $Log: not supported by cvs2svn $ |
// Revision 1.35 2003/06/27 20:56:12 simons |
// Virtual silicon ram instances added. |
// |
// Revision 1.34 2003/06/22 09:43:03 mohor |
// synthesis full_case parallel_case fixed. |
// |
// Revision 1.33 2003/06/21 12:16:30 mohor |
// paralel_case and full_case compiler directives added to case statements. |
// |
// Revision 1.32 2003/06/17 14:28:32 mohor |
// Form error was detected when stuff bit occured at the end of crc. |
// |
// Revision 1.31 2003/06/16 14:31:29 tadejm |
// Bit stuffing corrected when stuffing comes at the end of the crc. |
// |
// Revision 1.30 2003/06/16 13:57:58 mohor |
// tx_point generated one clk earlier. rx_i registered. Data corrected when |
// using extended mode. |
// |
// Revision 1.29 2003/06/11 14:21:35 mohor |
// When switching to tx, sync stage is overjumped. |
// |
// Revision 1.28 2003/03/01 22:53:33 mohor |
// Actel APA ram supported. |
// |
// Revision 1.27 2003/02/20 00:26:02 mohor |
// When a dominant bit was detected at the third bit of the intermission and |
// node had a message to transmit, bit_stuff error could occur. Fixed. |
// |
// Revision 1.26 2003/02/19 23:21:54 mohor |
// When bit error occured while active error flag was transmitted, counter was |
// not incremented. |
// |
// Revision 1.25 2003/02/19 14:44:03 mohor |
// CAN core finished. Host interface added. Registers finished. |
// Synchronization to the wishbone finished. |
// |
// Revision 1.24 2003/02/18 00:10:15 mohor |
// Most of the registers added. Registers "arbitration lost capture", "error code |
// capture" + few more still need to be added. |
// |
// Revision 1.23 2003/02/14 20:17:01 mohor |
// Several registers added. Not finished, yet. |
// |
// Revision 1.22 2003/02/12 14:23:59 mohor |
// abort_tx added. Bit destuff fixed. |
// |
// Revision 1.21 2003/02/11 00:56:06 mohor |
// Wishbone interface added. |
// |
// Revision 1.20 2003/02/10 16:02:11 mohor |
// CAN is working according to the specification. WB interface and more |
// registers (status, IRQ, ...) needs to be added. |
// |
// Revision 1.19 2003/02/09 18:40:29 mohor |
// Overload fixed. Hard synchronization also enabled at the last bit of |
// interframe. |
// |
// Revision 1.18 2003/02/09 02:24:33 mohor |
// Bosch license warning added. Error counters finished. Overload frames |
// still need to be fixed. |
// |
// Revision 1.17 2003/02/04 17:24:41 mohor |
// Backup. |
// |
// Revision 1.16 2003/02/04 14:34:52 mohor |
// *** empty log message *** |
// |
// Revision 1.15 2003/01/31 01:13:37 mohor |
// backup. |
// |
// Revision 1.14 2003/01/16 13:36:19 mohor |
// Form error supported. When receiving messages, last bit of the end-of-frame |
// does not generate form error. Receiver goes to the idle mode one bit sooner. |
// (CAN specification ver 2.0, part B, page 57). |
// |
// Revision 1.13 2003/01/15 21:59:45 mohor |
// Data is stored to fifo at the end of ack stage. |
// |
// Revision 1.12 2003/01/15 21:05:11 mohor |
// CRC checking fixed (when bitstuff occurs at the end of a CRC sequence). |
// |
// Revision 1.11 2003/01/15 14:40:23 mohor |
// RX state machine fixed to receive "remote request" frames correctly. |
// No data bytes are written to fifo when such frames are received. |
// |
// Revision 1.10 2003/01/15 13:16:47 mohor |
// When a frame with "remote request" is received, no data is stored to |
// fifo, just the frame information (identifier, ...). Data length that |
// is stored is the received data length and not the actual data length |
// that is stored to fifo. |
// |
// Revision 1.9 2003/01/14 12:19:35 mohor |
// rx_fifo is now working. |
// |
// Revision 1.8 2003/01/10 17:51:33 mohor |
// Temporary version (backup). |
// |
// Revision 1.7 2003/01/09 21:54:45 mohor |
// rx fifo added. Not 100 % verified, yet. |
// |
// Revision 1.6 2003/01/09 14:46:58 mohor |
// Temporary files (backup). |
// |
// Revision 1.5 2003/01/08 13:30:31 mohor |
// Temp version. |
// |
// Revision 1.4 2003/01/08 02:10:53 mohor |
// Acceptance filter added. |
// |
// Revision 1.3 2002/12/28 04:13:23 mohor |
// Backup version. |
// |
// Revision 1.2 2002/12/27 00:12:52 mohor |
// Header changed, testbench improved to send a frame (crc still missing). |
// |
// Revision 1.1.1.1 2002/12/20 16:39:21 mohor |
// Initial |
// |
// |
// |
|
// synopsys translate_off |
`include "timescale.v" |
// synopsys translate_on |
`include "can_defines.v" |
|
module can_bsp |
( |
clk, |
rst, |
|
sample_point, |
sampled_bit, |
sampled_bit_q, |
tx_point, |
hard_sync, |
|
addr, |
data_in, |
data_out, |
fifo_selected, |
|
|
|
/* Mode register */ |
reset_mode, |
listen_only_mode, |
acceptance_filter_mode, |
self_test_mode, |
|
/* Command register */ |
release_buffer, |
tx_request, |
abort_tx, |
self_rx_request, |
single_shot_transmission, |
|
/* Arbitration Lost Capture Register */ |
read_arbitration_lost_capture_reg, |
|
/* Error Code Capture Register */ |
read_error_code_capture_reg, |
error_capture_code, |
|
/* Error Warning Limit register */ |
error_warning_limit, |
|
/* Rx Error Counter register */ |
we_rx_err_cnt, |
|
/* Tx Error Counter register */ |
we_tx_err_cnt, |
|
/* Clock Divider register */ |
extended_mode, |
|
rx_idle, |
transmitting, |
go_rx_inter, |
last_bit_of_inter, |
set_reset_mode, |
node_bus_off, |
error_status, |
rx_err_cnt, |
tx_err_cnt, |
transmit_status, |
receive_status, |
tx_successful, |
need_to_tx, |
overrun, |
info_empty, |
set_bus_error_irq, |
set_arbitration_lost_irq, |
arbitration_lost_capture, |
node_error_passive, |
node_error_active, |
rx_message_counter, |
|
|
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
acceptance_code_0, |
|
/* Acceptance mask register */ |
acceptance_mask_0, |
/* End: This section is for BASIC and EXTENDED mode */ |
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
acceptance_code_1, |
acceptance_code_2, |
acceptance_code_3, |
|
/* Acceptance mask register */ |
acceptance_mask_1, |
acceptance_mask_2, |
acceptance_mask_3, |
/* End: This section is for EXTENDED mode */ |
|
/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */ |
tx_data_0, |
tx_data_1, |
tx_data_2, |
tx_data_3, |
tx_data_4, |
tx_data_5, |
tx_data_6, |
tx_data_7, |
tx_data_8, |
tx_data_9, |
tx_data_10, |
tx_data_11, |
tx_data_12, |
/* End: Tx data registers */ |
|
/* Tx signal */ |
tx, |
tx_oen |
|
/* Bist */ |
`ifdef CAN_BIST |
, |
scanb_rst, |
scanb_clk, |
scanb_si, |
scanb_so, |
scanb_en |
`endif |
); |
|
parameter Tp = 1; |
|
input clk; |
input rst; |
input sample_point; |
input sampled_bit; |
input sampled_bit_q; |
input tx_point; |
input hard_sync; |
input [7:0] addr; |
input [7:0] data_in; |
output [7:0] data_out; |
input fifo_selected; |
|
|
input reset_mode; |
input listen_only_mode; |
input acceptance_filter_mode; |
input extended_mode; |
input self_test_mode; |
|
|
/* Command register */ |
input release_buffer; |
input tx_request; |
input abort_tx; |
input self_rx_request; |
input single_shot_transmission; |
|
/* Arbitration Lost Capture Register */ |
input read_arbitration_lost_capture_reg; |
|
/* Error Code Capture Register */ |
input read_error_code_capture_reg; |
output [7:0] error_capture_code; |
|
/* Error Warning Limit register */ |
input [7:0] error_warning_limit; |
|
/* Rx Error Counter register */ |
input we_rx_err_cnt; |
|
/* Tx Error Counter register */ |
input we_tx_err_cnt; |
|
output rx_idle; |
output transmitting; |
output go_rx_inter; |
output last_bit_of_inter; |
output set_reset_mode; |
output node_bus_off; |
output error_status; |
output [8:0] rx_err_cnt; |
output [8:0] tx_err_cnt; |
output transmit_status; |
output receive_status; |
output tx_successful; |
output need_to_tx; |
output overrun; |
output info_empty; |
output set_bus_error_irq; |
output set_arbitration_lost_irq; |
output [4:0] arbitration_lost_capture; |
output node_error_passive; |
output node_error_active; |
output [6:0] rx_message_counter; |
|
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
input [7:0] acceptance_code_0; |
|
/* Acceptance mask register */ |
input [7:0] acceptance_mask_0; |
|
/* End: This section is for BASIC and EXTENDED mode */ |
|
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
input [7:0] acceptance_code_1; |
input [7:0] acceptance_code_2; |
input [7:0] acceptance_code_3; |
|
/* Acceptance mask register */ |
input [7:0] acceptance_mask_1; |
input [7:0] acceptance_mask_2; |
input [7:0] acceptance_mask_3; |
/* End: This section is for EXTENDED mode */ |
|
/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */ |
input [7:0] tx_data_0; |
input [7:0] tx_data_1; |
input [7:0] tx_data_2; |
input [7:0] tx_data_3; |
input [7:0] tx_data_4; |
input [7:0] tx_data_5; |
input [7:0] tx_data_6; |
input [7:0] tx_data_7; |
input [7:0] tx_data_8; |
input [7:0] tx_data_9; |
input [7:0] tx_data_10; |
input [7:0] tx_data_11; |
input [7:0] tx_data_12; |
/* End: Tx data registers */ |
|
/* Tx signal */ |
output tx; |
output tx_oen; |
|
/* Bist */ |
`ifdef CAN_BIST |
input scanb_rst; |
input scanb_clk; |
input scanb_si; |
output scanb_so; |
input scanb_en; |
`endif |
|
reg reset_mode_q; |
reg [5:0] bit_cnt; |
|
reg [3:0] data_len; |
reg [28:0] id; |
reg [2:0] bit_stuff_cnt; |
reg [2:0] bit_stuff_cnt_tx; |
reg tx_point_q; |
|
reg rx_idle; |
reg rx_id1; |
reg rx_rtr1; |
reg rx_ide; |
reg rx_id2; |
reg rx_rtr2; |
reg rx_r1; |
reg rx_r0; |
reg rx_dlc; |
reg rx_data; |
reg rx_crc; |
reg rx_crc_lim; |
reg rx_ack; |
reg rx_ack_lim; |
reg rx_eof; |
reg rx_inter; |
reg go_early_tx_latched; |
|
reg rtr1; |
reg ide; |
reg rtr2; |
reg [14:0] crc_in; |
|
reg [7:0] tmp_data; |
reg [7:0] tmp_fifo [0:7]; |
reg write_data_to_tmp_fifo; |
reg [2:0] byte_cnt; |
reg bit_stuff_cnt_en; |
reg bit_stuff_cnt_tx_en; |
reg crc_enable; |
|
reg [2:0] eof_cnt; |
reg [2:0] passive_cnt; |
|
reg transmitting; |
|
reg error_frame; |
reg error_frame_q; |
reg enable_error_cnt2; |
reg [2:0] error_cnt1; |
reg [2:0] error_cnt2; |
reg [2:0] delayed_dominant_cnt; |
reg enable_overload_cnt2; |
reg overload_frame; |
reg overload_frame_blocked; |
reg [2:0] overload_cnt1; |
reg [2:0] overload_cnt2; |
reg tx; |
reg crc_err; |
|
reg arbitration_lost; |
reg arbitration_lost_q; |
reg [4:0] arbitration_lost_capture; |
reg arbitration_cnt_en; |
reg arbitration_blocked; |
reg tx_q; |
|
reg need_to_tx; // When the CAN core has something to transmit and a dominant bit is sampled at the third bit |
reg [3:0] data_cnt; // Counting the data bytes that are written to FIFO |
reg [2:0] header_cnt; // Counting header length |
reg wr_fifo; // Write data and header to 64-byte fifo |
reg [7:0] data_for_fifo;// Multiplexed data that is stored to 64-byte fifo |
|
reg [5:0] tx_pointer; |
reg tx_bit; |
reg tx_state; |
reg transmitter; |
reg finish_msg; |
|
reg [8:0] rx_err_cnt; |
reg [8:0] tx_err_cnt; |
reg rx_err_cnt_blocked; |
reg [3:0] bus_free_cnt; |
reg bus_free_cnt_en; |
reg bus_free; |
reg waiting_for_bus_free; |
|
reg node_error_passive; |
reg node_bus_off; |
reg node_bus_off_q; |
reg ack_err_latched; |
reg bit_err_latched; |
reg stuff_err_latched; |
reg form_err_latched; |
reg rule3_exc1_1; |
reg rule3_exc1_2; |
reg rule3_exc2; |
reg suspend; |
reg susp_cnt_en; |
reg [2:0] susp_cnt; |
reg error_flag_over_blocked; |
|
reg [7:0] error_capture_code; |
reg [7:6] error_capture_code_type; |
reg error_capture_code_blocked; |
|
wire [4:0] error_capture_code_segment; |
wire error_capture_code_direction; |
|
wire bit_de_stuff; |
wire bit_de_stuff_tx; |
|
wire rule5; |
|
/* Rx state machine */ |
wire go_rx_idle; |
wire go_rx_id1; |
wire go_rx_rtr1; |
wire go_rx_ide; |
wire go_rx_id2; |
wire go_rx_rtr2; |
wire go_rx_r1; |
wire go_rx_r0; |
wire go_rx_dlc; |
wire go_rx_data; |
wire go_rx_crc; |
wire go_rx_crc_lim; |
wire go_rx_ack; |
wire go_rx_ack_lim; |
wire go_rx_eof; |
wire go_overload_frame; |
wire go_rx_inter; |
wire go_error_frame; |
|
wire go_crc_enable; |
wire rst_crc_enable; |
|
wire bit_de_stuff_set; |
wire bit_de_stuff_reset; |
|
wire go_early_tx; |
wire go_tx; |
|
wire [14:0] calculated_crc; |
wire [15:0] r_calculated_crc; |
wire remote_rq; |
wire [3:0] limited_data_len; |
wire form_err; |
|
wire error_frame_ended; |
wire overload_frame_ended; |
wire bit_err; |
wire ack_err; |
wire stuff_err; |
// of intermission, it starts reading the identifier (and transmitting its own). |
wire overload_needed = 0; // When receiver is busy, it needs to send overload frame. Only 2 overload frames are allowed to |
// be send in a row. This is not implemented because host can not send an overload request. |
|
wire id_ok; // If received ID matches ID set in registers |
wire no_byte0; // There is no byte 0 (RTR bit set to 1 or DLC field equal to 0). Signal used for acceptance filter. |
wire no_byte1; // There is no byte 1 (RTR bit set to 1 or DLC field equal to 1). Signal used for acceptance filter. |
|
wire [2:0] header_len; |
wire storing_header; |
wire [3:0] limited_data_len_minus1; |
wire reset_wr_fifo; |
wire err; |
|
wire arbitration_field; |
|
wire [18:0] basic_chain; |
wire [63:0] basic_chain_data; |
wire [18:0] extended_chain_std; |
wire [38:0] extended_chain_ext; |
wire [63:0] extended_chain_data_std; |
wire [63:0] extended_chain_data_ext; |
|
wire rst_tx_pointer; |
|
wire [7:0] r_tx_data_0; |
wire [7:0] r_tx_data_1; |
wire [7:0] r_tx_data_2; |
wire [7:0] r_tx_data_3; |
wire [7:0] r_tx_data_4; |
wire [7:0] r_tx_data_5; |
wire [7:0] r_tx_data_6; |
wire [7:0] r_tx_data_7; |
wire [7:0] r_tx_data_8; |
wire [7:0] r_tx_data_9; |
wire [7:0] r_tx_data_10; |
wire [7:0] r_tx_data_11; |
wire [7:0] r_tx_data_12; |
|
wire send_ack; |
wire bit_err_exc1; |
wire bit_err_exc2; |
wire bit_err_exc3; |
wire bit_err_exc4; |
wire bit_err_exc5; |
wire error_flag_over; |
wire overload_flag_over; |
|
|
assign go_rx_idle = sample_point & sampled_bit & last_bit_of_inter | bus_free & (~node_bus_off); |
assign go_rx_id1 = sample_point & (~sampled_bit) & (rx_idle | last_bit_of_inter); |
assign go_rx_rtr1 = (~bit_de_stuff) & sample_point & rx_id1 & (bit_cnt == 10); |
assign go_rx_ide = (~bit_de_stuff) & sample_point & rx_rtr1; |
assign go_rx_id2 = (~bit_de_stuff) & sample_point & rx_ide & sampled_bit; |
assign go_rx_rtr2 = (~bit_de_stuff) & sample_point & rx_id2 & (bit_cnt == 17); |
assign go_rx_r1 = (~bit_de_stuff) & sample_point & rx_rtr2; |
assign go_rx_r0 = (~bit_de_stuff) & sample_point & (rx_ide & (~sampled_bit) | rx_r1); |
assign go_rx_dlc = (~bit_de_stuff) & sample_point & rx_r0; |
assign go_rx_data = (~bit_de_stuff) & sample_point & rx_dlc & (bit_cnt == 3) & (sampled_bit | (|data_len[2:0])) & (~remote_rq); |
assign go_rx_crc = (~bit_de_stuff) & sample_point & (rx_dlc & (bit_cnt == 3) & ((~sampled_bit) & (~(|data_len[2:0])) | remote_rq) | |
rx_data & (bit_cnt == ((limited_data_len<<3) - 1'b1))); |
assign go_rx_crc_lim = (~bit_de_stuff) & sample_point & rx_crc & (bit_cnt == 14); |
assign go_rx_ack = (~bit_de_stuff) & sample_point & rx_crc_lim; |
assign go_rx_ack_lim = sample_point & rx_ack; |
assign go_rx_eof = sample_point & rx_ack_lim; |
assign go_rx_inter = ((sample_point & rx_eof & (eof_cnt == 6)) | error_frame_ended | overload_frame_ended) & (~overload_needed); |
|
assign go_error_frame = (form_err | stuff_err | bit_err | ack_err | (crc_err & go_rx_eof)); |
assign error_frame_ended = (error_cnt2 == 7) & tx_point; |
assign overload_frame_ended = (overload_cnt2 == 7) & tx_point; |
|
assign go_overload_frame = ( ((sample_point & rx_eof & (eof_cnt == 6)) | error_frame_ended | overload_frame_ended) & overload_needed | |
sample_point & (~sampled_bit) & rx_inter & (bit_cnt < 2) | |
sample_point & (~sampled_bit) & ((error_cnt2 == 7) | (overload_cnt2 == 7)) |
) |
& (~overload_frame_blocked) |
; |
|
|
assign go_crc_enable = hard_sync | go_tx; |
assign rst_crc_enable = go_rx_crc; |
|
assign bit_de_stuff_set = go_rx_id1 & (~go_error_frame); |
assign bit_de_stuff_reset = go_rx_ack | reset_mode | go_error_frame | go_overload_frame; |
|
assign remote_rq = ((~ide) & rtr1) | (ide & rtr2); |
assign limited_data_len = (data_len < 8)? data_len : 4'h8; |
|
assign ack_err = rx_ack & sample_point & sampled_bit & tx_state & (~self_test_mode); |
assign bit_err = (tx_state | error_frame | overload_frame | rx_ack) & sample_point & (tx != sampled_bit) & (~bit_err_exc1) & (~bit_err_exc2) & (~bit_err_exc3) & (~bit_err_exc4) & (~bit_err_exc5); |
assign bit_err_exc1 = tx_state & arbitration_field & tx; |
assign bit_err_exc2 = rx_ack & tx; |
assign bit_err_exc3 = error_frame & node_error_passive & (error_cnt1 < 7); |
assign bit_err_exc4 = (error_frame & (error_cnt1 == 7) & (~enable_error_cnt2)) | (overload_frame & (overload_cnt1 == 7) & (~enable_overload_cnt2)); |
assign bit_err_exc5 = (error_frame & (error_cnt2 == 7)) | (overload_frame & (overload_cnt2 == 7)); |
|
assign arbitration_field = rx_id1 | rx_rtr1 | rx_ide | rx_id2 | rx_rtr2; |
|
assign last_bit_of_inter = rx_inter & (bit_cnt == 2); |
|
|
// Rx idle state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_idle <= 1'b0; |
else if (reset_mode | go_rx_id1 | error_frame) |
rx_idle <=#Tp 1'b0; |
else if (go_rx_idle) |
rx_idle <=#Tp 1'b1; |
end |
|
|
// Rx id1 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_id1 <= 1'b0; |
else if (reset_mode | go_rx_rtr1 | error_frame) |
rx_id1 <=#Tp 1'b0; |
else if (go_rx_id1) |
rx_id1 <=#Tp 1'b1; |
end |
|
|
// Rx rtr1 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_rtr1 <= 1'b0; |
else if (reset_mode | go_rx_ide | error_frame) |
rx_rtr1 <=#Tp 1'b0; |
else if (go_rx_rtr1) |
rx_rtr1 <=#Tp 1'b1; |
end |
|
|
// Rx ide state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_ide <= 1'b0; |
else if (reset_mode | go_rx_r0 | go_rx_id2 | error_frame) |
rx_ide <=#Tp 1'b0; |
else if (go_rx_ide) |
rx_ide <=#Tp 1'b1; |
end |
|
|
// Rx id2 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_id2 <= 1'b0; |
else if (reset_mode | go_rx_rtr2 | error_frame) |
rx_id2 <=#Tp 1'b0; |
else if (go_rx_id2) |
rx_id2 <=#Tp 1'b1; |
end |
|
|
// Rx rtr2 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_rtr2 <= 1'b0; |
else if (reset_mode | go_rx_r1 | error_frame) |
rx_rtr2 <=#Tp 1'b0; |
else if (go_rx_rtr2) |
rx_rtr2 <=#Tp 1'b1; |
end |
|
|
// Rx r0 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_r1 <= 1'b0; |
else if (reset_mode | go_rx_r0 | error_frame) |
rx_r1 <=#Tp 1'b0; |
else if (go_rx_r1) |
rx_r1 <=#Tp 1'b1; |
end |
|
|
// Rx r0 state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_r0 <= 1'b0; |
else if (reset_mode | go_rx_dlc | error_frame) |
rx_r0 <=#Tp 1'b0; |
else if (go_rx_r0) |
rx_r0 <=#Tp 1'b1; |
end |
|
|
// Rx dlc state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_dlc <= 1'b0; |
else if (reset_mode | go_rx_data | go_rx_crc | error_frame) |
rx_dlc <=#Tp 1'b0; |
else if (go_rx_dlc) |
rx_dlc <=#Tp 1'b1; |
end |
|
|
// Rx data state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_data <= 1'b0; |
else if (reset_mode | go_rx_crc | error_frame) |
rx_data <=#Tp 1'b0; |
else if (go_rx_data) |
rx_data <=#Tp 1'b1; |
end |
|
|
// Rx crc state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_crc <= 1'b0; |
else if (reset_mode | go_rx_crc_lim | error_frame) |
rx_crc <=#Tp 1'b0; |
else if (go_rx_crc) |
rx_crc <=#Tp 1'b1; |
end |
|
|
// Rx crc delimiter state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_crc_lim <= 1'b0; |
else if (reset_mode | go_rx_ack | error_frame) |
rx_crc_lim <=#Tp 1'b0; |
else if (go_rx_crc_lim) |
rx_crc_lim <=#Tp 1'b1; |
end |
|
|
// Rx ack state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_ack <= 1'b0; |
else if (reset_mode | go_rx_ack_lim | error_frame) |
rx_ack <=#Tp 1'b0; |
else if (go_rx_ack) |
rx_ack <=#Tp 1'b1; |
end |
|
|
// Rx ack delimiter state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_ack_lim <= 1'b0; |
else if (reset_mode | go_rx_eof | error_frame) |
rx_ack_lim <=#Tp 1'b0; |
else if (go_rx_ack_lim) |
rx_ack_lim <=#Tp 1'b1; |
end |
|
|
// Rx eof state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_eof <= 1'b0; |
else if (go_rx_inter | error_frame | go_overload_frame) |
rx_eof <=#Tp 1'b0; |
else if (go_rx_eof) |
rx_eof <=#Tp 1'b1; |
end |
|
|
|
// Interframe space |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_inter <= 1'b0; |
else if (reset_mode | go_rx_idle | go_rx_id1 | go_overload_frame | go_error_frame) |
rx_inter <=#Tp 1'b0; |
else if (go_rx_inter) |
rx_inter <=#Tp 1'b1; |
end |
|
|
// ID register |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
id <= 0; |
else if (sample_point & (rx_id1 | rx_id2) & (~bit_de_stuff)) |
id <=#Tp {id[27:0], sampled_bit}; |
end |
|
|
// rtr1 bit |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rtr1 <= 0; |
else if (sample_point & rx_rtr1 & (~bit_de_stuff)) |
rtr1 <=#Tp sampled_bit; |
end |
|
|
// rtr2 bit |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rtr2 <= 0; |
else if (sample_point & rx_rtr2 & (~bit_de_stuff)) |
rtr2 <=#Tp sampled_bit; |
end |
|
|
// ide bit |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
ide <= 0; |
else if (sample_point & rx_ide & (~bit_de_stuff)) |
ide <=#Tp sampled_bit; |
end |
|
|
// Data length |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
data_len <= 0; |
else if (sample_point & rx_dlc & (~bit_de_stuff)) |
data_len <=#Tp {data_len[2:0], sampled_bit}; |
end |
|
|
// Data |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tmp_data <= 0; |
else if (sample_point & rx_data & (~bit_de_stuff)) |
tmp_data <=#Tp {tmp_data[6:0], sampled_bit}; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
write_data_to_tmp_fifo <= 0; |
else if (sample_point & rx_data & (~bit_de_stuff) & (&bit_cnt[2:0])) |
write_data_to_tmp_fifo <=#Tp 1'b1; |
else |
write_data_to_tmp_fifo <=#Tp 0; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
byte_cnt <= 0; |
else if (write_data_to_tmp_fifo) |
byte_cnt <=#Tp byte_cnt + 1; |
else if (reset_mode | (sample_point & go_rx_crc_lim)) |
byte_cnt <=#Tp 0; |
end |
|
|
always @ (posedge clk) |
begin |
if (write_data_to_tmp_fifo) |
tmp_fifo[byte_cnt] <=#Tp tmp_data; |
end |
|
|
|
// CRC |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
crc_in <= 0; |
else if (sample_point & rx_crc & (~bit_de_stuff)) |
crc_in <=#Tp {crc_in[13:0], sampled_bit}; |
end |
|
|
// bit_cnt |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_cnt <= 0; |
else if (go_rx_id1 | go_rx_id2 | go_rx_dlc | go_rx_data | go_rx_crc | |
go_rx_ack | go_rx_eof | go_rx_inter | go_error_frame | go_overload_frame) |
bit_cnt <=#Tp 0; |
else if (sample_point & (~bit_de_stuff)) |
bit_cnt <=#Tp bit_cnt + 1'b1; |
end |
|
|
// eof_cnt |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
eof_cnt <= 0; |
else if (sample_point) |
begin |
if (reset_mode | go_rx_inter | go_error_frame | go_overload_frame) |
eof_cnt <=#Tp 0; |
else if (rx_eof) |
eof_cnt <=#Tp eof_cnt + 1'b1; |
end |
end |
|
|
// Enabling bit de-stuffing |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_stuff_cnt_en <= 1'b0; |
else if (bit_de_stuff_set) |
bit_stuff_cnt_en <=#Tp 1'b1; |
else if (bit_de_stuff_reset) |
bit_stuff_cnt_en <=#Tp 1'b0; |
end |
|
|
// bit_stuff_cnt |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_stuff_cnt <= 1; |
else if (bit_de_stuff_reset) |
bit_stuff_cnt <=#Tp 1; |
else if (sample_point & bit_stuff_cnt_en) |
begin |
if (bit_stuff_cnt == 5) |
bit_stuff_cnt <=#Tp 1; |
else if (sampled_bit == sampled_bit_q) |
bit_stuff_cnt <=#Tp bit_stuff_cnt + 1'b1; |
else |
bit_stuff_cnt <=#Tp 1; |
end |
end |
|
|
// Enabling bit de-stuffing for tx |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_stuff_cnt_tx_en <= 1'b0; |
else if (bit_de_stuff_set & transmitting) |
bit_stuff_cnt_tx_en <=#Tp 1'b1; |
else if (bit_de_stuff_reset) |
bit_stuff_cnt_tx_en <=#Tp 1'b0; |
end |
|
|
// bit_stuff_cnt_tx |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_stuff_cnt_tx <= 1; |
else if (bit_de_stuff_reset) |
bit_stuff_cnt_tx <=#Tp 1; |
else if (tx_point_q & bit_stuff_cnt_en) |
begin |
if (bit_stuff_cnt_tx == 5) |
bit_stuff_cnt_tx <=#Tp 1; |
else if (tx == tx_q) |
bit_stuff_cnt_tx <=#Tp bit_stuff_cnt_tx + 1'b1; |
else |
bit_stuff_cnt_tx <=#Tp 1; |
end |
end |
|
|
assign bit_de_stuff = bit_stuff_cnt == 5; |
assign bit_de_stuff_tx = bit_stuff_cnt_tx == 5; |
|
|
|
// stuff_err |
assign stuff_err = sample_point & bit_stuff_cnt_en & bit_de_stuff & (sampled_bit == sampled_bit_q); |
|
|
|
// Generating delayed signals |
always @ (posedge clk) |
begin |
reset_mode_q <=#Tp reset_mode; |
node_bus_off_q <=#Tp node_bus_off; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
crc_enable <= 1'b0; |
else if (go_crc_enable) |
crc_enable <=#Tp 1'b1; |
else if (reset_mode | rst_crc_enable) |
crc_enable <=#Tp 1'b0; |
end |
|
|
// CRC error generation |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
crc_err <= 1'b0; |
else if (go_rx_ack) |
crc_err <=#Tp crc_in != calculated_crc; |
else if (reset_mode | error_frame_ended) |
crc_err <=#Tp 1'b0; |
end |
|
|
// Conditions for form error |
assign form_err = sample_point & ( ((~bit_de_stuff) & rx_ide & sampled_bit & (~rtr1) ) | |
((~bit_de_stuff) & rx_crc_lim & (~sampled_bit) ) | |
( rx_ack_lim & (~sampled_bit) ) | |
((eof_cnt < 6) & rx_eof & (~sampled_bit) & (~tx_state) ) | |
( & rx_eof & (~sampled_bit) & tx_state ) |
); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
ack_err_latched <= 1'b0; |
else if (reset_mode | error_frame_ended | go_overload_frame) |
ack_err_latched <=#Tp 1'b0; |
else if (ack_err) |
ack_err_latched <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bit_err_latched <= 1'b0; |
else if (reset_mode | error_frame_ended | go_overload_frame) |
bit_err_latched <=#Tp 1'b0; |
else if (bit_err) |
bit_err_latched <=#Tp 1'b1; |
end |
|
|
|
// Rule 5 (Fault confinement). |
assign rule5 = (~node_error_passive) & bit_err & (error_frame & (error_cnt1 < 7) | |
overload_frame & (overload_cnt1 < 7) ); |
|
// Rule 3 exception 1 - first part (Fault confinement). |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rule3_exc1_1 <= 1'b0; |
else if (reset_mode | error_flag_over | rule3_exc1_2) |
rule3_exc1_1 <=#Tp 1'b0; |
else if (transmitter & node_error_passive & ack_err) |
rule3_exc1_1 <=#Tp 1'b1; |
end |
|
|
// Rule 3 exception 1 - second part (Fault confinement). |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rule3_exc1_2 <= 1'b0; |
else if (reset_mode | error_flag_over) |
rule3_exc1_2 <=#Tp 1'b0; |
else if (rule3_exc1_1) |
rule3_exc1_2 <=#Tp 1'b1; |
else if ((error_cnt1 < 7) & sample_point & (~sampled_bit)) |
rule3_exc1_2 <=#Tp 1'b0; |
end |
|
|
// Rule 3 exception 2 (Fault confinement). |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rule3_exc2 <= 1'b0; |
else if (reset_mode | error_flag_over) |
rule3_exc2 <=#Tp 1'b0; |
else if (transmitter & stuff_err & arbitration_field & sample_point & tx & (~sampled_bit)) |
rule3_exc2 <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
stuff_err_latched <= 1'b0; |
else if (reset_mode | error_frame_ended | go_overload_frame) |
stuff_err_latched <=#Tp 1'b0; |
else if (stuff_err) |
stuff_err_latched <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
form_err_latched <= 1'b0; |
else if (reset_mode | error_frame_ended | go_overload_frame) |
form_err_latched <=#Tp 1'b0; |
else if (form_err) |
form_err_latched <=#Tp 1'b1; |
end |
|
|
|
// Instantiation of the RX CRC module |
can_crc i_can_crc_rx |
( |
.clk(clk), |
.data(sampled_bit), |
.enable(crc_enable & sample_point & (~bit_de_stuff)), |
.initialize(go_crc_enable), |
.crc(calculated_crc) |
); |
|
|
|
|
assign no_byte0 = rtr1 | (data_len<1); |
assign no_byte1 = rtr1 | (data_len<2); |
|
can_acf i_can_acf |
( |
.clk(clk), |
.rst(rst), |
|
.id(id), |
|
/* Mode register */ |
.reset_mode(reset_mode), |
.acceptance_filter_mode(acceptance_filter_mode), |
|
// Clock Divider register |
.extended_mode(extended_mode), |
|
/* This section is for BASIC and EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_0(acceptance_code_0), |
|
/* Acceptance mask register */ |
.acceptance_mask_0(acceptance_mask_0), |
/* End: This section is for BASIC and EXTENDED mode */ |
|
/* This section is for EXTENDED mode */ |
/* Acceptance code register */ |
.acceptance_code_1(acceptance_code_1), |
.acceptance_code_2(acceptance_code_2), |
.acceptance_code_3(acceptance_code_3), |
|
/* Acceptance mask register */ |
.acceptance_mask_1(acceptance_mask_1), |
.acceptance_mask_2(acceptance_mask_2), |
.acceptance_mask_3(acceptance_mask_3), |
/* End: This section is for EXTENDED mode */ |
|
.go_rx_crc_lim(go_rx_crc_lim), |
.go_rx_inter(go_rx_inter), |
.go_error_frame(go_error_frame), |
|
.data0(tmp_fifo[0]), |
.data1(tmp_fifo[1]), |
.rtr1(rtr1), |
.rtr2(rtr2), |
.ide(ide), |
.no_byte0(no_byte0), |
.no_byte1(no_byte1), |
|
.id_ok(id_ok) |
|
); |
|
|
|
|
assign header_len[2:0] = extended_mode ? (ide? (3'h5) : (3'h3)) : 3'h2; |
assign storing_header = header_cnt < header_len; |
assign limited_data_len_minus1[3:0] = remote_rq? 4'hf : ((data_len < 8)? (data_len -1'b1) : 4'h7); // - 1 because counter counts from 0 |
assign reset_wr_fifo = (data_cnt == (limited_data_len_minus1 + header_len)) | reset_mode; |
|
assign err = form_err | stuff_err | bit_err | ack_err | form_err_latched | stuff_err_latched | bit_err_latched | ack_err_latched | crc_err; |
|
|
|
// Write enable signal for 64-byte rx fifo |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
wr_fifo <= 1'b0; |
else if (reset_wr_fifo) |
wr_fifo <=#Tp 1'b0; |
else if (go_rx_inter & id_ok & (~error_frame_ended) & ((~tx_state) | self_rx_request)) |
wr_fifo <=#Tp 1'b1; |
end |
|
|
// Header counter. Header length depends on the mode of operation and frame format. |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
header_cnt <= 0; |
else if (reset_wr_fifo) |
header_cnt <=#Tp 0; |
else if (wr_fifo & storing_header) |
header_cnt <=#Tp header_cnt + 1; |
end |
|
|
// Data counter. Length of the data is limited to 8 bytes. |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
data_cnt <= 0; |
else if (reset_wr_fifo) |
data_cnt <=#Tp 0; |
else if (wr_fifo) |
data_cnt <=#Tp data_cnt + 1; |
end |
|
|
// Multiplexing data that is stored to 64-byte fifo depends on the mode of operation and frame format |
always @ (extended_mode or ide or data_cnt or header_cnt or header_len or |
storing_header or id or rtr1 or rtr2 or data_len or |
tmp_fifo[0] or tmp_fifo[2] or tmp_fifo[4] or tmp_fifo[6] or |
tmp_fifo[1] or tmp_fifo[3] or tmp_fifo[5] or tmp_fifo[7]) |
begin |
if (storing_header) |
begin |
if (extended_mode) // extended mode |
begin |
if (ide) // extended format |
begin |
case (header_cnt) /* synthesis full_case parallel_case */ |
3'h0 : data_for_fifo <= {1'b1, rtr2, 2'h0, data_len}; |
3'h1 : data_for_fifo <= id[28:21]; |
3'h2 : data_for_fifo <= id[20:13]; |
3'h3 : data_for_fifo <= id[12:5]; |
3'h4 : data_for_fifo <= {id[4:0], 3'h0}; |
endcase |
end |
else // standard format |
begin |
case (header_cnt) /* synthesis full_case parallel_case */ |
3'h0 : data_for_fifo <= {1'b0, rtr1, 2'h0, data_len}; |
3'h1 : data_for_fifo <= id[10:3]; |
3'h2 : data_for_fifo <= {id[2:0], 5'h0}; |
endcase |
end |
end |
else // normal mode |
begin |
case (header_cnt) /* synthesis full_case parallel_case */ |
3'h0 : data_for_fifo <= id[10:3]; |
3'h1 : data_for_fifo <= {id[2:0], rtr1, data_len}; |
endcase |
end |
end |
else |
data_for_fifo <= tmp_fifo[data_cnt-header_len]; |
end |
|
|
|
|
// Instantiation of the RX fifo module |
can_fifo i_can_fifo |
( |
.clk(clk), |
.rst(rst), |
|
.wr(wr_fifo), |
|
.data_in(data_for_fifo), |
.addr(addr), |
.data_out(data_out), |
.fifo_selected(fifo_selected), |
|
.reset_mode(reset_mode), |
.release_buffer(release_buffer), |
.extended_mode(extended_mode), |
.overrun(overrun), |
.info_empty(info_empty), |
.info_cnt(rx_message_counter) |
|
`ifdef CAN_BIST |
, |
.scanb_rst(scanb_rst), |
.scanb_clk(scanb_clk), |
.scanb_si(scanb_si), |
.scanb_so(scanb_so), |
.scanb_en(scanb_en) |
`endif |
); |
|
|
// Transmitting error frame. |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_frame <= 1'b0; |
else if (reset_mode | error_frame_ended | go_overload_frame) |
error_frame <=#Tp 1'b0; |
else if (go_error_frame) |
error_frame <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk) |
begin |
if (sample_point) |
error_frame_q <=#Tp error_frame; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_cnt1 <= 1'b0; |
else if (reset_mode | error_frame_ended | go_error_frame | go_overload_frame) |
error_cnt1 <=#Tp 1'b0; |
else if (error_frame & tx_point & (error_cnt1 < 7)) |
error_cnt1 <=#Tp error_cnt1 + 1'b1; |
end |
|
|
|
assign error_flag_over = ((~node_error_passive) & sample_point & (error_cnt1 == 7) | node_error_passive & sample_point & (passive_cnt == 5)) & (~enable_error_cnt2); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_flag_over_blocked <= 1'b0; |
else if (reset_mode | error_frame_ended | go_error_frame | go_overload_frame) |
error_flag_over_blocked <=#Tp 1'b0; |
else if (error_flag_over) |
error_flag_over_blocked <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
enable_error_cnt2 <= 1'b0; |
else if (reset_mode | error_frame_ended | go_error_frame | go_overload_frame) |
enable_error_cnt2 <=#Tp 1'b0; |
else if (error_frame & (error_flag_over & sampled_bit)) |
enable_error_cnt2 <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_cnt2 <= 0; |
else if (reset_mode | error_frame_ended | go_error_frame | go_overload_frame) |
error_cnt2 <=#Tp 0; |
else if (enable_error_cnt2 & tx_point) |
error_cnt2 <=#Tp error_cnt2 + 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
delayed_dominant_cnt <= 0; |
else if (reset_mode | enable_error_cnt2 | go_error_frame | enable_overload_cnt2 | go_overload_frame) |
delayed_dominant_cnt <=#Tp 0; |
else if (sample_point & (~sampled_bit) & ((error_cnt1 == 7) | (overload_cnt1 == 7))) |
delayed_dominant_cnt <=#Tp delayed_dominant_cnt + 1'b1; |
end |
|
|
// passive_cnt |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
passive_cnt <= 0; |
else if (reset_mode | error_frame_ended | go_error_frame | go_overload_frame) |
passive_cnt <=#Tp 0; |
else if (sample_point & (passive_cnt < 5)) |
begin |
if (error_frame_q & (~enable_error_cnt2) & (sampled_bit == sampled_bit_q)) |
passive_cnt <=#Tp passive_cnt + 1'b1; |
else |
passive_cnt <=#Tp 0; |
end |
end |
|
|
|
// Transmitting overload frame. |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
overload_frame <= 1'b0; |
else if (reset_mode | overload_frame_ended | go_error_frame) |
overload_frame <=#Tp 1'b0; |
else if (go_overload_frame) |
overload_frame <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
overload_cnt1 <= 1'b0; |
else if (reset_mode | overload_frame_ended | go_error_frame | go_overload_frame) |
overload_cnt1 <=#Tp 1'b0; |
else if (overload_frame & tx_point & (overload_cnt1 < 7)) |
overload_cnt1 <=#Tp overload_cnt1 + 1'b1; |
end |
|
|
assign overload_flag_over = sample_point & (overload_cnt1 == 7) & (~enable_overload_cnt2); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
enable_overload_cnt2 <= 1'b0; |
else if (reset_mode | overload_frame_ended | go_error_frame | go_overload_frame) |
enable_overload_cnt2 <=#Tp 1'b0; |
else if (overload_frame & (overload_flag_over & sampled_bit)) |
enable_overload_cnt2 <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
overload_cnt2 <= 0; |
else if (reset_mode | overload_frame_ended | go_error_frame | go_overload_frame) |
overload_cnt2 <=#Tp 0; |
else if (enable_overload_cnt2 & tx_point) |
overload_cnt2 <=#Tp overload_cnt2 + 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
overload_frame_blocked <= 0; |
else if (reset_mode | go_error_frame | go_rx_id1) |
overload_frame_blocked <=#Tp 0; |
else if (go_overload_frame & overload_frame) // This is a second sequential overload |
overload_frame_blocked <=#Tp 1'b1; |
end |
|
|
assign send_ack = (~tx_state) & rx_ack & (~err) & (~listen_only_mode); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tx <= 1'b1; |
else if (reset_mode) // Reset |
tx <=#Tp 1'b1; |
else if (tx_point) |
begin |
if (tx_state) // Transmitting message |
tx <=#Tp ((~bit_de_stuff_tx) & tx_bit) | (bit_de_stuff_tx & (~tx_q)); |
else if (send_ack) // Acknowledge |
tx <=#Tp 1'b0; |
else if (overload_frame) // Transmitting overload frame |
begin |
if (overload_cnt1 < 6) |
tx <=#Tp 1'b0; |
else |
tx <=#Tp 1'b1; |
end |
else if (error_frame) // Transmitting error frame |
begin |
if (error_cnt1 < 6) |
begin |
if (node_error_passive) |
tx <=#Tp 1'b1; |
else |
tx <=#Tp 1'b0; |
end |
else |
tx <=#Tp 1'b1; |
end |
else |
tx <=#Tp 1'b1; |
end |
end |
|
|
|
always @ (posedge clk) |
begin |
if (tx_point) |
tx_q <=#Tp tx & (~go_early_tx_latched); |
end |
|
|
/* Delayed tx point */ |
always @ (posedge clk) |
begin |
tx_point_q <=#Tp tx_point; |
end |
|
|
/* Changing bit order from [7:0] to [0:7] */ |
can_ibo i_ibo_tx_data_0 (.di(tx_data_0), .do(r_tx_data_0)); |
can_ibo i_ibo_tx_data_1 (.di(tx_data_1), .do(r_tx_data_1)); |
can_ibo i_ibo_tx_data_2 (.di(tx_data_2), .do(r_tx_data_2)); |
can_ibo i_ibo_tx_data_3 (.di(tx_data_3), .do(r_tx_data_3)); |
can_ibo i_ibo_tx_data_4 (.di(tx_data_4), .do(r_tx_data_4)); |
can_ibo i_ibo_tx_data_5 (.di(tx_data_5), .do(r_tx_data_5)); |
can_ibo i_ibo_tx_data_6 (.di(tx_data_6), .do(r_tx_data_6)); |
can_ibo i_ibo_tx_data_7 (.di(tx_data_7), .do(r_tx_data_7)); |
can_ibo i_ibo_tx_data_8 (.di(tx_data_8), .do(r_tx_data_8)); |
can_ibo i_ibo_tx_data_9 (.di(tx_data_9), .do(r_tx_data_9)); |
can_ibo i_ibo_tx_data_10 (.di(tx_data_10), .do(r_tx_data_10)); |
can_ibo i_ibo_tx_data_11 (.di(tx_data_11), .do(r_tx_data_11)); |
can_ibo i_ibo_tx_data_12 (.di(tx_data_12), .do(r_tx_data_12)); |
|
/* Changing bit order from [14:0] to [0:14] */ |
can_ibo i_calculated_crc0 (.di(calculated_crc[14:7]), .do(r_calculated_crc[7:0])); |
can_ibo i_calculated_crc1 (.di({calculated_crc[6:0], 1'b0}), .do(r_calculated_crc[15:8])); |
|
|
assign basic_chain = {r_tx_data_1[7:4], 2'h0, r_tx_data_1[3:0], r_tx_data_0[7:0], 1'b0}; |
assign basic_chain_data = {r_tx_data_9, r_tx_data_8, r_tx_data_7, r_tx_data_6, r_tx_data_5, r_tx_data_4, r_tx_data_3, r_tx_data_2}; |
assign extended_chain_std = {r_tx_data_0[7:4], 2'h0, r_tx_data_0[1], r_tx_data_2[2:0], r_tx_data_1[7:0], 1'b0}; |
assign extended_chain_ext = {r_tx_data_0[7:4], 2'h0, r_tx_data_0[1], r_tx_data_4[4:0], r_tx_data_3[7:0], r_tx_data_2[7:3], 1'b1, 1'b1, r_tx_data_2[2:0], r_tx_data_1[7:0], 1'b0}; |
assign extended_chain_data_std = {r_tx_data_10, r_tx_data_9, r_tx_data_8, r_tx_data_7, r_tx_data_6, r_tx_data_5, r_tx_data_4, r_tx_data_3}; |
assign extended_chain_data_ext = {r_tx_data_12, r_tx_data_11, r_tx_data_10, r_tx_data_9, r_tx_data_8, r_tx_data_7, r_tx_data_6, r_tx_data_5}; |
|
always @ (extended_mode or rx_data or tx_pointer or extended_chain_data_std or extended_chain_data_ext or rx_crc or r_calculated_crc or |
r_tx_data_0 or extended_chain_ext or extended_chain_std or basic_chain_data or basic_chain or |
finish_msg) |
begin |
if (extended_mode) |
begin |
if (rx_data) // data stage |
if (r_tx_data_0[0]) // Extended frame |
tx_bit = extended_chain_data_ext[tx_pointer]; |
else |
tx_bit = extended_chain_data_std[tx_pointer]; |
else if (rx_crc) |
tx_bit = r_calculated_crc[tx_pointer]; |
else if (finish_msg) |
tx_bit = 1'b1; |
else |
begin |
if (r_tx_data_0[0]) // Extended frame |
tx_bit = extended_chain_ext[tx_pointer]; |
else |
tx_bit = extended_chain_std[tx_pointer]; |
end |
end |
else // Basic mode |
begin |
if (rx_data) // data stage |
tx_bit = basic_chain_data[tx_pointer]; |
else if (rx_crc) |
tx_bit = r_calculated_crc[tx_pointer]; |
else if (finish_msg) |
tx_bit = 1'b1; |
else |
tx_bit = basic_chain[tx_pointer]; |
end |
end |
|
assign rst_tx_pointer = ((~bit_de_stuff_tx) & tx_point & (~rx_data) & extended_mode & r_tx_data_0[0] & tx_pointer == 38 ) | // arbitration + control for extended format |
((~bit_de_stuff_tx) & tx_point & (~rx_data) & extended_mode & (~r_tx_data_0[0]) & tx_pointer == 18 ) | // arbitration + control for extended format |
((~bit_de_stuff_tx) & tx_point & (~rx_data) & (~extended_mode) & tx_pointer == 18 ) | // arbitration + control for standard format |
((~bit_de_stuff_tx) & tx_point & rx_data & extended_mode & tx_pointer == (8 * tx_data_0[3:0] - 1)) | // data |
((~bit_de_stuff_tx) & tx_point & rx_data & (~extended_mode) & tx_pointer == (8 * tx_data_1[3:0] - 1)) | // data |
( tx_point & rx_crc_lim ) | // crc |
(go_rx_idle ) | // at the end |
(reset_mode ) | |
(overload_frame ) | |
(error_frame ) ; |
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tx_pointer <= 'h0; |
else if (rst_tx_pointer) |
tx_pointer <=#Tp 'h0; |
else if (go_early_tx | (tx_point & tx_state & (~bit_de_stuff_tx))) |
tx_pointer <=#Tp tx_pointer + 1'b1; |
end |
|
|
assign tx_successful = transmitter & go_rx_inter & ((~error_frame_ended) & (~overload_frame_ended) & (~arbitration_lost) | single_shot_transmission); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
need_to_tx <= 1'b0; |
else if (tx_successful | reset_mode | (abort_tx & (~transmitting))) |
need_to_tx <=#Tp 1'h0; |
else if (tx_request & sample_point) |
need_to_tx <=#Tp 1'b1; |
end |
|
|
|
assign go_early_tx = (~listen_only_mode) & need_to_tx & (~tx_state) & (~suspend) & sample_point & (~sampled_bit) & (rx_idle | last_bit_of_inter); |
assign go_tx = (~listen_only_mode) & need_to_tx & (~tx_state) & (~suspend) & (go_early_tx | rx_idle); |
|
|
// go_early_tx latched (for proper bit_de_stuff generation) |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
go_early_tx_latched <= 1'b0; |
else if (tx_point_q) |
go_early_tx_latched <=#Tp 1'b0; |
else if (go_early_tx) |
go_early_tx_latched <=#Tp 1'b1; |
end |
|
|
|
// Tx state |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tx_state <= 1'b0; |
else if (reset_mode | go_rx_inter | error_frame | arbitration_lost) |
tx_state <=#Tp 1'b0; |
else if (go_tx) |
tx_state <=#Tp 1'b1; |
end |
|
|
|
// Node is a transmitter |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
transmitter <= 1'b0; |
else if (go_tx) |
transmitter <=#Tp 1'b1; |
else if (reset_mode | go_rx_inter) |
transmitter <=#Tp 1'b0; |
end |
|
|
|
// Signal "transmitting" signals that the core is a transmitting (message, error frame or overload frame). No synchronization is done meanwhile. |
// Node might be both transmitter or receiver (sending error or overload frame) |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
transmitting <= 1'b0; |
else if (go_error_frame | go_overload_frame | go_tx) |
transmitting <=#Tp 1'b1; |
else if (reset_mode | go_rx_idle | (go_rx_id1 & (~tx_state)) | (arbitration_lost & tx_state)) |
transmitting <=#Tp 1'b0; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
suspend <= 0; |
else if (reset_mode | (sample_point & (susp_cnt == 7))) |
suspend <=#Tp 0; |
else if (go_rx_inter & transmitter & node_error_passive) |
suspend <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
susp_cnt_en <= 0; |
else if (reset_mode | (sample_point & (susp_cnt == 7))) |
susp_cnt_en <=#Tp 0; |
else if (suspend & sample_point & last_bit_of_inter) |
susp_cnt_en <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
susp_cnt <= 0; |
else if (reset_mode | (sample_point & (susp_cnt == 7))) |
susp_cnt <=#Tp 0; |
else if (susp_cnt_en & sample_point) |
susp_cnt <=#Tp susp_cnt + 1'b1; |
end |
|
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
finish_msg <= 1'b0; |
else if (go_rx_idle | go_rx_id1 | error_frame | reset_mode) |
finish_msg <=#Tp 1'b0; |
else if (go_rx_crc_lim) |
finish_msg <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
arbitration_lost <= 1'b0; |
else if (go_rx_idle | error_frame | reset_mode) |
arbitration_lost <=#Tp 1'b0; |
else if (tx_state & sample_point & tx & arbitration_field) |
arbitration_lost <=#Tp (~sampled_bit); |
end |
|
|
always @ (posedge clk) |
begin |
arbitration_lost_q <=#Tp arbitration_lost; |
end |
|
|
assign set_arbitration_lost_irq = arbitration_lost & (~arbitration_lost_q) & (~arbitration_blocked); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
arbitration_cnt_en <= 1'b0; |
else if (arbitration_blocked) |
arbitration_cnt_en <=#Tp 1'b0; |
else if (rx_id1 & sample_point & (~arbitration_blocked)) |
arbitration_cnt_en <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
arbitration_blocked <= 1'b0; |
else if (read_arbitration_lost_capture_reg) |
arbitration_blocked <=#Tp 1'b0; |
else if (set_arbitration_lost_irq) |
arbitration_blocked <=#Tp 1'b1; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
arbitration_lost_capture <= 5'h0; |
else if (read_arbitration_lost_capture_reg) |
arbitration_lost_capture <=#Tp 5'h0; |
else if (sample_point & (~arbitration_blocked) & arbitration_cnt_en & (~bit_de_stuff)) |
arbitration_lost_capture <=#Tp arbitration_lost_capture + 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_err_cnt <= 'h0; |
else if (we_rx_err_cnt & (~node_bus_off)) |
rx_err_cnt <=#Tp {1'b0, data_in}; |
else if (set_reset_mode) |
rx_err_cnt <=#Tp 'h0; |
else |
begin |
if (~listen_only_mode) |
begin |
if ((~transmitter) & go_rx_ack_lim & (~err) & (rx_err_cnt > 0)) |
begin |
if (rx_err_cnt > 127) |
rx_err_cnt <=#Tp 127; |
else |
rx_err_cnt <=#Tp rx_err_cnt - 1'b1; |
end |
else if ((rx_err_cnt < 248) & (~transmitter)) // 248 + 8 = 256 |
begin |
if (go_error_frame & (~rule5)) // 1 (rule 5 is just the opposite then rule 1 exception |
rx_err_cnt <=#Tp rx_err_cnt + 1'b1; |
else if ( (error_frame & sample_point & (~sampled_bit) & (error_cnt1 == 7) & (~rx_err_cnt_blocked) ) | // 2 |
(go_error_frame & rule5 ) | // 5 |
(error_frame & sample_point & (~sampled_bit) & (delayed_dominant_cnt == 7) ) // 6 |
) |
rx_err_cnt <=#Tp rx_err_cnt + 4'h8; |
end |
end |
end |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
tx_err_cnt <= 'h0; |
else if (we_tx_err_cnt) |
tx_err_cnt <=#Tp {1'b0, data_in}; |
else |
begin |
if (set_reset_mode) |
tx_err_cnt <=#Tp 127; |
else if ((tx_err_cnt > 0) & (tx_successful | bus_free)) |
tx_err_cnt <=#Tp tx_err_cnt - 1'h1; |
else if (transmitter) |
begin |
if ( (sample_point & (~sampled_bit) & (delayed_dominant_cnt == 7) ) | // 6 |
(go_error_frame & rule5 ) | // 4 (rule 5 is the same as rule 4) |
(error_flag_over & (~error_flag_over_blocked) & (~rule3_exc1_2) & (~rule3_exc2) ) // 3 |
) |
tx_err_cnt <=#Tp tx_err_cnt + 4'h8; |
end |
end |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rx_err_cnt_blocked <= 1'b0; |
else if (reset_mode | error_frame_ended) |
rx_err_cnt_blocked <=#Tp 1'b0; |
else if (sample_point & (error_cnt1 == 7)) |
rx_err_cnt_blocked <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
node_error_passive <= 1'b0; |
else if ((rx_err_cnt < 128) & (tx_err_cnt < 128) & error_frame_ended) |
node_error_passive <=#Tp 1'b0; |
else if (((rx_err_cnt >= 128) | (tx_err_cnt >= 128)) & (error_frame_ended | go_error_frame | (~reset_mode) & reset_mode_q) & (~node_bus_off)) |
node_error_passive <=#Tp 1'b1; |
end |
|
|
assign node_error_active = ~(node_error_passive | node_bus_off); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
node_bus_off <= 1'b0; |
else if ((rx_err_cnt == 0) & (tx_err_cnt == 0) & (~reset_mode) | (we_tx_err_cnt & (data_in < 255))) |
node_bus_off <=#Tp 1'b0; |
else if ((tx_err_cnt >= 256) | (we_tx_err_cnt & (data_in == 255))) |
node_bus_off <=#Tp 1'b1; |
end |
|
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bus_free_cnt <= 0; |
else if (reset_mode) |
bus_free_cnt <=#Tp 0; |
else if (sample_point) |
begin |
if (sampled_bit & bus_free_cnt_en & (bus_free_cnt < 10)) |
bus_free_cnt <=#Tp bus_free_cnt + 1'b1; |
else |
bus_free_cnt <=#Tp 0; |
end |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bus_free_cnt_en <= 1'b0; |
else if ((~reset_mode) & reset_mode_q | node_bus_off_q & (~reset_mode)) |
bus_free_cnt_en <=#Tp 1'b1; |
else if (sample_point & (bus_free_cnt==10) & (~node_bus_off)) |
bus_free_cnt_en <=#Tp 1'b0; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
bus_free <= 1'b0; |
else if (sample_point & sampled_bit & (bus_free_cnt==10)) |
bus_free <=#Tp 1'b1; |
else |
bus_free <=#Tp 1'b0; |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
waiting_for_bus_free <= 1'b1; |
else if (bus_free & (~node_bus_off)) |
waiting_for_bus_free <=#Tp 1'b0; |
else if ((~reset_mode) & reset_mode_q | node_bus_off_q & (~reset_mode)) |
waiting_for_bus_free <=#Tp 1'b1; |
end |
|
|
assign tx_oen = node_bus_off; |
|
assign set_reset_mode = node_bus_off & (~node_bus_off_q); |
assign error_status = (~reset_mode) & extended_mode? ((rx_err_cnt >= error_warning_limit) | (tx_err_cnt >= error_warning_limit)) : |
((rx_err_cnt >= 96) | (tx_err_cnt >= 96)) ; |
|
assign transmit_status = transmitting | (extended_mode & waiting_for_bus_free); |
assign receive_status = (~rx_idle) & (~transmitting) | (extended_mode & waiting_for_bus_free); |
|
|
/* Error code capture register */ |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_capture_code <= 8'h0; |
else if (read_error_code_capture_reg) |
error_capture_code <=#Tp 8'h0; |
else if (set_bus_error_irq) |
error_capture_code <=#Tp {error_capture_code_type[7:6], error_capture_code_direction, error_capture_code_segment[4:0]}; |
end |
|
|
|
assign error_capture_code_segment[0] = rx_idle | rx_ide | (rx_id2 & (bit_cnt<13)) | rx_r1 | rx_r0 | rx_dlc | rx_ack | rx_ack_lim | error_frame & node_error_active; |
assign error_capture_code_segment[1] = rx_idle | rx_id1 | rx_id2 | rx_dlc | rx_data | rx_ack_lim | rx_eof | rx_inter | error_frame & node_error_passive; |
assign error_capture_code_segment[2] = (rx_id1 & (bit_cnt>7)) | rx_rtr1 | rx_ide | rx_id2 | rx_rtr2 | rx_r1 | error_frame & node_error_passive | overload_frame; |
assign error_capture_code_segment[3] = (rx_id2 & (bit_cnt>4)) | rx_rtr2 | rx_r1 | rx_r0 | rx_dlc | rx_data | rx_crc | rx_crc_lim | rx_ack | rx_ack_lim | rx_eof | overload_frame; |
assign error_capture_code_segment[4] = rx_crc_lim | rx_ack | rx_ack_lim | rx_eof | rx_inter | error_frame | overload_frame; |
assign error_capture_code_direction = ~transmitting; |
|
|
always @ (bit_err or form_err or stuff_err) |
begin |
if (bit_err) |
error_capture_code_type[7:6] <= 2'b00; |
else if (form_err) |
error_capture_code_type[7:6] <= 2'b01; |
else if (stuff_err) |
error_capture_code_type[7:6] <= 2'b10; |
else |
error_capture_code_type[7:6] <= 2'b11; |
end |
|
|
assign set_bus_error_irq = go_error_frame & (~error_capture_code_blocked); |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
error_capture_code_blocked <= 1'b0; |
else if (read_error_code_capture_reg) |
error_capture_code_blocked <=#Tp 1'b0; |
else if (set_bus_error_irq) |
error_capture_code_blocked <=#Tp 1'b1; |
end |
|
|
endmodule |
/verilog/can_fifo.v
0,0 → 1,602
////////////////////////////////////////////////////////////////////// |
//// //// |
//// can_fifo.v //// |
//// //// |
//// //// |
//// This file is part of the CAN Protocol Controller //// |
//// http://www.opencores.org/projects/can/ //// |
//// //// |
//// //// |
//// Author(s): //// |
//// Igor Mohor //// |
//// igorm@opencores.org //// |
//// //// |
//// //// |
//// All additional information is available in the README.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002, 2003 Authors //// |
//// //// |
//// This source file may be used and distributed without //// |
//// restriction provided that this copyright statement is not //// |
//// removed from the file and that any derivative work contains //// |
//// the original copyright notice and the associated disclaimer. //// |
//// //// |
//// This source file is free software; you can redistribute it //// |
//// and/or modify it under the terms of the GNU Lesser General //// |
//// Public License as published by the Free Software Foundation; //// |
//// either version 2.1 of the License, or (at your option) any //// |
//// later version. //// |
//// //// |
//// This source is distributed in the hope that it will be //// |
//// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
//// PURPOSE. See the GNU Lesser General Public License for more //// |
//// details. //// |
//// //// |
//// You should have received a copy of the GNU Lesser General //// |
//// Public License along with this source; if not, download it //// |
//// from http://www.opencores.org/lgpl.shtml //// |
//// //// |
//// The CAN protocol is developed by Robert Bosch GmbH and //// |
//// protected by patents. Anybody who wants to implement this //// |
//// CAN IP core on silicon has to obtain a CAN protocol license //// |
//// from Bosch. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
// |
// CVS Revision History |
// |
// $Log: not supported by cvs2svn $ |
// Revision 1.18 2003/06/27 22:14:23 simons |
// Overrun fifo implemented with FFs, because it is not possible to create such a memory. |
// |
// Revision 1.17 2003/06/27 20:56:15 simons |
// Virtual silicon ram instances added. |
// |
// Revision 1.16 2003/06/18 23:03:44 mohor |
// Typo fixed. |
// |
// Revision 1.15 2003/06/11 09:37:05 mohor |
// overrun and length_info fifos are initialized at the end of reset. |
// |
// Revision 1.14 2003/03/05 15:02:30 mohor |
// Xilinx RAM added. |
// |
// Revision 1.13 2003/03/01 22:53:33 mohor |
// Actel APA ram supported. |
// |
// Revision 1.12 2003/02/19 14:44:03 mohor |
// CAN core finished. Host interface added. Registers finished. |
// Synchronization to the wishbone finished. |
// |
// Revision 1.11 2003/02/14 20:17:01 mohor |
// Several registers added. Not finished, yet. |
// |
// Revision 1.10 2003/02/11 00:56:06 mohor |
// Wishbone interface added. |
// |
// Revision 1.9 2003/02/09 02:24:33 mohor |
// Bosch license warning added. Error counters finished. Overload frames |
// still need to be fixed. |
// |
// Revision 1.8 2003/01/31 01:13:38 mohor |
// backup. |
// |
// Revision 1.7 2003/01/17 17:44:31 mohor |
// Fifo corrected to be synthesizable. |
// |
// Revision 1.6 2003/01/15 13:16:47 mohor |
// When a frame with "remote request" is received, no data is stored |
// to fifo, just the frame information (identifier, ...). Data length |
// that is stored is the received data length and not the actual data |
// length that is stored to fifo. |
// |
// Revision 1.5 2003/01/14 17:25:09 mohor |
// Addresses corrected to decimal values (previously hex). |
// |
// Revision 1.4 2003/01/14 12:19:35 mohor |
// rx_fifo is now working. |
// |
// Revision 1.3 2003/01/09 21:54:45 mohor |
// rx fifo added. Not 100 % verified, yet. |
// |
// Revision 1.2 2003/01/09 14:46:58 mohor |
// Temporary files (backup). |
// |
// Revision 1.1 2003/01/08 02:10:55 mohor |
// Acceptance filter added. |
// |
// |
// |
// |
|
// synopsys translate_off |
`include "timescale.v" |
// synopsys translate_on |
`include "can_defines.v" |
|
module can_fifo |
( |
clk, |
rst, |
|
wr, |
|
data_in, |
addr, |
data_out, |
fifo_selected, |
|
reset_mode, |
release_buffer, |
extended_mode, |
overrun, |
info_empty, |
info_cnt |
|
`ifdef CAN_BIST |
, |
scanb_rst, |
scanb_clk, |
scanb_si, |
scanb_so, |
scanb_en |
`endif |
); |
|
parameter Tp = 1; |
|
input clk; |
input rst; |
input wr; |
input [7:0] data_in; |
input [7:0] addr; |
input reset_mode; |
input release_buffer; |
input extended_mode; |
input fifo_selected; |
|
output [7:0] data_out; |
output overrun; |
output info_empty; |
output [6:0] info_cnt; |
|
`ifdef CAN_BIST |
input scanb_rst; |
input scanb_clk; |
input scanb_si; |
output scanb_so; |
input scanb_en; |
wire scanb_s_0; |
`endif |
|
`ifdef ACTEL_APA_RAM |
`else |
`ifdef XILINX_RAM |
`else |
`ifdef VIRTUALSILICON_RAM |
reg overrun_info[0:63]; |
`else |
reg [7:0] fifo [0:63]; |
reg [3:0] length_fifo[0:63]; |
reg overrun_info[0:63]; |
`endif |
`endif |
`endif |
|
reg [5:0] rd_pointer; |
reg [5:0] wr_pointer; |
reg [5:0] read_address; |
reg [5:0] wr_info_pointer; |
reg [5:0] rd_info_pointer; |
reg wr_q; |
reg [3:0] len_cnt; |
reg [6:0] fifo_cnt; |
reg [6:0] info_cnt; |
reg latch_overrun; |
reg initialize_memories; |
|
wire [3:0] length_info; |
wire write_length_info; |
wire fifo_empty; |
wire fifo_full; |
wire info_full; |
|
assign write_length_info = (~wr) & wr_q; |
|
// Delayed write signal |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
wr_q <= 0; |
else if (reset_mode) |
wr_q <=#Tp 0; |
else |
wr_q <=#Tp wr; |
end |
|
|
// length counter |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
len_cnt <= 0; |
else if (reset_mode | write_length_info) |
len_cnt <=#Tp 1'b0; |
else if (wr & (~fifo_full)) |
len_cnt <=#Tp len_cnt + 1'b1; |
end |
|
|
// wr_info_pointer |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
wr_info_pointer <= 0; |
else if (write_length_info & (~info_full) | initialize_memories) |
wr_info_pointer <=#Tp wr_info_pointer + 1'b1; |
else if (reset_mode) |
wr_info_pointer <=#Tp 0; |
end |
|
|
|
// rd_info_pointer |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rd_info_pointer <= 0; |
else if (reset_mode) |
rd_info_pointer <=#Tp 0; |
else if (release_buffer & (~fifo_empty)) |
rd_info_pointer <=#Tp rd_info_pointer + 1'b1; |
end |
|
|
// rd_pointer |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
rd_pointer <= 0; |
else if (release_buffer & (~fifo_empty)) |
rd_pointer <=#Tp rd_pointer + length_info; |
else if (reset_mode) |
rd_pointer <=#Tp 0; |
end |
|
|
// wr_pointer |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
wr_pointer <= 0; |
else if (wr & (~fifo_full)) |
wr_pointer <=#Tp wr_pointer + 1'b1; |
else if (reset_mode) |
wr_pointer <=#Tp 0; |
end |
|
|
// latch_overrun |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
latch_overrun <= 0; |
else if (reset_mode | write_length_info) |
latch_overrun <=#Tp 0; |
else if (wr & fifo_full) |
latch_overrun <=#Tp 1'b1; |
end |
|
|
// Counting data in fifo |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
fifo_cnt <= 0; |
else if (wr & (~release_buffer) & (~fifo_full)) |
fifo_cnt <=#Tp fifo_cnt + 1'b1; |
else if ((~wr) & release_buffer & (~fifo_empty)) |
fifo_cnt <=#Tp fifo_cnt - length_info; |
else if (wr & release_buffer & (~fifo_full) & (~fifo_empty)) |
fifo_cnt <=#Tp fifo_cnt - length_info + 1'b1; |
else if (reset_mode) |
fifo_cnt <=#Tp 0; |
end |
|
assign fifo_full = fifo_cnt == 64; |
assign fifo_empty = fifo_cnt == 0; |
|
|
// Counting data in length_fifo and overrun_info fifo |
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
info_cnt <= 0; |
else if (write_length_info ^ release_buffer) |
begin |
if (release_buffer & (~info_empty)) |
info_cnt <=#Tp info_cnt - 1'b1; |
else if (write_length_info & (~info_full)) |
info_cnt <=#Tp info_cnt + 1'b1; |
end |
end |
|
assign info_full = info_cnt == 64; |
assign info_empty = info_cnt == 0; |
|
|
// Selecting which address will be used for reading data from rx fifo |
always @ (extended_mode or rd_pointer or addr) |
begin |
if (extended_mode) // extended mode |
begin |
read_address <= rd_pointer + (addr - 8'd16); |
end |
else // normal mode |
begin |
read_address <= rd_pointer + (addr - 8'd20); |
end |
end |
|
|
always @ (posedge clk or posedge rst) |
begin |
if (rst) |
initialize_memories <= 1; |
else if (&wr_info_pointer) |
initialize_memories <=#Tp 1'b0; |
end |
|
|
`ifdef ACTEL_APA_RAM |
actel_ram_64x8_sync fifo |
( |
.DO (data_out), |
.RCLOCK (clk), |
.WCLOCK (clk), |
.DI (data_in), |
.PO (), // parity not used |
.WRB (~(wr & (~fifo_full))), |
.RDB (~fifo_selected), |
.WADDR (wr_pointer), |
.RADDR (read_address) |
); |
|
|
actel_ram_64x4_sync info_fifo |
( |
.DO (length_info), |
.RCLOCK (clk), |
.WCLOCK (clk), |
.DI (len_cnt & {4{~initialize_memories}}), |
.PO (), // parity not used |
.WRB (~(write_length_info & (~info_full) | initialize_memories)), |
.RDB (1'b0), // always enabled |
.WADDR (wr_info_pointer), |
.RADDR (rd_info_pointer) |
); |
|
|
actel_ram_64x1_sync overrun_fifo |
( |
.DO (overrun), |
.RCLOCK (clk), |
.WCLOCK (clk), |
.DI ((latch_overrun | (wr & fifo_full)) & (~initialize_memories)), |
.PO (), // parity not used |
.WRB (~(write_length_info & (~info_full) | initialize_memories)), |
.RDB (1'b0), // always enabled |
.WADDR (wr_info_pointer), |
.RADDR (rd_info_pointer) |
); |
`else |
`ifdef XILINX_RAM |
|
/* |
ram_64x8_sync fifo |
( |
.addra(wr_pointer), |
.addrb(read_address), |
.clka(clk), |
.clkb(clk), |
.dina(data_in), |
.doutb(data_out), |
.wea(wr & (~fifo_full)) |
); |
*/ |
|
RAMB4_S8_S8 fifo |
( |
.DOA(), |
.DOB(data_out), |
.ADDRA({3'h0, wr_pointer}), |
.CLKA(clk), |
.DIA(data_in), |
.ENA(1'b1), |
.RSTA(1'b0), |
.WEA(wr & (~fifo_full)), |
.ADDRB({3'h0, read_address}), |
.CLKB(clk), |
.DIB(8'h0), |
.ENB(1'b1), |
.RSTB(1'b0), |
.WEB(1'b0) |
); |
|
|
|
/* |
ram_64x4_sync info_fifo |
( |
.addra(wr_info_pointer), |
.addrb(rd_info_pointer), |
.clka(clk), |
.clkb(clk), |
.dina(len_cnt), |
.doutb(length_info), |
.wea(write_length_info & (~info_full)) |
); |
*/ |
RAMB4_S4_S4 info_fifo |
( |
.DOA(), |
.DOB(length_info), |
.ADDRA({4'h0, wr_info_pointer}), |
.CLKA(clk), |
.DIA(len_cnt & {4{~initialize_memories}}), |
.ENA(1'b1), |
.RSTA(1'b0), |
.WEA(write_length_info & (~info_full) | initialize_memories), |
.ADDRB({4'h0, rd_info_pointer}), |
.CLKB(clk), |
.DIB(4'h0), |
.ENB(1'b1), |
.RSTB(1'b0), |
.WEB(1'b0) |
); |
|
/* |
ram_64x1_sync overrun_fifo |
( |
.addra(wr_info_pointer), |
.addrb(rd_info_pointer), |
.clka(clk), |
.clkb(clk), |
.dina(latch_overrun | (wr & fifo_full)), |
.doutb(overrun), |
.wea(write_length_info & (~info_full)) |
); |
*/ |
|
|
RAMB4_S1_S1 overrun_fifo |
( |
.DOA(), |
.DOB(overrun), |
.ADDRA({6'h0, wr_info_pointer}), |
.CLKA(clk), |
.DIA((latch_overrun | (wr & fifo_full)) & (~initialize_memories)), |
.ENA(1'b1), |
.RSTA(1'b0), |
.WEA(write_length_info & (~info_full) | initialize_memories), |
.ADDRB({6'h0, rd_info_pointer}), |
.CLKB(clk), |
.DIB(1'h0), |
.ENB(1'b1), |
.RSTB(1'b0), |
.WEB(1'b0) |
); |
|
|
`else |
`ifdef VIRTUALSILICON_RAM |
|
`ifdef CAN_BIST |
vs_hdtp_64x8_bist fifo |
`else |
vs_hdtp_64x8 fifo |
`endif |
( |
.RCK (clk), |
.WCK (clk), |
.RADR (read_address), |
.WADR (wr_pointer), |
.DI (data_in), |
.DOUT (data_out), |
.REN (~fifo_selected), |
.WEN (~(wr & (~fifo_full))) |
`ifdef CAN_BIST |
, |
// debug chain signals |
.scanb_rst (scanb_rst), |
.scanb_clk (scanb_clk), |
.scanb_si (scanb_si), |
.scanb_so (scanb_s_0), |
.scanb_en (scanb_en) |
`endif |
); |
|
`ifdef CAN_BIST |
vs_hdtp_64x4_bist info_fifo |
`else |
vs_hdtp_64x4 info_fifo |
`endif |
( |
.RCK (clk), |
.WCK (clk), |
.RADR (rd_info_pointer), |
.WADR (wr_info_pointer), |
.DI (len_cnt & {4{~initialize_memories}}), |
.DOUT (length_info), |
.REN (1'b0), |
.WEN (~(write_length_info & (~info_full) | initialize_memories)) |
`ifdef CAN_BIST |
, |
// debug chain signals |
.scanb_rst (scanb_rst), |
.scanb_clk (scanb_clk), |
.scanb_si (scanb_s_0), |
.scanb_so (scanb_so), |
.scanb_en (scanb_en) |
`endif |
); |
|
// overrun_info |
always @ (posedge clk) |
begin |
if (write_length_info & (~info_full) | initialize_memories) |
overrun_info[wr_info_pointer] <=#Tp (latch_overrun | (wr & fifo_full)) & (~initialize_memories); |
end |
|
|
// reading overrun |
assign overrun = overrun_info[rd_info_pointer]; |
|
`else |
// writing data to fifo |
always @ (posedge clk) |
begin |
if (wr & (~fifo_full)) |
fifo[wr_pointer] <=#Tp data_in; |
end |
|
// reading from fifo |
assign data_out = fifo[read_address]; |
|
|
// writing length_fifo |
always @ (posedge clk) |
begin |
if (write_length_info & (~info_full) | initialize_memories) |
length_fifo[wr_info_pointer] <=#Tp len_cnt & {4{~initialize_memories}}; |
end |
|
|
// reading length_fifo |
assign length_info = length_fifo[rd_info_pointer]; |
|
// overrun_info |
always @ (posedge clk) |
begin |
if (write_length_info & (~info_full) | initialize_memories) |
overrun_info[wr_info_pointer] <=#Tp (latch_overrun | (wr & fifo_full)) & (~initialize_memories); |
end |
|
|
// reading overrun |
assign overrun = overrun_info[rd_info_pointer]; |
|
|
`endif |
`endif |
`endif |
|
|
|
|
|
endmodule |
/verilog/can_defines.v
0,0 → 1,97
////////////////////////////////////////////////////////////////////// |
//// //// |
//// can_defines.v //// |
//// //// |
//// //// |
//// This file is part of the CAN Protocol Controller //// |
//// http://www.opencores.org/projects/can/ //// |
//// //// |
//// //// |
//// Author(s): //// |
//// Igor Mohor //// |
//// igorm@opencores.org //// |
//// //// |
//// //// |
//// All additional information is available in the README.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002, 2003 Authors //// |
//// //// |
//// This source file may be used and distributed without //// |
//// restriction provided that this copyright statement is not //// |
//// removed from the file and that any derivative work contains //// |
//// the original copyright notice and the associated disclaimer. //// |
//// //// |
//// This source file is free software; you can redistribute it //// |
//// and/or modify it under the terms of the GNU Lesser General //// |
//// Public License as published by the Free Software Foundation; //// |
//// either version 2.1 of the License, or (at your option) any //// |
//// later version. //// |
//// //// |
//// This source is distributed in the hope that it will be //// |
//// useful, but WITHOUT ANY WARRANTY; without even the implied //// |
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR //// |
//// PURPOSE. See the GNU Lesser General Public License for more //// |
//// details. //// |
//// //// |
//// You should have received a copy of the GNU Lesser General //// |
//// Public License along with this source; if not, download it //// |
//// from http://www.opencores.org/lgpl.shtml //// |
//// //// |
//// The CAN protocol is developed by Robert Bosch GmbH and //// |
//// protected by patents. Anybody who wants to implement this //// |
//// CAN IP core on silicon has to obtain a CAN protocol license //// |
//// from Bosch. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
// |
// CVS Revision History |
// |
// $Log: not supported by cvs2svn $ |
// Revision 1.8 2003/06/09 11:32:36 mohor |
// Ports added for the CAN_BIST. |
// |
// Revision 1.7 2003/03/20 16:51:55 mohor |
// *** empty log message *** |
// |
// Revision 1.6 2003/03/12 04:19:13 mohor |
// 8051 interface added (besides WISHBONE interface). Selection is made in |
// can_defines.v file. |
// |
// Revision 1.5 2003/03/05 15:03:20 mohor |
// Xilinx RAM added. |
// |
// Revision 1.4 2003/03/01 22:52:47 mohor |
// Actel APA ram supported. |
// |
// Revision 1.3 2003/02/09 02:24:33 mohor |
// Bosch license warning added. Error counters finished. Overload frames |
// still need to be fixed. |
// |
// Revision 1.2 2002/12/27 00:12:52 mohor |
// Header changed, testbench improved to send a frame (crc still missing). |
// |
// Revision 1.1.1.1 2002/12/20 16:39:21 mohor |
// Initial |
// |
// |
// |
|
|
// Uncomment following line if you want to use WISHBONE interface. Otherwise |
// 8051 interface is used. |
// `define CAN_WISHBONE_IF |
|
// Uncomment following line if you want to use CAN in Actel APA devices (embedded memory used) |
`define ACTEL_APA_RAM |
|
// Uncomment following line if you want to use CAN in Xilinx devices (embedded memory used) |
// `define XILINX_RAM |
|
// Uncomment following line if you want to use CAN in Xilinx devices (embedded memory used) |
// `define VIRTUALSILICON_RAM |
|
// Uncomment the following line when RAM BIST is needed (ASIC implementation) |
//`define CAN_BIST // Bist (for ASIC implementation) |
verilog/can_defines.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_registers.v
===================================================================
--- verilog/can_registers.v (nonexistent)
+++ verilog/can_registers.v (revision 161)
@@ -0,0 +1,1195 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_registers.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.26 2003/06/22 01:33:14 mohor
+// clkout is clk/2 after the reset.
+//
+// Revision 1.25 2003/06/21 12:16:30 mohor
+// paralel_case and full_case compiler directives added to case statements.
+//
+// Revision 1.24 2003/06/09 11:22:54 mohor
+// data_out is already registered in the can_top.v file.
+//
+// Revision 1.23 2003/04/15 15:31:24 mohor
+// Some features are supported in extended mode only (listen_only_mode...).
+//
+// Revision 1.22 2003/03/20 16:58:50 mohor
+// unix.
+//
+// Revision 1.20 2003/03/11 16:31:05 mohor
+// Mux used for clkout to avoid "gated clocks warning".
+//
+// Revision 1.19 2003/03/10 17:34:25 mohor
+// Doubled declarations removed.
+//
+// Revision 1.18 2003/03/01 22:52:11 mohor
+// Data is latched on read.
+//
+// Revision 1.17 2003/02/19 15:09:02 mohor
+// Incomplete sensitivity list fixed.
+//
+// Revision 1.16 2003/02/19 14:44:03 mohor
+// CAN core finished. Host interface added. Registers finished.
+// Synchronization to the wishbone finished.
+//
+// Revision 1.15 2003/02/18 00:10:15 mohor
+// Most of the registers added. Registers "arbitration lost capture", "error code
+// capture" + few more still need to be added.
+//
+// Revision 1.14 2003/02/14 20:17:01 mohor
+// Several registers added. Not finished, yet.
+//
+// Revision 1.13 2003/02/12 14:25:30 mohor
+// abort_tx added.
+//
+// Revision 1.12 2003/02/11 00:56:06 mohor
+// Wishbone interface added.
+//
+// Revision 1.11 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.10 2003/01/31 01:13:38 mohor
+// backup.
+//
+// Revision 1.9 2003/01/15 13:16:48 mohor
+// When a frame with "remote request" is received, no data is stored
+// to fifo, just the frame information (identifier, ...). Data length
+// that is stored is the received data length and not the actual data
+// length that is stored to fifo.
+//
+// Revision 1.8 2003/01/14 17:25:09 mohor
+// Addresses corrected to decimal values (previously hex).
+//
+// Revision 1.7 2003/01/14 12:19:35 mohor
+// rx_fifo is now working.
+//
+// Revision 1.6 2003/01/10 17:51:34 mohor
+// Temporary version (backup).
+//
+// Revision 1.5 2003/01/09 14:46:58 mohor
+// Temporary files (backup).
+//
+// Revision 1.4 2003/01/08 02:10:55 mohor
+// Acceptance filter added.
+//
+// Revision 1.3 2002/12/27 00:12:52 mohor
+// Header changed, testbench improved to send a frame (crc still missing).
+//
+// Revision 1.2 2002/12/26 16:00:34 mohor
+// Testbench define file added. Clock divider register added.
+//
+// Revision 1.1.1.1 2002/12/20 16:39:21 mohor
+// Initial
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+`include "can_defines.v"
+
+module can_registers
+(
+ clk,
+ rst,
+ cs,
+ we,
+ addr,
+ data_in,
+ data_out,
+ irq,
+
+ sample_point,
+ transmitting,
+ set_reset_mode,
+ node_bus_off,
+ error_status,
+ rx_err_cnt,
+ tx_err_cnt,
+ transmit_status,
+ receive_status,
+ tx_successful,
+ need_to_tx,
+ overrun,
+ info_empty,
+ set_bus_error_irq,
+ set_arbitration_lost_irq,
+ arbitration_lost_capture,
+ node_error_passive,
+ node_error_active,
+ rx_message_counter,
+
+
+ /* Mode register */
+ reset_mode,
+ listen_only_mode,
+ acceptance_filter_mode,
+ self_test_mode,
+
+
+ /* Command register */
+ clear_data_overrun,
+ release_buffer,
+ abort_tx,
+ tx_request,
+ self_rx_request,
+ single_shot_transmission,
+
+ /* Arbitration Lost Capture Register */
+ read_arbitration_lost_capture_reg,
+
+ /* Error Code Capture Register */
+ read_error_code_capture_reg,
+ error_capture_code,
+
+ /* Bus Timing 0 register */
+ baud_r_presc,
+ sync_jump_width,
+
+ /* Bus Timing 1 register */
+ time_segment1,
+ time_segment2,
+ triple_sampling,
+
+ /* Error Warning Limit register */
+ error_warning_limit,
+
+ /* Rx Error Counter register */
+ we_rx_err_cnt,
+
+ /* Tx Error Counter register */
+ we_tx_err_cnt,
+
+ /* Clock Divider register */
+ extended_mode,
+ clkout,
+
+
+ /* This section is for BASIC and EXTENDED mode */
+ /* Acceptance code register */
+ acceptance_code_0,
+
+ /* Acceptance mask register */
+ acceptance_mask_0,
+ /* End: This section is for BASIC and EXTENDED mode */
+
+ /* This section is for EXTENDED mode */
+ /* Acceptance code register */
+ acceptance_code_1,
+ acceptance_code_2,
+ acceptance_code_3,
+
+ /* Acceptance mask register */
+ acceptance_mask_1,
+ acceptance_mask_2,
+ acceptance_mask_3,
+ /* End: This section is for EXTENDED mode */
+
+ /* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */
+ tx_data_0,
+ tx_data_1,
+ tx_data_2,
+ tx_data_3,
+ tx_data_4,
+ tx_data_5,
+ tx_data_6,
+ tx_data_7,
+ tx_data_8,
+ tx_data_9,
+ tx_data_10,
+ tx_data_11,
+ tx_data_12
+ /* End: Tx data registers */
+
+
+
+
+);
+
+parameter Tp = 1;
+
+input clk;
+input rst;
+input cs;
+input we;
+input [7:0] addr;
+input [7:0] data_in;
+
+output [7:0] data_out;
+reg [7:0] data_out;
+
+output irq;
+
+input sample_point;
+input transmitting;
+input set_reset_mode;
+input node_bus_off;
+input error_status;
+input [7:0] rx_err_cnt;
+input [7:0] tx_err_cnt;
+input transmit_status;
+input receive_status;
+input tx_successful;
+input need_to_tx;
+input overrun;
+input info_empty;
+input set_bus_error_irq;
+input set_arbitration_lost_irq;
+input [4:0] arbitration_lost_capture;
+input node_error_passive;
+input node_error_active;
+input [6:0] rx_message_counter;
+
+
+
+/* Mode register */
+output reset_mode;
+output listen_only_mode;
+output acceptance_filter_mode;
+output self_test_mode;
+
+/* Command register */
+output clear_data_overrun;
+output release_buffer;
+output abort_tx;
+output tx_request;
+output self_rx_request;
+output single_shot_transmission;
+
+/* Arbitration Lost Capture Register */
+output read_arbitration_lost_capture_reg;
+
+/* Error Code Capture Register */
+output read_error_code_capture_reg;
+input [7:0] error_capture_code;
+
+/* Bus Timing 0 register */
+output [5:0] baud_r_presc;
+output [1:0] sync_jump_width;
+
+
+/* Bus Timing 1 register */
+output [3:0] time_segment1;
+output [2:0] time_segment2;
+output triple_sampling;
+
+/* Error Warning Limit register */
+output [7:0] error_warning_limit;
+
+/* Rx Error Counter register */
+output we_rx_err_cnt;
+
+/* Tx Error Counter register */
+output we_tx_err_cnt;
+
+/* Clock Divider register */
+output extended_mode;
+output clkout;
+
+
+/* This section is for BASIC and EXTENDED mode */
+/* Acceptance code register */
+output [7:0] acceptance_code_0;
+
+/* Acceptance mask register */
+output [7:0] acceptance_mask_0;
+
+/* End: This section is for BASIC and EXTENDED mode */
+
+
+/* This section is for EXTENDED mode */
+/* Acceptance code register */
+output [7:0] acceptance_code_1;
+output [7:0] acceptance_code_2;
+output [7:0] acceptance_code_3;
+
+/* Acceptance mask register */
+output [7:0] acceptance_mask_1;
+output [7:0] acceptance_mask_2;
+output [7:0] acceptance_mask_3;
+
+/* End: This section is for EXTENDED mode */
+
+/* Tx data registers. Holding identifier (basic mode), tx frame information (extended mode) and data */
+output [7:0] tx_data_0;
+output [7:0] tx_data_1;
+output [7:0] tx_data_2;
+output [7:0] tx_data_3;
+output [7:0] tx_data_4;
+output [7:0] tx_data_5;
+output [7:0] tx_data_6;
+output [7:0] tx_data_7;
+output [7:0] tx_data_8;
+output [7:0] tx_data_9;
+output [7:0] tx_data_10;
+output [7:0] tx_data_11;
+output [7:0] tx_data_12;
+/* End: Tx data registers */
+
+
+reg tx_successful_q;
+reg overrun_q;
+reg overrun_status;
+reg transmission_complete;
+reg transmit_buffer_status_q;
+reg receive_buffer_status;
+reg info_empty_q;
+reg error_status_q;
+reg node_bus_off_q;
+reg node_error_passive_q;
+reg transmit_buffer_status;
+reg single_shot_transmission;
+
+
+// Some interrupts exist in basic mode and in extended mode. Since they are in different registers they need to be multiplexed.
+wire data_overrun_irq_en;
+wire error_warning_irq_en;
+wire transmit_irq_en;
+wire receive_irq_en;
+
+wire [7:0] irq_reg;
+
+wire we_mode = cs & we & (addr == 8'd0);
+wire we_command = cs & we & (addr == 8'd1);
+wire we_bus_timing_0 = cs & we & (addr == 8'd6) & reset_mode;
+wire we_bus_timing_1 = cs & we & (addr == 8'd7) & reset_mode;
+wire we_clock_divider_low = cs & we & (addr == 8'd31);
+wire we_clock_divider_hi = we_clock_divider_low & reset_mode;
+
+wire read = cs & (~we);
+wire read_irq_reg = read & (addr == 8'd3);
+assign read_arbitration_lost_capture_reg = read & extended_mode & (addr == 8'd11);
+assign read_error_code_capture_reg = read & extended_mode & (addr == 8'd12);
+
+/* This section is for BASIC and EXTENDED mode */
+wire we_acceptance_code_0 = cs & we & reset_mode & ((~extended_mode) & (addr == 8'd4) | extended_mode & (addr == 8'd16));
+wire we_acceptance_mask_0 = cs & we & reset_mode & ((~extended_mode) & (addr == 8'd5) | extended_mode & (addr == 8'd20));
+wire we_tx_data_0 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd10) | extended_mode & (addr == 8'd16)) & transmit_buffer_status;
+wire we_tx_data_1 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd11) | extended_mode & (addr == 8'd17)) & transmit_buffer_status;
+wire we_tx_data_2 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd12) | extended_mode & (addr == 8'd18)) & transmit_buffer_status;
+wire we_tx_data_3 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd13) | extended_mode & (addr == 8'd19)) & transmit_buffer_status;
+wire we_tx_data_4 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd14) | extended_mode & (addr == 8'd20)) & transmit_buffer_status;
+wire we_tx_data_5 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd15) | extended_mode & (addr == 8'd21)) & transmit_buffer_status;
+wire we_tx_data_6 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd16) | extended_mode & (addr == 8'd22)) & transmit_buffer_status;
+wire we_tx_data_7 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd17) | extended_mode & (addr == 8'd23)) & transmit_buffer_status;
+wire we_tx_data_8 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd18) | extended_mode & (addr == 8'd24)) & transmit_buffer_status;
+wire we_tx_data_9 = cs & we & (~reset_mode) & ((~extended_mode) & (addr == 8'd19) | extended_mode & (addr == 8'd25)) & transmit_buffer_status;
+wire we_tx_data_10 = cs & we & (~reset_mode) & ( extended_mode & (addr == 8'd26)) & transmit_buffer_status;
+wire we_tx_data_11 = cs & we & (~reset_mode) & ( extended_mode & (addr == 8'd27)) & transmit_buffer_status;
+wire we_tx_data_12 = cs & we & (~reset_mode) & ( extended_mode & (addr == 8'd28)) & transmit_buffer_status;
+/* End: This section is for BASIC and EXTENDED mode */
+
+
+/* This section is for EXTENDED mode */
+wire we_interrupt_enable = cs & we & (addr == 8'd4) & extended_mode;
+wire we_error_warning_limit = cs & we & (addr == 8'd13) & reset_mode & extended_mode;
+assign we_rx_err_cnt = cs & we & (addr == 8'd14) & reset_mode & extended_mode;
+assign we_tx_err_cnt = cs & we & (addr == 8'd15) & reset_mode & extended_mode;
+wire we_acceptance_code_1 = cs & we & (addr == 8'd17) & reset_mode & extended_mode;
+wire we_acceptance_code_2 = cs & we & (addr == 8'd18) & reset_mode & extended_mode;
+wire we_acceptance_code_3 = cs & we & (addr == 8'd19) & reset_mode & extended_mode;
+wire we_acceptance_mask_1 = cs & we & (addr == 8'd21) & reset_mode & extended_mode;
+wire we_acceptance_mask_2 = cs & we & (addr == 8'd22) & reset_mode & extended_mode;
+wire we_acceptance_mask_3 = cs & we & (addr == 8'd23) & reset_mode & extended_mode;
+/* End: This section is for EXTENDED mode */
+
+
+
+always @ (posedge clk)
+begin
+ tx_successful_q <=#Tp tx_successful;
+ overrun_q <=#Tp overrun;
+ transmit_buffer_status_q <=#Tp transmit_buffer_status;
+ info_empty_q <=#Tp info_empty;
+ error_status_q <=#Tp error_status;
+ node_bus_off_q <=#Tp node_bus_off;
+ node_error_passive_q <=#Tp node_error_passive;
+end
+
+
+
+/* Mode register */
+wire [0:0] mode;
+wire [4:1] mode_basic;
+wire [3:1] mode_ext;
+wire receive_irq_en_basic;
+wire transmit_irq_en_basic;
+wire error_irq_en_basic;
+wire overrun_irq_en_basic;
+
+can_register_asyn_syn #(1, 1'h1) MODE_REG0
+( .data_in(data_in[0]),
+ .data_out(mode[0]),
+ .we(we_mode),
+ .clk(clk),
+ .rst(rst),
+ .rst_sync(set_reset_mode)
+);
+
+can_register_asyn #(4, 0) MODE_REG_BASIC
+( .data_in(data_in[4:1]),
+ .data_out(mode_basic[4:1]),
+ .we(we_mode),
+ .clk(clk),
+ .rst(rst)
+);
+
+can_register_asyn #(3, 0) MODE_REG_EXT
+( .data_in(data_in[3:1]),
+ .data_out(mode_ext[3:1]),
+ .we(we_mode & reset_mode),
+ .clk(clk),
+ .rst(rst)
+);
+
+assign reset_mode = mode[0];
+assign listen_only_mode = extended_mode & mode_ext[1];
+assign self_test_mode = extended_mode & mode_ext[2];
+assign acceptance_filter_mode = extended_mode & mode_ext[3];
+
+assign receive_irq_en_basic = mode_basic[1];
+assign transmit_irq_en_basic = mode_basic[2];
+assign error_irq_en_basic = mode_basic[3];
+assign overrun_irq_en_basic = mode_basic[4];
+/* End Mode register */
+
+
+/* Command register */
+wire [4:0] command;
+can_register_asyn_syn #(1, 1'h0) COMMAND_REG0
+( .data_in(data_in[0]),
+ .data_out(command[0]),
+ .we(we_command),
+ .clk(clk),
+ .rst(rst),
+ .rst_sync(tx_request & sample_point)
+);
+
+can_register_asyn_syn #(1, 1'h0) COMMAND_REG1
+( .data_in(data_in[1]),
+ .data_out(command[1]),
+ .we(we_command),
+ .clk(clk),
+ .rst(rst),
+ .rst_sync(abort_tx & ~transmitting)
+);
+
+can_register_asyn_syn #(2, 2'h0) COMMAND_REG
+( .data_in(data_in[3:2]),
+ .data_out(command[3:2]),
+ .we(we_command),
+ .clk(clk),
+ .rst(rst),
+ .rst_sync(|command[3:2])
+);
+
+can_register_asyn_syn #(1, 1'h0) COMMAND_REG4
+( .data_in(data_in[4]),
+ .data_out(command[4]),
+ .we(we_command),
+ .clk(clk),
+ .rst(rst),
+ .rst_sync(tx_successful & (~tx_successful_q) | abort_tx)
+);
+
+assign self_rx_request = command[4] & (~command[0]);
+assign clear_data_overrun = command[3];
+assign release_buffer = command[2];
+assign abort_tx = command[1] & (~command[0]) & (~command[4]);
+assign tx_request = command[0] | command[4];
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ single_shot_transmission <= 1'b0;
+ else if (we_command & data_in[1] & (data_in[1] | data_in[4]))
+ single_shot_transmission <=#Tp 1'b1;
+ else if (tx_successful & (~tx_successful_q))
+ single_shot_transmission <=#Tp 1'b0;
+end
+
+
+
+/* End Command register */
+
+
+/* Status register */
+
+wire [7:0] status;
+
+assign status[7] = node_bus_off;
+assign status[6] = error_status;
+assign status[5] = transmit_status;
+assign status[4] = receive_status;
+assign status[3] = transmission_complete;
+assign status[2] = transmit_buffer_status;
+assign status[1] = overrun_status;
+assign status[0] = receive_buffer_status;
+
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ transmission_complete <= 1'b1;
+ else if (tx_successful & (~tx_successful_q) | abort_tx)
+ transmission_complete <=#Tp 1'b1;
+ else if (tx_request)
+ transmission_complete <=#Tp 1'b0;
+end
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ transmit_buffer_status <= 1'b1;
+ else if (tx_request)
+ transmit_buffer_status <=#Tp 1'b0;
+ else if (~need_to_tx)
+ transmit_buffer_status <=#Tp 1'b1;
+end
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ overrun_status <= 1'b0;
+ else if (overrun & (~overrun_q))
+ overrun_status <=#Tp 1'b1;
+ else if (clear_data_overrun)
+ overrun_status <=#Tp 1'b0;
+end
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ receive_buffer_status <= 1'b0;
+ else if (release_buffer)
+ receive_buffer_status <=#Tp 1'b0;
+ else if (~info_empty)
+ receive_buffer_status <=#Tp 1'b1;
+end
+
+/* End Status register */
+
+
+/* Interrupt Enable register (extended mode) */
+wire [7:0] irq_en_ext;
+wire bus_error_irq_en;
+wire arbitration_lost_irq_en;
+wire error_passive_irq_en;
+wire data_overrun_irq_en_ext;
+wire error_warning_irq_en_ext;
+wire transmit_irq_en_ext;
+wire receive_irq_en_ext;
+
+can_register #(8) IRQ_EN_REG
+( .data_in(data_in),
+ .data_out(irq_en_ext),
+ .we(we_interrupt_enable),
+ .clk(clk)
+);
+
+
+assign bus_error_irq_en = irq_en_ext[7];
+assign arbitration_lost_irq_en = irq_en_ext[6];
+assign error_passive_irq_en = irq_en_ext[5];
+assign data_overrun_irq_en_ext = irq_en_ext[3];
+assign error_warning_irq_en_ext = irq_en_ext[2];
+assign transmit_irq_en_ext = irq_en_ext[1];
+assign receive_irq_en_ext = irq_en_ext[0];
+/* End Bus Timing 0 register */
+
+
+/* Bus Timing 0 register */
+wire [7:0] bus_timing_0;
+can_register #(8) BUS_TIMING_0_REG
+( .data_in(data_in),
+ .data_out(bus_timing_0),
+ .we(we_bus_timing_0),
+ .clk(clk)
+);
+
+assign baud_r_presc = bus_timing_0[5:0];
+assign sync_jump_width = bus_timing_0[7:6];
+/* End Bus Timing 0 register */
+
+
+/* Bus Timing 1 register */
+wire [7:0] bus_timing_1;
+can_register #(8) BUS_TIMING_1_REG
+( .data_in(data_in),
+ .data_out(bus_timing_1),
+ .we(we_bus_timing_1),
+ .clk(clk)
+);
+
+assign time_segment1 = bus_timing_1[3:0];
+assign time_segment2 = bus_timing_1[6:4];
+assign triple_sampling = bus_timing_1[7];
+/* End Bus Timing 1 register */
+
+
+/* Error Warning Limit register */
+can_register_asyn #(8, 96) ERROR_WARNING_REG
+( .data_in(data_in),
+ .data_out(error_warning_limit),
+ .we(we_error_warning_limit),
+ .clk(clk),
+ .rst(rst)
+);
+/* End Error Warning Limit register */
+
+
+
+/* Clock Divider register */
+wire [7:0] clock_divider;
+wire clock_off;
+wire [2:0] cd;
+reg [2:0] clkout_div;
+reg [2:0] clkout_cnt;
+reg clkout_tmp;
+//reg clkout;
+
+can_register_asyn #(1, 0) CLOCK_DIVIDER_REG_7
+( .data_in(data_in[7]),
+ .data_out(clock_divider[7]),
+ .we(we_clock_divider_hi),
+ .clk(clk),
+ .rst(rst)
+);
+
+assign clock_divider[6:4] = 3'h0;
+
+can_register_asyn #(1, 0) CLOCK_DIVIDER_REG_3
+( .data_in(data_in[3]),
+ .data_out(clock_divider[3]),
+ .we(we_clock_divider_hi),
+ .clk(clk),
+ .rst(rst)
+);
+
+can_register_asyn #(3, 0) CLOCK_DIVIDER_REG_LOW
+( .data_in(data_in[2:0]),
+ .data_out(clock_divider[2:0]),
+ .we(we_clock_divider_low),
+ .clk(clk),
+ .rst(rst)
+);
+
+assign extended_mode = clock_divider[7];
+assign clock_off = clock_divider[3];
+assign cd[2:0] = clock_divider[2:0];
+
+
+
+always @ (cd)
+begin
+ case (cd) /* synthesis full_case parallel_case */
+ 3'b000 : clkout_div <= 0;
+ 3'b001 : clkout_div <= 1;
+ 3'b010 : clkout_div <= 2;
+ 3'b011 : clkout_div <= 3;
+ 3'b100 : clkout_div <= 4;
+ 3'b101 : clkout_div <= 5;
+ 3'b110 : clkout_div <= 6;
+ 3'b111 : clkout_div <= 0;
+ endcase
+end
+
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ clkout_cnt <= 3'h0;
+ else if (clkout_cnt == clkout_div)
+ clkout_cnt <=#Tp 3'h0;
+ else
+ clkout_cnt <= clkout_cnt + 1'b1;
+end
+
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ clkout_tmp <= 1'b0;
+ else if (clkout_cnt == clkout_div)
+ clkout_tmp <=#Tp ~clkout_tmp;
+end
+
+
+/*
+//always @ (cd or clk or clkout_tmp or clock_off)
+always @ (cd or clkout_tmp or clock_off)
+begin
+ if (clock_off)
+ clkout <=#Tp 1'b1;
+// else if (&cd)
+// clkout <=#Tp clk;
+ else
+ clkout <=#Tp clkout_tmp;
+end
+*/
+assign clkout = clock_off ? 1'b1 : ((&cd)? clk : clkout_tmp);
+
+
+
+/* End Clock Divider register */
+
+
+
+
+/* This section is for BASIC and EXTENDED mode */
+
+/* Acceptance code register */
+can_register #(8) ACCEPTANCE_CODE_REG0
+( .data_in(data_in),
+ .data_out(acceptance_code_0),
+ .we(we_acceptance_code_0),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance mask register */
+can_register #(8) ACCEPTANCE_MASK_REG0
+( .data_in(data_in),
+ .data_out(acceptance_mask_0),
+ .we(we_acceptance_mask_0),
+ .clk(clk)
+);
+/* End: Acceptance mask register */
+/* End: This section is for BASIC and EXTENDED mode */
+
+
+/* Tx data 0 register. */
+can_register #(8) TX_DATA_REG0
+( .data_in(data_in),
+ .data_out(tx_data_0),
+ .we(we_tx_data_0),
+ .clk(clk)
+);
+/* End: Tx data 0 register. */
+
+
+/* Tx data 1 register. */
+can_register #(8) TX_DATA_REG1
+( .data_in(data_in),
+ .data_out(tx_data_1),
+ .we(we_tx_data_1),
+ .clk(clk)
+);
+/* End: Tx data 1 register. */
+
+
+/* Tx data 2 register. */
+can_register #(8) TX_DATA_REG2
+( .data_in(data_in),
+ .data_out(tx_data_2),
+ .we(we_tx_data_2),
+ .clk(clk)
+);
+/* End: Tx data 2 register. */
+
+
+/* Tx data 3 register. */
+can_register #(8) TX_DATA_REG3
+( .data_in(data_in),
+ .data_out(tx_data_3),
+ .we(we_tx_data_3),
+ .clk(clk)
+);
+/* End: Tx data 3 register. */
+
+
+/* Tx data 4 register. */
+can_register #(8) TX_DATA_REG4
+( .data_in(data_in),
+ .data_out(tx_data_4),
+ .we(we_tx_data_4),
+ .clk(clk)
+);
+/* End: Tx data 4 register. */
+
+
+/* Tx data 5 register. */
+can_register #(8) TX_DATA_REG5
+( .data_in(data_in),
+ .data_out(tx_data_5),
+ .we(we_tx_data_5),
+ .clk(clk)
+);
+/* End: Tx data 5 register. */
+
+
+/* Tx data 6 register. */
+can_register #(8) TX_DATA_REG6
+( .data_in(data_in),
+ .data_out(tx_data_6),
+ .we(we_tx_data_6),
+ .clk(clk)
+);
+/* End: Tx data 6 register. */
+
+
+/* Tx data 7 register. */
+can_register #(8) TX_DATA_REG7
+( .data_in(data_in),
+ .data_out(tx_data_7),
+ .we(we_tx_data_7),
+ .clk(clk)
+);
+/* End: Tx data 7 register. */
+
+
+/* Tx data 8 register. */
+can_register #(8) TX_DATA_REG8
+( .data_in(data_in),
+ .data_out(tx_data_8),
+ .we(we_tx_data_8),
+ .clk(clk)
+);
+/* End: Tx data 8 register. */
+
+
+/* Tx data 9 register. */
+can_register #(8) TX_DATA_REG9
+( .data_in(data_in),
+ .data_out(tx_data_9),
+ .we(we_tx_data_9),
+ .clk(clk)
+);
+/* End: Tx data 9 register. */
+
+
+/* Tx data 10 register. */
+can_register #(8) TX_DATA_REG10
+( .data_in(data_in),
+ .data_out(tx_data_10),
+ .we(we_tx_data_10),
+ .clk(clk)
+);
+/* End: Tx data 10 register. */
+
+
+/* Tx data 11 register. */
+can_register #(8) TX_DATA_REG11
+( .data_in(data_in),
+ .data_out(tx_data_11),
+ .we(we_tx_data_11),
+ .clk(clk)
+);
+/* End: Tx data 11 register. */
+
+
+/* Tx data 12 register. */
+can_register #(8) TX_DATA_REG12
+( .data_in(data_in),
+ .data_out(tx_data_12),
+ .we(we_tx_data_12),
+ .clk(clk)
+);
+/* End: Tx data 12 register. */
+
+
+
+
+
+/* This section is for EXTENDED mode */
+
+/* Acceptance code register 1 */
+can_register #(8) ACCEPTANCE_CODE_REG1
+( .data_in(data_in),
+ .data_out(acceptance_code_1),
+ .we(we_acceptance_code_1),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance code register 2 */
+can_register #(8) ACCEPTANCE_CODE_REG2
+( .data_in(data_in),
+ .data_out(acceptance_code_2),
+ .we(we_acceptance_code_2),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance code register 3 */
+can_register #(8) ACCEPTANCE_CODE_REG3
+( .data_in(data_in),
+ .data_out(acceptance_code_3),
+ .we(we_acceptance_code_3),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance mask register 1 */
+can_register #(8) ACCEPTANCE_MASK_REG1
+( .data_in(data_in),
+ .data_out(acceptance_mask_1),
+ .we(we_acceptance_mask_1),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance mask register 2 */
+can_register #(8) ACCEPTANCE_MASK_REG2
+( .data_in(data_in),
+ .data_out(acceptance_mask_2),
+ .we(we_acceptance_mask_2),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* Acceptance mask register 3 */
+can_register #(8) ACCEPTANCE_MASK_REG3
+( .data_in(data_in),
+ .data_out(acceptance_mask_3),
+ .we(we_acceptance_mask_3),
+ .clk(clk)
+);
+/* End: Acceptance code register */
+
+
+/* End: This section is for EXTENDED mode */
+
+
+
+
+// Reading data from registers
+always @ ( addr or read or extended_mode or mode or bus_timing_0 or bus_timing_1 or clock_divider or
+ acceptance_code_0 or acceptance_code_1 or acceptance_code_2 or acceptance_code_3 or
+ acceptance_mask_0 or acceptance_mask_1 or acceptance_mask_2 or acceptance_mask_3 or
+ reset_mode or tx_data_0 or tx_data_1 or tx_data_2 or tx_data_3 or tx_data_4 or
+ tx_data_5 or tx_data_6 or tx_data_7 or tx_data_8 or tx_data_9 or status or
+ error_warning_limit or rx_err_cnt or tx_err_cnt or irq_en_ext or irq_reg or mode_ext or
+ arbitration_lost_capture or rx_message_counter or mode_basic or error_capture_code
+ )
+begin
+ if(read) // read
+ begin
+ if (extended_mode) // EXTENDED mode (Different register map depends on mode)
+ begin
+ case(addr) /* synthesis full_case parallel_case */
+ 8'd0 : data_out <= {4'b0000, mode_ext[3:1], mode[0]};
+ 8'd1 : data_out <= 8'h0;
+ 8'd2 : data_out <= status;
+ 8'd3 : data_out <= irq_reg;
+ 8'd4 : data_out <= irq_en_ext;
+ 8'd6 : data_out <= bus_timing_0;
+ 8'd7 : data_out <= bus_timing_1;
+ 8'd11 : data_out <= {3'h0, arbitration_lost_capture[4:0]};
+ 8'd12 : data_out <= error_capture_code;
+ 8'd13 : data_out <= error_warning_limit;
+ 8'd14 : data_out <= rx_err_cnt;
+ 8'd15 : data_out <= tx_err_cnt;
+ 8'd16 : data_out <= acceptance_code_0;
+ 8'd17 : data_out <= acceptance_code_1;
+ 8'd18 : data_out <= acceptance_code_2;
+ 8'd19 : data_out <= acceptance_code_3;
+ 8'd20 : data_out <= acceptance_mask_0;
+ 8'd21 : data_out <= acceptance_mask_1;
+ 8'd22 : data_out <= acceptance_mask_2;
+ 8'd23 : data_out <= acceptance_mask_3;
+ 8'd24 : data_out <= 8'h0;
+ 8'd25 : data_out <= 8'h0;
+ 8'd26 : data_out <= 8'h0;
+ 8'd27 : data_out <= 8'h0;
+ 8'd28 : data_out <= 8'h0;
+ 8'd29 : data_out <= {1'b0, rx_message_counter};
+ 8'd31 : data_out <= clock_divider;
+ endcase
+ end
+ else // BASIC mode
+ begin
+ case(addr) /* synthesis full_case parallel_case */
+ 8'd0 : data_out <= {3'b001, mode_basic[4:1], mode[0]};
+ 8'd1 : data_out <= 8'hff;
+ 8'd2 : data_out <= status;
+ 8'd3 : data_out <= {4'hf, irq_reg[3:0]};
+ 8'd4 : data_out <= reset_mode? acceptance_code_0 : 8'hff;
+ 8'd5 : data_out <= reset_mode? acceptance_mask_0 : 8'hff;
+ 8'd6 : data_out <= reset_mode? bus_timing_0 : 8'hff;
+ 8'd7 : data_out <= reset_mode? bus_timing_1 : 8'hff;
+ 8'd10 : data_out <= reset_mode? 8'hff : tx_data_0;
+ 8'd11 : data_out <= reset_mode? 8'hff : tx_data_1;
+ 8'd12 : data_out <= reset_mode? 8'hff : tx_data_2;
+ 8'd13 : data_out <= reset_mode? 8'hff : tx_data_3;
+ 8'd14 : data_out <= reset_mode? 8'hff : tx_data_4;
+ 8'd15 : data_out <= reset_mode? 8'hff : tx_data_5;
+ 8'd16 : data_out <= reset_mode? 8'hff : tx_data_6;
+ 8'd17 : data_out <= reset_mode? 8'hff : tx_data_7;
+ 8'd18 : data_out <= reset_mode? 8'hff : tx_data_8;
+ 8'd19 : data_out <= reset_mode? 8'hff : tx_data_9;
+ 8'd31 : data_out <= clock_divider;
+ endcase
+ end
+ end
+ else
+ data_out <= 8'h0;
+end
+
+
+// Some interrupts exist in basic mode and in extended mode. Since they are in different registers they need to be multiplexed.
+assign data_overrun_irq_en = extended_mode ? data_overrun_irq_en_ext : overrun_irq_en_basic;
+assign error_warning_irq_en = extended_mode ? error_warning_irq_en_ext : error_irq_en_basic;
+assign transmit_irq_en = extended_mode ? transmit_irq_en_ext : transmit_irq_en_basic;
+assign receive_irq_en = extended_mode ? receive_irq_en_ext : receive_irq_en_basic;
+
+
+reg data_overrun_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ data_overrun_irq <= 1'b0;
+ else if (overrun & (~overrun_q) & data_overrun_irq_en)
+ data_overrun_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ data_overrun_irq <=#Tp 1'b0;
+end
+
+
+reg transmit_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ transmit_irq <= 1'b0;
+ else if (transmit_buffer_status & (~transmit_buffer_status_q) & transmit_irq_en)
+ transmit_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ transmit_irq <=#Tp 1'b0;
+end
+
+
+reg receive_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ receive_irq <= 1'b0;
+ else if (release_buffer)
+ receive_irq <=#Tp 1'b0;
+ else if ((~info_empty) & (~receive_irq) & receive_irq_en)
+ receive_irq <=#Tp 1'b1;
+end
+
+
+reg error_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ error_irq <= 1'b0;
+ else if (((error_status ^ error_status_q) | (node_bus_off ^ node_bus_off_q)) & error_warning_irq_en)
+ error_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ error_irq <=#Tp 1'b0;
+end
+
+
+reg bus_error_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ bus_error_irq <= 1'b0;
+ else if (set_bus_error_irq & bus_error_irq_en)
+ bus_error_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ bus_error_irq <=#Tp 1'b0;
+end
+
+
+reg arbitration_lost_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ arbitration_lost_irq <= 1'b0;
+ else if (set_arbitration_lost_irq & arbitration_lost_irq_en)
+ arbitration_lost_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ arbitration_lost_irq <=#Tp 1'b0;
+end
+
+
+
+reg error_passive_irq;
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ error_passive_irq <= 1'b0;
+ else if ((node_error_passive & (~node_error_passive_q) | (~node_error_passive) & node_error_passive_q & node_error_active) & error_passive_irq_en)
+ error_passive_irq <=#Tp 1'b1;
+ else if (read_irq_reg)
+ error_passive_irq <=#Tp 1'b0;
+end
+
+
+
+assign irq_reg = {bus_error_irq, arbitration_lost_irq, error_passive_irq, 1'b0, data_overrun_irq, error_irq, transmit_irq, receive_irq};
+
+assign irq = data_overrun_irq | transmit_irq | receive_irq | error_irq | bus_error_irq | arbitration_lost_irq | error_passive_irq;
+
+
+
+
+
+endmodule
verilog/can_registers.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_register_asyn.v
===================================================================
--- verilog/can_register_asyn.v (nonexistent)
+++ verilog/can_register_asyn.v (revision 161)
@@ -0,0 +1,105 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_register_asyn.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.4 2003/03/11 16:32:34 mohor
+// timescale.v is used for simulation only.
+//
+// Revision 1.3 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.2 2002/12/27 00:12:52 mohor
+// Header changed, testbench improved to send a frame (crc still missing).
+//
+// Revision 1.1.1.1 2002/12/20 16:39:21 mohor
+// Initial
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+
+
+module can_register_asyn
+( data_in,
+ data_out,
+ we,
+ clk,
+ rst
+);
+
+parameter WIDTH = 8; // default parameter of the register width
+parameter RESET_VALUE = 0;
+
+input [WIDTH-1:0] data_in;
+input we;
+input clk;
+input rst;
+
+output [WIDTH-1:0] data_out;
+reg [WIDTH-1:0] data_out;
+
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if (rst) // asynchronous reset
+ data_out<=#1 RESET_VALUE;
+ else if (we) // write
+ data_out<=#1 data_in;
+end
+
+
+
+endmodule
verilog/can_register_asyn.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_register.v
===================================================================
--- verilog/can_register.v (nonexistent)
+++ verilog/can_register.v (revision 161)
@@ -0,0 +1,100 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_register.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.4 2003/03/11 16:32:34 mohor
+// timescale.v is used for simulation only.
+//
+// Revision 1.3 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.2 2002/12/27 00:12:52 mohor
+// Header changed, testbench improved to send a frame (crc still missing).
+//
+// Revision 1.1.1.1 2002/12/20 16:39:21 mohor
+// Initial
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+
+
+module can_register
+( data_in,
+ data_out,
+ we,
+ clk
+);
+
+parameter WIDTH = 8; // default parameter of the register width
+
+input [WIDTH-1:0] data_in;
+input we;
+input clk;
+
+output [WIDTH-1:0] data_out;
+reg [WIDTH-1:0] data_out;
+
+
+
+always @ (posedge clk)
+begin
+ if (we) // write
+ data_out<=#1 data_in;
+end
+
+
+
+endmodule
verilog/can_register.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_register_asyn_syn.v
===================================================================
--- verilog/can_register_asyn_syn.v (nonexistent)
+++ verilog/can_register_asyn_syn.v (revision 161)
@@ -0,0 +1,109 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_register_asyn_syn.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.4 2003/03/11 16:32:34 mohor
+// timescale.v is used for simulation only.
+//
+// Revision 1.3 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.2 2002/12/27 00:12:52 mohor
+// Header changed, testbench improved to send a frame (crc still missing).
+//
+// Revision 1.1.1.1 2002/12/20 16:39:21 mohor
+// Initial
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+
+
+module can_register_asyn_syn
+( data_in,
+ data_out,
+ we,
+ clk,
+ rst,
+ rst_sync
+);
+
+parameter WIDTH = 8; // default parameter of the register width
+parameter RESET_VALUE = 0;
+
+input [WIDTH-1:0] data_in;
+input we;
+input clk;
+input rst;
+input rst_sync;
+
+output [WIDTH-1:0] data_out;
+reg [WIDTH-1:0] data_out;
+
+
+
+always @ (posedge clk or posedge rst)
+begin
+ if(rst)
+ data_out<=#1 RESET_VALUE;
+ else if (rst_sync) // synchronous reset
+ data_out<=#1 RESET_VALUE;
+ else if (we) // write
+ data_out<=#1 data_in;
+end
+
+
+
+endmodule
verilog/can_register_asyn_syn.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_register_syn.v
===================================================================
--- verilog/can_register_syn.v (nonexistent)
+++ verilog/can_register_syn.v (revision 161)
@@ -0,0 +1,102 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_register_syn.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.3 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.2 2002/12/27 00:12:52 mohor
+// Header changed, testbench improved to send a frame (crc still missing).
+//
+// Revision 1.1.1.1 2002/12/20 16:39:21 mohor
+// Initial
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+
+
+module can_register_syn
+( data_in,
+ data_out,
+ we,
+ clk,
+ rst_sync
+);
+
+parameter WIDTH = 8; // default parameter of the register width
+parameter RESET_VALUE = 0;
+
+input [WIDTH-1:0] data_in;
+input we;
+input clk;
+input rst_sync;
+
+output [WIDTH-1:0] data_out;
+reg [WIDTH-1:0] data_out;
+
+
+
+always @ (posedge clk)
+begin
+ if (rst_sync) // synchronous reset
+ data_out<=#1 RESET_VALUE;
+ else if (we) // write
+ data_out<=#1 data_in;
+end
+
+
+
+endmodule
verilog/can_register_syn.v
Property changes :
Added: svn:executable
## -0,0 +1 ##
+*
\ No newline at end of property
Index: verilog/can_crc.v
===================================================================
--- verilog/can_crc.v (nonexistent)
+++ verilog/can_crc.v (revision 161)
@@ -0,0 +1,103 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_crc.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.2 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.1 2003/01/08 02:10:54 mohor
+// Acceptance filter added.
+//
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+
+module can_crc (clk, data, enable, initialize, crc);
+
+
+parameter Tp = 1;
+
+input clk;
+input data;
+input enable;
+input initialize;
+
+output [14:0] crc;
+
+reg [14:0] crc;
+
+wire crc_next;
+wire [14:0] crc_tmp;
+
+
+assign crc_next = data ^ crc[14];
+assign crc_tmp = {crc[13:0], 1'b0};
+
+always @ (posedge clk)
+begin
+ if(initialize)
+ crc <= #Tp 0;
+ else if (enable)
+ begin
+ if (crc_next)
+ crc <= #Tp crc_tmp ^ 15'h4599;
+ else
+ crc <= #Tp crc_tmp;
+ end
+end
+
+
+endmodule
Index: verilog/can_acf.v
===================================================================
--- verilog/can_acf.v (nonexistent)
+++ verilog/can_acf.v (revision 161)
@@ -0,0 +1,369 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_acf.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.5 2003/02/09 18:40:29 mohor
+// Overload fixed. Hard synchronization also enabled at the last bit of
+// interframe.
+//
+// Revision 1.4 2003/02/09 02:24:33 mohor
+// Bosch license warning added. Error counters finished. Overload frames
+// still need to be fixed.
+//
+// Revision 1.3 2003/01/31 01:13:37 mohor
+// backup.
+//
+// Revision 1.2 2003/01/14 12:19:35 mohor
+// rx_fifo is now working.
+//
+// Revision 1.1 2003/01/08 02:13:15 mohor
+// Acceptance filter added.
+//
+//
+//
+//
+
+// synopsys translate_off
+`include "timescale.v"
+// synopsys translate_on
+`include "can_defines.v"
+
+module can_acf
+(
+ clk,
+ rst,
+
+ id,
+
+ /* Mode register */
+ reset_mode,
+ acceptance_filter_mode,
+
+ extended_mode,
+
+ acceptance_code_0,
+ acceptance_code_1,
+ acceptance_code_2,
+ acceptance_code_3,
+ acceptance_mask_0,
+ acceptance_mask_1,
+ acceptance_mask_2,
+ acceptance_mask_3,
+
+ go_rx_crc_lim,
+ go_rx_inter,
+ go_error_frame,
+
+ data0,
+ data1,
+ rtr1,
+ rtr2,
+ ide,
+ no_byte0,
+ no_byte1,
+
+
+ id_ok
+
+
+);
+
+parameter Tp = 1;
+
+input clk;
+input rst;
+input [28:0] id;
+input reset_mode;
+input acceptance_filter_mode;
+input extended_mode;
+
+input [7:0] acceptance_code_0;
+input [7:0] acceptance_code_1;
+input [7:0] acceptance_code_2;
+input [7:0] acceptance_code_3;
+input [7:0] acceptance_mask_0;
+input [7:0] acceptance_mask_1;
+input [7:0] acceptance_mask_2;
+input [7:0] acceptance_mask_3;
+input go_rx_crc_lim;
+input go_rx_inter;
+input go_error_frame;
+input [7:0] data0;
+input [7:0] data1;
+input rtr1;
+input rtr2;
+input ide;
+input no_byte0;
+input no_byte1;
+
+
+output id_ok;
+
+reg id_ok;
+
+wire match;
+wire match_sf_std;
+wire match_sf_ext;
+wire match_df_std;
+wire match_df_ext;
+
+
+// Working in basic mode. ID match for standard format (11-bit ID).
+assign match = ( (id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
+ (id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
+ (id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
+ (id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
+ (id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
+ (id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
+ (id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
+ (id[10] == acceptance_code_0[7] | acceptance_mask_0[7] )
+ );
+
+
+// Working in extended mode. ID match for standard format (11-bit ID). Using single filter.
+assign match_sf_std = ( (id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
+ (id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
+ (id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
+ (id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
+ (id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
+ (id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
+ (id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
+ (id[10] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
+
+ (rtr1 == acceptance_code_1[4] | acceptance_mask_1[4] ) &
+ (id[0] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
+ (id[1] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
+ (id[2] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
+
+ (data0[0] == acceptance_code_2[0] | acceptance_mask_2[0] | no_byte0) &
+ (data0[1] == acceptance_code_2[1] | acceptance_mask_2[1] | no_byte0) &
+ (data0[2] == acceptance_code_2[2] | acceptance_mask_2[2] | no_byte0) &
+ (data0[3] == acceptance_code_2[3] | acceptance_mask_2[3] | no_byte0) &
+ (data0[4] == acceptance_code_2[4] | acceptance_mask_2[4] | no_byte0) &
+ (data0[5] == acceptance_code_2[5] | acceptance_mask_2[5] | no_byte0) &
+ (data0[6] == acceptance_code_2[6] | acceptance_mask_2[6] | no_byte0) &
+ (data0[7] == acceptance_code_2[7] | acceptance_mask_2[7] | no_byte0) &
+
+ (data1[0] == acceptance_code_3[0] | acceptance_mask_3[0] | no_byte1) &
+ (data1[1] == acceptance_code_3[1] | acceptance_mask_3[1] | no_byte1) &
+ (data1[2] == acceptance_code_3[2] | acceptance_mask_3[2] | no_byte1) &
+ (data1[3] == acceptance_code_3[3] | acceptance_mask_3[3] | no_byte1) &
+ (data1[4] == acceptance_code_3[4] | acceptance_mask_3[4] | no_byte1) &
+ (data1[5] == acceptance_code_3[5] | acceptance_mask_3[5] | no_byte1) &
+ (data1[6] == acceptance_code_3[6] | acceptance_mask_3[6] | no_byte1) &
+ (data1[7] == acceptance_code_3[7] | acceptance_mask_3[7] | no_byte1)
+ );
+
+
+
+// Working in extended mode. ID match for extended format (29-bit ID). Using single filter.
+assign match_sf_ext = ( (id[21] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
+ (id[22] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
+ (id[23] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
+ (id[24] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
+ (id[25] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
+ (id[26] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
+ (id[27] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
+ (id[28] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
+
+ (id[13] == acceptance_code_1[0] | acceptance_mask_1[0] ) &
+ (id[14] == acceptance_code_1[1] | acceptance_mask_1[1] ) &
+ (id[15] == acceptance_code_1[2] | acceptance_mask_1[2] ) &
+ (id[16] == acceptance_code_1[3] | acceptance_mask_1[3] ) &
+ (id[17] == acceptance_code_1[4] | acceptance_mask_1[4] ) &
+ (id[18] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
+ (id[19] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
+ (id[20] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
+
+ (id[5] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
+ (id[6] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
+ (id[7] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
+ (id[8] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
+ (id[9] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
+ (id[10] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
+ (id[11] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
+ (id[12] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
+
+ (rtr2 == acceptance_code_3[2] | acceptance_mask_3[2] ) &
+ (id[0] == acceptance_code_3[3] | acceptance_mask_3[3] ) &
+ (id[1] == acceptance_code_3[4] | acceptance_mask_3[4] ) &
+ (id[2] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
+ (id[3] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
+ (id[4] == acceptance_code_3[7] | acceptance_mask_3[7] )
+
+ );
+
+
+// Working in extended mode. ID match for standard format (11-bit ID). Using double filter.
+assign match_df_std = (((id[3] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
+ (id[4] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
+ (id[5] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
+ (id[6] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
+ (id[7] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
+ (id[8] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
+ (id[9] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
+ (id[10] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
+
+ (rtr1 == acceptance_code_1[4] | acceptance_mask_1[4] ) &
+ (id[0] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
+ (id[1] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
+ (id[2] == acceptance_code_1[7] | acceptance_mask_1[7] ) &
+
+ (data0[0] == acceptance_code_3[0] | acceptance_mask_3[0] | no_byte0) &
+ (data0[1] == acceptance_code_3[1] | acceptance_mask_3[1] | no_byte0) &
+ (data0[2] == acceptance_code_3[2] | acceptance_mask_3[2] | no_byte0) &
+ (data0[3] == acceptance_code_3[3] | acceptance_mask_3[3] | no_byte0) &
+ (data0[4] == acceptance_code_1[4] | acceptance_mask_1[4] | no_byte0) &
+ (data0[5] == acceptance_code_1[5] | acceptance_mask_1[5] | no_byte0) &
+ (data0[6] == acceptance_code_1[6] | acceptance_mask_1[6] | no_byte0) &
+ (data0[7] == acceptance_code_1[7] | acceptance_mask_1[7] | no_byte0) )
+
+ |
+
+ ((id[3] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
+ (id[4] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
+ (id[5] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
+ (id[6] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
+ (id[7] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
+ (id[8] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
+ (id[9] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
+ (id[10] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
+
+ (rtr1 == acceptance_code_3[4] | acceptance_mask_3[4] ) &
+ (id[0] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
+ (id[1] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
+ (id[2] == acceptance_code_3[7] | acceptance_mask_3[7] ) )
+
+ );
+
+
+// Working in extended mode. ID match for extended format (29-bit ID). Using double filter.
+assign match_df_ext = (((id[21] == acceptance_code_0[0] | acceptance_mask_0[0] ) &
+ (id[22] == acceptance_code_0[1] | acceptance_mask_0[1] ) &
+ (id[23] == acceptance_code_0[2] | acceptance_mask_0[2] ) &
+ (id[24] == acceptance_code_0[3] | acceptance_mask_0[3] ) &
+ (id[25] == acceptance_code_0[4] | acceptance_mask_0[4] ) &
+ (id[26] == acceptance_code_0[5] | acceptance_mask_0[5] ) &
+ (id[27] == acceptance_code_0[6] | acceptance_mask_0[6] ) &
+ (id[28] == acceptance_code_0[7] | acceptance_mask_0[7] ) &
+
+ (id[13] == acceptance_code_1[0] | acceptance_mask_1[0] ) &
+ (id[14] == acceptance_code_1[1] | acceptance_mask_1[1] ) &
+ (id[15] == acceptance_code_1[2] | acceptance_mask_1[2] ) &
+ (id[16] == acceptance_code_1[3] | acceptance_mask_1[3] ) &
+ (id[17] == acceptance_code_1[4] | acceptance_mask_1[4] ) &
+ (id[18] == acceptance_code_1[5] | acceptance_mask_1[5] ) &
+ (id[19] == acceptance_code_1[6] | acceptance_mask_1[6] ) &
+ (id[20] == acceptance_code_1[7] | acceptance_mask_1[7] ) )
+
+ |
+
+ ((id[21] == acceptance_code_2[0] | acceptance_mask_2[0] ) &
+ (id[22] == acceptance_code_2[1] | acceptance_mask_2[1] ) &
+ (id[23] == acceptance_code_2[2] | acceptance_mask_2[2] ) &
+ (id[24] == acceptance_code_2[3] | acceptance_mask_2[3] ) &
+ (id[25] == acceptance_code_2[4] | acceptance_mask_2[4] ) &
+ (id[26] == acceptance_code_2[5] | acceptance_mask_2[5] ) &
+ (id[27] == acceptance_code_2[6] | acceptance_mask_2[6] ) &
+ (id[28] == acceptance_code_2[7] | acceptance_mask_2[7] ) &
+
+ (id[13] == acceptance_code_3[0] | acceptance_mask_3[0] ) &
+ (id[14] == acceptance_code_3[1] | acceptance_mask_3[1] ) &
+ (id[15] == acceptance_code_3[2] | acceptance_mask_3[2] ) &
+ (id[16] == acceptance_code_3[3] | acceptance_mask_3[3] ) &
+ (id[17] == acceptance_code_3[4] | acceptance_mask_3[4] ) &
+ (id[18] == acceptance_code_3[5] | acceptance_mask_3[5] ) &
+ (id[19] == acceptance_code_3[6] | acceptance_mask_3[6] ) &
+ (id[20] == acceptance_code_3[7] | acceptance_mask_3[7] ) )
+ );
+
+
+
+// ID ok signal generation
+always @ (posedge clk or posedge rst)
+begin
+ if (rst)
+ id_ok <= 0;
+ else if (go_rx_crc_lim) // sample_point is already included in go_rx_crc_lim
+ begin
+ if (extended_mode)
+ begin
+ if (acceptance_filter_mode) // dual filter
+ begin
+ if (ide) // extended frame message
+ id_ok <=#Tp match_df_ext;
+ else // standard frame message
+ id_ok <=#Tp match_df_std;
+ end
+ else // single filter
+ begin
+ if (ide) // extended frame message
+ id_ok <=#Tp match_sf_ext;
+ else // standard frame message
+ id_ok <=#Tp match_sf_std;
+ end
+ end
+ else
+ id_ok <=#Tp match;
+ end
+ else if (reset_mode | go_rx_inter | go_error_frame) // sample_point is already included in go_rx_inter
+ id_ok <=#Tp 0;
+end
+
+
+
+
+
+
+
+
+
+endmodule
Index: verilog/can_ibo.v
===================================================================
--- verilog/can_ibo.v (nonexistent)
+++ verilog/can_ibo.v (revision 161)
@@ -0,0 +1,80 @@
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// can_ibo.v ////
+//// ////
+//// ////
+//// This file is part of the CAN Protocol Controller ////
+//// http://www.opencores.org/projects/can/ ////
+//// ////
+//// ////
+//// Author(s): ////
+//// Igor Mohor ////
+//// igorm@opencores.org ////
+//// ////
+//// ////
+//// All additional information is available in the README.txt ////
+//// file. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//// ////
+//// Copyright (C) 2002, 2003 Authors ////
+//// ////
+//// This source file may be used and distributed without ////
+//// restriction provided that this copyright statement is not ////
+//// removed from the file and that any derivative work contains ////
+//// the original copyright notice and the associated disclaimer. ////
+//// ////
+//// This source file is free software; you can redistribute it ////
+//// and/or modify it under the terms of the GNU Lesser General ////
+//// Public License as published by the Free Software Foundation; ////
+//// either version 2.1 of the License, or (at your option) any ////
+//// later version. ////
+//// ////
+//// This source is distributed in the hope that it will be ////
+//// useful, but WITHOUT ANY WARRANTY; without even the implied ////
+//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
+//// PURPOSE. See the GNU Lesser General Public License for more ////
+//// details. ////
+//// ////
+//// You should have received a copy of the GNU Lesser General ////
+//// Public License along with this source; if not, download it ////
+//// from http://www.opencores.org/lgpl.shtml ////
+//// ////
+//// The CAN protocol is developed by Robert Bosch GmbH and ////
+//// protected by patents. Anybody who wants to implement this ////
+//// CAN IP core on silicon has to obtain a CAN protocol license ////
+//// from Bosch. ////
+//// ////
+//////////////////////////////////////////////////////////////////////
+//
+// CVS Revision History
+//
+// $Log: not supported by cvs2svn $
+// Revision 1.1 2003/02/04 14:34:52 mohor
+// *** empty log message ***
+//
+//
+//
+//
+
+
+// This module only inverts bit order
+module can_ibo
+(
+ di,
+ do
+);
+
+input [7:0] di;
+output [7:0] do;
+
+assign do[0] = di[7];
+assign do[1] = di[6];
+assign do[2] = di[5];
+assign do[3] = di[4];
+assign do[4] = di[3];
+assign do[5] = di[2];
+assign do[6] = di[1];
+assign do[7] = di[0];
+
+endmodule