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/tags/asyst_2/rtl/verilog/spi_top.v
0,0 → 1,287
////////////////////////////////////////////////////////////////////// |
//// //// |
//// spi_top.v //// |
//// //// |
//// This file is part of the SPI IP core project //// |
//// http://www.opencores.org/projects/spi/ //// |
//// //// |
//// Author(s): //// |
//// - Simon Srot (simons@opencores.org) //// |
//// //// |
//// All additional information is avaliable in the Readme.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002 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 //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
|
|
`include "spi_defines.v" |
`include "timescale.v" |
|
module spi_top |
( |
// Wishbone signals |
wb_clk_i, wb_rst_i, wb_adr_i, wb_dat_i, wb_dat_o, wb_sel_i, |
wb_we_i, wb_stb_i, wb_cyc_i, wb_ack_o, wb_err_o, wb_int_o, |
|
// SPI signals |
ss_pad_o, sclk_pad_o, mosi_pad_o, miso_pad_i |
); |
|
parameter Tp = 1; |
|
// Wishbone signals |
input wb_clk_i; // master clock input |
input wb_rst_i; // synchronous active high reset |
input [4:0] wb_adr_i; // lower address bits |
input [32-1:0] wb_dat_i; // databus input |
output [32-1:0] wb_dat_o; // databus output |
input [3:0] wb_sel_i; // byte select inputs |
input wb_we_i; // write enable input |
input wb_stb_i; // stobe/core select signal |
input wb_cyc_i; // valid bus cycle input |
output wb_ack_o; // bus cycle acknowledge output |
output wb_err_o; // termination w/ error |
output wb_int_o; // interrupt request signal output |
|
// SPI signals |
output [`SPI_SS_NB-1:0] ss_pad_o; // slave select |
output sclk_pad_o; // serial clock |
output mosi_pad_o; // master out slave in |
input miso_pad_i; // master in slave out |
|
reg [32-1:0] wb_dat_o; |
reg wb_ack_o; |
reg wb_int_o; |
|
// Internal signals |
reg [`SPI_DIVIDER_LEN-1:0] divider; // Divider register |
reg [`SPI_CTRL_BIT_NB-1:0] ctrl; // Control and status register |
reg [`SPI_SS_NB-1:0] ss; // Slave select register |
reg [32-1:0] wb_dat; // wb data out |
wire [`SPI_MAX_CHAR-1:0] rx; // Rx register |
wire rx_negedge; // miso is sampled on negative edge |
wire tx_negedge; // mosi is driven on negative edge |
wire [`SPI_CHAR_LEN_BITS-1:0] char_len; // char len |
wire go; // go |
wire lsb; // lsb first on line |
wire ie; // interrupt enable |
wire ass; // automatic slave select |
wire spi_divider_sel; // divider register select |
wire spi_ctrl_sel; // ctrl register select |
wire [3:0] spi_tx_sel; // tx_l register select |
wire spi_ss_sel; // ss register select |
wire tip; // transfer in progress |
wire pos_edge; // recognize posedge of sclk |
wire neg_edge; // recognize negedge of sclk |
wire last_bit; // marks last character bit |
|
// Address decoder |
assign spi_divider_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_DEVIDE); |
assign spi_ctrl_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_CTRL); |
assign spi_tx_sel[0] = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_0); |
assign spi_tx_sel[1] = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_1); |
assign spi_tx_sel[2] = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_2); |
assign spi_tx_sel[3] = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_TX_3); |
assign spi_ss_sel = wb_cyc_i & wb_stb_i & (wb_adr_i[`SPI_OFS_BITS] == `SPI_SS); |
|
// Read from registers |
always @(wb_adr_i or rx or ctrl or divider or ss) |
begin |
case (wb_adr_i[`SPI_OFS_BITS]) |
`ifdef SPI_MAX_CHAR_128 |
`SPI_RX_0: wb_dat = rx[31:0]; |
`SPI_RX_1: wb_dat = rx[63:32]; |
`SPI_RX_2: wb_dat = rx[95:64]; |
`SPI_RX_3: wb_dat = {{128-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:96]}; |
`else |
`ifdef SPI_MAX_CHAR_64 |
`SPI_RX_0: wb_dat = rx[31:0]; |
`SPI_RX_1: wb_dat = {{64-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:32]}; |
`SPI_RX_2: wb_dat = 32'b0; |
`SPI_RX_3: wb_dat = 32'b0; |
`else |
`SPI_RX_0: wb_dat = {{32-`SPI_MAX_CHAR{1'b0}}, rx[`SPI_MAX_CHAR-1:0]}; |
`SPI_RX_1: wb_dat = 32'b0; |
`SPI_RX_2: wb_dat = 32'b0; |
`SPI_RX_3: wb_dat = 32'b0; |
`endif |
`endif |
`SPI_CTRL: wb_dat = {{32-`SPI_CTRL_BIT_NB{1'b0}}, ctrl}; |
`SPI_DEVIDE: wb_dat = {{32-`SPI_DIVIDER_LEN{1'b0}}, divider}; |
`SPI_SS: wb_dat = {{32-`SPI_SS_NB{1'b0}}, ss}; |
default: wb_dat = 32'bx; |
endcase |
end |
|
// Wb data out |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
wb_dat_o <= #Tp 32'b0; |
else |
wb_dat_o <= #Tp wb_dat; |
end |
|
// Wb acknowledge |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
wb_ack_o <= #Tp 1'b0; |
else |
wb_ack_o <= #Tp wb_cyc_i & wb_stb_i & ~wb_ack_o; |
end |
|
// Wb error |
assign wb_err_o = 1'b0; |
|
// Interrupt |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
wb_int_o <= #Tp 1'b0; |
else if (ie && tip && last_bit && pos_edge) |
wb_int_o <= #Tp 1'b1; |
else if (wb_ack_o) |
wb_int_o <= #Tp 1'b0; |
end |
|
// Divider register |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
divider <= #Tp {`SPI_DIVIDER_LEN{1'b0}}; |
else if (spi_divider_sel && wb_we_i && !tip) |
begin |
`ifdef SPI_DIVIDER_LEN_8 |
if (wb_sel_i[0]) |
divider <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:0]; |
`endif |
`ifdef SPI_DIVIDER_LEN_16 |
if (wb_sel_i[0]) |
divider[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
divider[`SPI_DIVIDER_LEN-1:8] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:8]; |
`endif |
`ifdef SPI_DIVIDER_LEN_24 |
if (wb_sel_i[0]) |
divider[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
divider[15:8] <= #Tp wb_dat_i[15:8]; |
if (wb_sel_i[2]) |
divider[`SPI_DIVIDER_LEN-1:16] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:16]; |
`endif |
`ifdef SPI_DIVIDER_LEN_32 |
if (wb_sel_i[0]) |
divider[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
divider[15:8] <= #Tp wb_dat_i[15:8]; |
if (wb_sel_i[2]) |
divider[23:16] <= #Tp wb_dat_i[23:16]; |
if (wb_sel_i[3]) |
divider[`SPI_DIVIDER_LEN-1:24] <= #Tp wb_dat_i[`SPI_DIVIDER_LEN-1:24]; |
`endif |
end |
end |
|
// Ctrl register |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
ctrl <= #Tp {`SPI_CTRL_BIT_NB{1'b0}}; |
else if(spi_ctrl_sel && wb_we_i && !tip) |
begin |
if (wb_sel_i[0]) |
ctrl[7:0] <= #Tp wb_dat_i[7:0] | {7'b0, ctrl[0]}; |
if (wb_sel_i[1]) |
ctrl[`SPI_CTRL_BIT_NB-1:8] <= #Tp wb_dat_i[`SPI_CTRL_BIT_NB-1:8]; |
end |
else if(tip && last_bit && pos_edge) |
ctrl[`SPI_CTRL_GO] <= #Tp 1'b0; |
end |
|
assign rx_negedge = ctrl[`SPI_CTRL_RX_NEGEDGE]; |
assign tx_negedge = ctrl[`SPI_CTRL_TX_NEGEDGE]; |
assign go = ctrl[`SPI_CTRL_GO]; |
assign char_len = ctrl[`SPI_CTRL_CHAR_LEN]; |
assign lsb = ctrl[`SPI_CTRL_LSB]; |
assign ie = ctrl[`SPI_CTRL_IE]; |
assign ass = ctrl[`SPI_CTRL_ASS]; |
|
// Slave select register |
always @(posedge wb_clk_i or posedge wb_rst_i) |
begin |
if (wb_rst_i) |
ss <= #Tp {`SPI_SS_NB{1'b0}}; |
else if(spi_ss_sel && wb_we_i && !tip) |
begin |
`ifdef SPI_SS_NB_8 |
if (wb_sel_i[0]) |
ss <= #Tp wb_dat_i[`SPI_SS_NB-1:0]; |
`endif |
`ifdef SPI_SS_NB_16 |
if (wb_sel_i[0]) |
ss[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
ss[`SPI_SS_NB-1:8] <= #Tp wb_dat_i[`SPI_SS_NB-1:8]; |
`endif |
`ifdef SPI_SS_NB_24 |
if (wb_sel_i[0]) |
ss[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
ss[15:8] <= #Tp wb_dat_i[15:8]; |
if (wb_sel_i[2]) |
ss[`SPI_SS_NB-1:16] <= #Tp wb_dat_i[`SPI_SS_NB-1:16]; |
`endif |
`ifdef SPI_SS_NB_32 |
if (wb_sel_i[0]) |
ss[7:0] <= #Tp wb_dat_i[7:0]; |
if (wb_sel_i[1]) |
ss[15:8] <= #Tp wb_dat_i[15:8]; |
if (wb_sel_i[2]) |
ss[23:16] <= #Tp wb_dat_i[23:16]; |
if (wb_sel_i[3]) |
ss[`SPI_SS_NB-1:24] <= #Tp wb_dat_i[`SPI_SS_NB-1:24]; |
`endif |
end |
end |
|
assign ss_pad_o = ~((ss & {`SPI_SS_NB{tip & ass}}) | (ss & {`SPI_SS_NB{!ass}})); |
|
spi_clgen clgen (.clk_in(wb_clk_i), .rst(wb_rst_i), .go(go), .enable(tip), .last_clk(last_bit), |
.divider(divider), .clk_out(sclk_pad_o), .pos_edge(pos_edge), |
.neg_edge(neg_edge)); |
|
spi_shift shift (.clk(wb_clk_i), .rst(wb_rst_i), .len(char_len[`SPI_CHAR_LEN_BITS-1:0]), |
.latch(spi_tx_sel[3:0] & {4{wb_we_i}}), .byte_sel(wb_sel_i), .lsb(lsb), |
.go(go), .pos_edge(pos_edge), .neg_edge(neg_edge), |
.rx_negedge(rx_negedge), .tx_negedge(tx_negedge), |
.tip(tip), .last(last_bit), |
.p_in(wb_dat_i), .p_out(rx), |
.s_clk(sclk_pad_o), .s_in(miso_pad_i), .s_out(mosi_pad_o)); |
endmodule |
|
/tags/asyst_2/rtl/verilog/spi_shift.v
0,0 → 1,238
////////////////////////////////////////////////////////////////////// |
//// //// |
//// spi_shift.v //// |
//// //// |
//// This file is part of the SPI IP core project //// |
//// http://www.opencores.org/projects/spi/ //// |
//// //// |
//// Author(s): //// |
//// - Simon Srot (simons@opencores.org) //// |
//// //// |
//// All additional information is avaliable in the Readme.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002 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 //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
|
`include "spi_defines.v" |
`include "timescale.v" |
|
module spi_shift (clk, rst, latch, byte_sel, len, lsb, go, |
pos_edge, neg_edge, rx_negedge, tx_negedge, |
tip, last, |
p_in, p_out, s_clk, s_in, s_out); |
|
parameter Tp = 1; |
|
input clk; // system clock |
input rst; // reset |
input [3:0] latch; // latch signal for storing the data in shift register |
input [3:0] byte_sel; // byte select signals for storing the data in shift register |
input [`SPI_CHAR_LEN_BITS-1:0] len; // data len in bits (minus one) |
input lsb; // lbs first on the line |
input go; // start stansfer |
input pos_edge; // recognize posedge of sclk |
input neg_edge; // recognize negedge of sclk |
input rx_negedge; // s_in is sampled on negative edge |
input tx_negedge; // s_out is driven on negative edge |
output tip; // transfer in progress |
output last; // last bit |
input [31:0] p_in; // parallel in |
output [`SPI_MAX_CHAR-1:0] p_out; // parallel out |
input s_clk; // serial clock |
input s_in; // serial in |
output s_out; // serial out |
|
reg s_out; |
reg tip; |
|
reg [`SPI_CHAR_LEN_BITS:0] cnt; // data bit count |
reg [`SPI_MAX_CHAR-1:0] data; // shift register |
wire [`SPI_CHAR_LEN_BITS:0] tx_bit_pos; // next bit position |
wire [`SPI_CHAR_LEN_BITS:0] rx_bit_pos; // next bit position |
wire rx_clk; // rx clock enable |
wire tx_clk; // tx clock enable |
|
assign p_out = data; |
|
assign tx_bit_pos = lsb ? {!(|len), len} - cnt : cnt - {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1}; |
assign rx_bit_pos = lsb ? {!(|len), len} - (rx_negedge ? cnt + {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1} : cnt) : |
(rx_negedge ? cnt : cnt - {{`SPI_CHAR_LEN_BITS{1'b0}},1'b1}); |
|
assign last = !(|cnt); |
|
assign rx_clk = (rx_negedge ? neg_edge : pos_edge) && (!last || s_clk); |
assign tx_clk = (tx_negedge ? neg_edge : pos_edge) && !last; |
|
// Character bit counter |
always @(posedge clk or posedge rst) |
begin |
if(rst) |
cnt <= #Tp {`SPI_CHAR_LEN_BITS+1{1'b0}}; |
else |
begin |
if(tip) |
cnt <= #Tp pos_edge ? (cnt - {{`SPI_CHAR_LEN_BITS{1'b0}}, 1'b1}) : cnt; |
else |
cnt <= #Tp !(|len) ? {1'b1, {`SPI_CHAR_LEN_BITS{1'b0}}} : {1'b0, len}; |
end |
end |
|
// Transfer in progress |
always @(posedge clk or posedge rst) |
begin |
if(rst) |
tip <= #Tp 1'b0; |
else if(go && ~tip) |
tip <= #Tp 1'b1; |
else if(tip && last && pos_edge) |
tip <= #Tp 1'b0; |
end |
|
// Sending bits to the line |
always @(posedge clk or posedge rst) |
begin |
if (rst) |
s_out <= #Tp 1'b0; |
else |
s_out <= #Tp (tx_clk || !tip) ? data[tx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] : s_out; |
end |
|
// Receiving bits from the line |
always @(posedge clk or posedge rst) |
begin |
if (rst) |
data <= #Tp {`SPI_MAX_CHAR{1'b0}}; |
`ifdef SPI_MAX_CHAR_128 |
else if (latch[0] && !tip) |
begin |
if (byte_sel[3]) |
data[31:24] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[23:16] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[15:8] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[7:0] <= #Tp p_in[7:0]; |
end |
else if (latch[1] && !tip) |
begin |
if (byte_sel[3]) |
data[63:56] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[55:48] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[47:40] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[39:32] <= #Tp p_in[7:0]; |
end |
else if (latch[2] && !tip) |
begin |
if (byte_sel[3]) |
data[95:88] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[87:80] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[79:72] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[71:64] <= #Tp p_in[7:0]; |
end |
else if (latch[3] && !tip) |
begin |
if (byte_sel[3]) |
data[127:120] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[119:112] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[111:104] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[103:96] <= #Tp p_in[7:0]; |
end |
`else |
`ifdef SPI_MAX_CHAR_64 |
else if (latch[0] && !tip) |
begin |
if (byte_sel[3]) |
data[31:24] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[23:16] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[15:8] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[7:0] <= #Tp p_in[7:0]; |
end |
else if (latch[1] && !tip) |
begin |
if (byte_sel[3]) |
data[63:56] <= #Tp p_in[31:24]; |
if (byte_sel[2]) |
data[55:48] <= #Tp p_in[23:16]; |
if (byte_sel[1]) |
data[47:40] <= #Tp p_in[15:8]; |
if (byte_sel[0]) |
data[39:32] <= #Tp p_in[7:0]; |
end |
`else |
else if (latch[0] && !tip) |
begin |
`ifdef SPI_MAX_CHAR_8 |
if (byte_sel[0]) |
data[`SPI_MAX_CHAR-1:0] <= #Tp p_in[`SPI_MAX_CHAR-1:0]; |
`endif |
`ifdef SPI_MAX_CHAR_16 |
if (byte_sel[0]) |
data[7:0] <= #Tp p_in[7:0]; |
if (byte_sel[1]) |
data[`SPI_MAX_CHAR-1:8] <= #Tp p_in[`SPI_MAX_CHAR-1:8]; |
`endif |
`ifdef SPI_MAX_CHAR_24 |
if (byte_sel[0]) |
data[7:0] <= #Tp p_in[7:0]; |
if (byte_sel[1]) |
data[15:8] <= #Tp p_in[15:8]; |
if (byte_sel[2]) |
data[`SPI_MAX_CHAR-1:16] <= #Tp p_in[`SPI_MAX_CHAR-1:16]; |
`endif |
`ifdef SPI_MAX_CHAR_32 |
if (byte_sel[0]) |
data[7:0] <= #Tp p_in[7:0]; |
if (byte_sel[1]) |
data[15:8] <= #Tp p_in[15:8]; |
if (byte_sel[2]) |
data[23:16] <= #Tp p_in[23:16]; |
if (byte_sel[3]) |
data[`SPI_MAX_CHAR-1:24] <= #Tp p_in[`SPI_MAX_CHAR-1:24]; |
`endif |
end |
`endif |
`endif |
else |
data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]] <= #Tp rx_clk ? s_in : data[rx_bit_pos[`SPI_CHAR_LEN_BITS-1:0]]; |
end |
|
endmodule |
|
/tags/asyst_2/rtl/verilog/spi_defines.v
0,0 → 1,158
////////////////////////////////////////////////////////////////////// |
//// //// |
//// spi_define.v //// |
//// //// |
//// This file is part of the SPI IP core project //// |
//// http://www.opencores.org/projects/spi/ //// |
//// //// |
//// Author(s): //// |
//// - Simon Srot (simons@opencores.org) //// |
//// //// |
//// All additional information is avaliable in the Readme.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002 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 //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
|
// |
// Number of bits used for devider register. If used in system with |
// low frequency of system clock this can be reduced. |
// Use SPI_DIVIDER_LEN for fine tuning theexact number. |
// |
//`define SPI_DIVIDER_LEN_8 |
`define SPI_DIVIDER_LEN_16 |
//`define SPI_DIVIDER_LEN_24 |
//`define SPI_DIVIDER_LEN_32 |
|
`ifdef SPI_DIVIDER_LEN_8 |
`define SPI_DIVIDER_LEN 8 // Can be set from 1 to 8 |
`endif |
`ifdef SPI_DIVIDER_LEN_16 |
`define SPI_DIVIDER_LEN 16 // Can be set from 9 to 16 |
`endif |
`ifdef SPI_DIVIDER_LEN_24 |
`define SPI_DIVIDER_LEN 24 // Can be set from 17 to 24 |
`endif |
`ifdef SPI_DIVIDER_LEN_32 |
`define SPI_DIVIDER_LEN 32 // Can be set from 25 to 32 |
`endif |
|
// |
// Maximum nuber of bits that can be send/received at once. |
// Use SPI_MAX_CHAR for fine tuning the exact number, when using |
// SPI_MAX_CHAR_32, SPI_MAX_CHAR_24, SPI_MAX_CHAR_16, SPI_MAX_CHAR_8. |
// |
`define SPI_MAX_CHAR_128 |
//`define SPI_MAX_CHAR_64 |
//`define SPI_MAX_CHAR_32 |
//`define SPI_MAX_CHAR_24 |
//`define SPI_MAX_CHAR_16 |
//`define SPI_MAX_CHAR_8 |
|
`ifdef SPI_MAX_CHAR_128 |
`define SPI_MAX_CHAR 128 // Can only be set to 128 |
`define SPI_CHAR_LEN_BITS 7 |
`endif |
`ifdef SPI_MAX_CHAR_64 |
`define SPI_MAX_CHAR 64 // Can only be set to 64 |
`define SPI_CHAR_LEN_BITS 6 |
`endif |
`ifdef SPI_MAX_CHAR_32 |
`define SPI_MAX_CHAR 32 // Can be set from 25 to 32 |
`define SPI_CHAR_LEN_BITS 5 |
`endif |
`ifdef SPI_MAX_CHAR_24 |
`define SPI_MAX_CHAR 24 // Can be set from 17 to 24 |
`define SPI_CHAR_LEN_BITS 5 |
`endif |
`ifdef SPI_MAX_CHAR_16 |
`define SPI_MAX_CHAR 16 // Can be set from 9 to 16 |
`define SPI_CHAR_LEN_BITS 4 |
`endif |
`ifdef SPI_MAX_CHAR_8 |
`define SPI_MAX_CHAR 8 // Can be set from 1 to 8 |
`define SPI_CHAR_LEN_BITS 3 |
`endif |
|
// |
// Number of device select signals. Use SPI_SS_NB for fine tuning the |
// exact number. |
// |
`define SPI_SS_NB_8 |
//`define SPI_SS_NB_16 |
//`define SPI_SS_NB_24 |
//`define SPI_SS_NB_32 |
|
`ifdef SPI_SS_NB_8 |
`define SPI_SS_NB 8 // Can be set from 1 to 8 |
`endif |
`ifdef SPI_SS_NB_16 |
`define SPI_SS_NB 16 // Can be set from 9 to 16 |
`endif |
`ifdef SPI_SS_NB_24 |
`define SPI_SS_NB 24 // Can be set from 17 to 24 |
`endif |
`ifdef SPI_SS_NB_32 |
`define SPI_SS_NB 32 // Can be set from 25 to 32 |
`endif |
|
// |
// Bits of WISHBONE address used for partial decoding of SPI registers. |
// |
`define SPI_OFS_BITS 4:2 |
|
// |
// Register offset |
// |
`define SPI_RX_0 0 |
`define SPI_RX_1 1 |
`define SPI_RX_2 2 |
`define SPI_RX_3 3 |
`define SPI_TX_0 0 |
`define SPI_TX_1 1 |
`define SPI_TX_2 2 |
`define SPI_TX_3 3 |
`define SPI_CTRL 4 |
`define SPI_DEVIDE 5 |
`define SPI_SS 6 |
|
// |
// Number of bits in ctrl register |
// |
`define SPI_CTRL_BIT_NB 13 |
|
// |
// Control register bit position |
// |
`define SPI_CTRL_ASS 12 |
`define SPI_CTRL_IE 11 |
`define SPI_CTRL_LSB 10 |
`define SPI_CTRL_CHAR_LEN 9:3 |
`define SPI_CTRL_TX_NEGEDGE 2 |
`define SPI_CTRL_RX_NEGEDGE 1 |
`define SPI_CTRL_GO 0 |
|
/tags/asyst_2/rtl/verilog/spi_clgen.v
0,0 → 1,108
////////////////////////////////////////////////////////////////////// |
//// //// |
//// spi_clgen.v //// |
//// //// |
//// This file is part of the SPI IP core project //// |
//// http://www.opencores.org/projects/spi/ //// |
//// //// |
//// Author(s): //// |
//// - Simon Srot (simons@opencores.org) //// |
//// //// |
//// All additional information is avaliable in the Readme.txt //// |
//// file. //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
//// //// |
//// Copyright (C) 2002 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 //// |
//// //// |
////////////////////////////////////////////////////////////////////// |
|
`include "spi_defines.v" |
`include "timescale.v" |
|
module spi_clgen (clk_in, rst, go, enable, last_clk, divider, clk_out, pos_edge, neg_edge); |
|
parameter Tp = 1; |
|
input clk_in; // input clock (system clock) |
input rst; // reset |
input enable; // clock enable |
input go; // start transfer |
input last_clk; // last clock |
input [`SPI_DIVIDER_LEN-1:0] divider; // clock divider (output clock is divided by this value) |
output clk_out; // output clock |
output pos_edge; // pulse marking positive edge of clk_out |
output neg_edge; // pulse marking negative edge of clk_out |
|
reg clk_out; |
reg pos_edge; |
reg neg_edge; |
|
reg [`SPI_DIVIDER_LEN-1:0] cnt; // clock counter |
wire cnt_zero; // conter is equal to zero |
wire cnt_one; // conter is equal to one |
|
|
assign cnt_zero = cnt == {`SPI_DIVIDER_LEN{1'b0}}; |
assign cnt_one = cnt == {{`SPI_DIVIDER_LEN-1{1'b0}}, 1'b1}; |
|
// Counter counts half period |
always @(posedge clk_in or posedge rst) |
begin |
if(rst) |
cnt <= #Tp {`SPI_DIVIDER_LEN{1'b1}}; |
else |
begin |
if(!enable || cnt_zero) |
cnt <= #Tp divider; |
else |
cnt <= #Tp cnt - {{`SPI_DIVIDER_LEN-1{1'b0}}, 1'b1}; |
end |
end |
|
// clk_out is asserted every other half period |
always @(posedge clk_in or posedge rst) |
begin |
if(rst) |
clk_out <= #Tp 1'b0; |
else |
clk_out <= #Tp (enable && cnt_zero && (!last_clk || clk_out)) ? ~clk_out : clk_out; |
end |
|
// Pos and neg edge signals |
always @(posedge clk_in or posedge rst) |
begin |
if(rst) |
begin |
pos_edge <= #Tp 1'b0; |
neg_edge <= #Tp 1'b0; |
end |
else |
begin |
pos_edge <= #Tp (enable && !clk_out && cnt_one) || (!(|divider) && clk_out) || (!(|divider) && go && !enable); |
neg_edge <= #Tp (enable && clk_out && cnt_one) || (!(|divider) && !clk_out && enable); |
end |
end |
endmodule |
|
/tags/asyst_2/rtl/verilog/timescale.v
0,0 → 1,2
`timescale 1ns / 10ps |
|