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/verilog/uart_regs.v
0,0 → 1,897
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_regs.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// Registers of the uart 16550 core ////
//// ////
//// Known problems (limits): ////
//// Inserts 1 wait state in all WISHBONE transfers ////
//// ////
//// To Do: ////
//// Nothing or verification. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: (See log for the revision history ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.42 2004/11/22 09:21:59 igorm
// Timeout interrupt should be generated only when there is at least ony
// character in the fifo.
//
// Revision 1.41 2004/05/21 11:44:41 tadejm
// Added synchronizer flops for RX input.
//
// Revision 1.40 2003/06/11 16:37:47 gorban
// This fixes errors in some cases when data is being read and put to the FIFO at the same time. Patch is submitted by Scott Furman. Update is very recommended.
//
// Revision 1.39 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.38 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.37 2001/12/27 13:24:09 mohor
// lsr[7] was not showing overrun errors.
//
// Revision 1.36 2001/12/20 13:25:46 mohor
// rx push changed to be only one cycle wide.
//
// Revision 1.35 2001/12/19 08:03:34 mohor
// Warnings cleared.
//
// Revision 1.34 2001/12/19 07:33:54 mohor
// Synplicity was having troubles with the comment.
//
// Revision 1.33 2001/12/17 10:14:43 mohor
// Things related to msr register changed. After THRE IRQ occurs, and one
// character is written to the transmit fifo, the detection of the THRE bit in the
// LSR is delayed for one character time.
//
// Revision 1.32 2001/12/14 13:19:24 mohor
// MSR register fixed.
//
// Revision 1.31 2001/12/14 10:06:58 mohor
// After reset modem status register MSR should be reset.
//
// Revision 1.30 2001/12/13 10:09:13 mohor
// thre irq should be cleared only when being source of interrupt.
//
// Revision 1.29 2001/12/12 09:05:46 mohor
// LSR status bit 0 was not cleared correctly in case of reseting the FCR (rx fifo).
//
// Revision 1.28 2001/12/10 19:52:41 gorban
// Scratch register added
//
// Revision 1.27 2001/12/06 14:51:04 gorban
// Bug in LSR[0] is fixed.
// All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.
//
// Revision 1.26 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.25 2001/11/28 19:36:39 gorban
// Fixed: timeout and break didn't pay attention to current data format when counting time
//
// Revision 1.24 2001/11/26 21:38:54 gorban
// Lots of fixes:
// Break condition wasn't handled correctly at all.
// LSR bits could lose their values.
// LSR value after reset was wrong.
// Timing of THRE interrupt signal corrected.
// LSR bit 0 timing corrected.
//
// Revision 1.23 2001/11/12 21:57:29 gorban
// fixed more typo bugs
//
// Revision 1.22 2001/11/12 15:02:28 mohor
// lsr1r error fixed.
//
// Revision 1.21 2001/11/12 14:57:27 mohor
// ti_int_pnd error fixed.
//
// Revision 1.20 2001/11/12 14:50:27 mohor
// ti_int_d error fixed.
//
// Revision 1.19 2001/11/10 12:43:21 gorban
// Logic Synthesis bugs fixed. Some other minor changes
//
// Revision 1.18 2001/11/08 14:54:23 mohor
// Comments in Slovene language deleted, few small fixes for better work of
// old tools. IRQs need to be fix.
//
// Revision 1.17 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.16 2001/11/02 09:55:16 mohor
// no message
//
// Revision 1.15 2001/10/31 15:19:22 gorban
// Fixes to break and timeout conditions
//
// Revision 1.14 2001/10/29 17:00:46 gorban
// fixed parity sending and tx_fifo resets over- and underrun
//
// Revision 1.13 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.12 2001/10/19 16:21:40 gorban
// Changes data_out to be synchronous again as it should have been.
//
// Revision 1.11 2001/10/18 20:35:45 gorban
// small fix
//
// Revision 1.10 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.9 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.10 2001/06/23 11:21:48 gorban
// DL made 16-bit long. Fixed transmission/reception bugs.
//
// Revision 1.9 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.8 2001/05/29 20:05:04 gorban
// Fixed some bugs and synthesis problems.
//
// Revision 1.7 2001/05/27 17:37:49 gorban
// Fixed many bugs. Updated spec. Changed FIFO files structure. See CHANGES.txt file.
//
// Revision 1.6 2001/05/21 19:12:02 gorban
// Corrected some Linter messages.
//
// Revision 1.5 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:11+02 jacob
// Initial revision
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
`define UART_DL1 7:0
`define UART_DL2 15:8
 
module uart_regs (clk,
wb_rst_i, wb_addr_i, wb_dat_i, wb_dat_o, wb_we_i, wb_re_i,
 
// additional signals
modem_inputs,
stx_pad_o, srx_pad_i,
 
`ifdef DATA_BUS_WIDTH_8
`else
// debug interface signals enabled
ier, iir, fcr, mcr, lcr, msr, lsr, rf_count, tf_count, tstate, rstate,
`endif
rts_pad_o, dtr_pad_o, int_o
`ifdef UART_HAS_BAUDRATE_OUTPUT
, baud_o
`endif
 
);
 
input clk;
input wb_rst_i;
input [`UART_ADDR_WIDTH-1:0] wb_addr_i;
input [7:0] wb_dat_i;
output [7:0] wb_dat_o;
input wb_we_i;
input wb_re_i;
 
output stx_pad_o;
input srx_pad_i;
 
input [3:0] modem_inputs;
output rts_pad_o;
output dtr_pad_o;
output int_o;
`ifdef UART_HAS_BAUDRATE_OUTPUT
output baud_o;
`endif
 
`ifdef DATA_BUS_WIDTH_8
`else
// if 32-bit databus and debug interface are enabled
output [3:0] ier;
output [3:0] iir;
output [1:0] fcr; /// bits 7 and 6 of fcr. Other bits are ignored
output [4:0] mcr;
output [7:0] lcr;
output [7:0] msr;
output [7:0] lsr;
output [`UART_FIFO_COUNTER_W-1:0] rf_count;
output [`UART_FIFO_COUNTER_W-1:0] tf_count;
output [2:0] tstate;
output [3:0] rstate;
 
`endif
 
wire [3:0] modem_inputs;
reg enable;
`ifdef UART_HAS_BAUDRATE_OUTPUT
assign baud_o = enable; // baud_o is actually the enable signal
`endif
 
 
wire stx_pad_o; // received from transmitter module
wire srx_pad_i;
wire srx_pad;
 
reg [7:0] wb_dat_o;
 
wire [`UART_ADDR_WIDTH-1:0] wb_addr_i;
wire [7:0] wb_dat_i;
 
 
reg [3:0] ier;
reg [3:0] iir;
reg [1:0] fcr; /// bits 7 and 6 of fcr. Other bits are ignored
reg [4:0] mcr;
reg [7:0] lcr;
reg [7:0] msr;
reg [15:0] dl; // 32-bit divisor latch
reg [7:0] scratch; // UART scratch register
reg start_dlc; // activate dlc on writing to UART_DL1
reg lsr_mask_d; // delay for lsr_mask condition
reg msi_reset; // reset MSR 4 lower bits indicator
//reg threi_clear; // THRE interrupt clear flag
reg [15:0] dlc; // 32-bit divisor latch counter
reg int_o;
 
reg [3:0] trigger_level; // trigger level of the receiver FIFO
reg rx_reset;
reg tx_reset;
 
wire dlab; // divisor latch access bit
wire cts_pad_i, dsr_pad_i, ri_pad_i, dcd_pad_i; // modem status bits
wire loopback; // loopback bit (MCR bit 4)
wire cts, dsr, ri, dcd; // effective signals
wire cts_c, dsr_c, ri_c, dcd_c; // Complement effective signals (considering loopback)
wire rts_pad_o, dtr_pad_o; // modem control outputs
 
// LSR bits wires and regs
wire [7:0] lsr;
wire lsr0, lsr1, lsr2, lsr3, lsr4, lsr5, lsr6, lsr7;
reg lsr0r, lsr1r, lsr2r, lsr3r, lsr4r, lsr5r, lsr6r, lsr7r;
wire lsr_mask; // lsr_mask
 
//
// ASSINGS
//
 
assign lsr[7:0] = { lsr7r, lsr6r, lsr5r, lsr4r, lsr3r, lsr2r, lsr1r, lsr0r };
 
assign {cts_pad_i, dsr_pad_i, ri_pad_i, dcd_pad_i} = modem_inputs;
assign {cts, dsr, ri, dcd} = ~{cts_pad_i,dsr_pad_i,ri_pad_i,dcd_pad_i};
 
assign {cts_c, dsr_c, ri_c, dcd_c} = loopback ? {mcr[`UART_MC_RTS],mcr[`UART_MC_DTR],mcr[`UART_MC_OUT1],mcr[`UART_MC_OUT2]}
: {cts_pad_i,dsr_pad_i,ri_pad_i,dcd_pad_i};
 
assign dlab = lcr[`UART_LC_DL];
assign loopback = mcr[4];
 
// assign modem outputs
assign rts_pad_o = mcr[`UART_MC_RTS];
assign dtr_pad_o = mcr[`UART_MC_DTR];
 
// Interrupt signals
wire rls_int; // receiver line status interrupt
wire rda_int; // receiver data available interrupt
wire ti_int; // timeout indicator interrupt
wire thre_int; // transmitter holding register empty interrupt
wire ms_int; // modem status interrupt
 
// FIFO signals
reg tf_push;
reg rf_pop;
wire [`UART_FIFO_REC_WIDTH-1:0] rf_data_out;
wire rf_error_bit; // an error (parity or framing) is inside the fifo
wire [`UART_FIFO_COUNTER_W-1:0] rf_count;
wire [`UART_FIFO_COUNTER_W-1:0] tf_count;
wire [2:0] tstate;
wire [3:0] rstate;
wire [9:0] counter_t;
 
wire thre_set_en; // THRE status is delayed one character time when a character is written to fifo.
reg [7:0] block_cnt; // While counter counts, THRE status is blocked (delayed one character cycle)
reg [7:0] block_value; // One character length minus stop bit
 
// Transmitter Instance
wire serial_out;
 
uart_transmitter transmitter(clk, wb_rst_i, lcr, tf_push, wb_dat_i, enable, serial_out, tstate, tf_count, tx_reset, lsr_mask);
 
// Synchronizing and sampling serial RX input
uart_sync_flops i_uart_sync_flops
(
.rst_i (wb_rst_i),
.clk_i (clk),
.stage1_rst_i (1'b0),
.stage1_clk_en_i (1'b1),
.async_dat_i (srx_pad_i),
.sync_dat_o (srx_pad)
);
defparam i_uart_sync_flops.width = 1;
defparam i_uart_sync_flops.init_value = 1'b1;
 
// handle loopback
wire serial_in = loopback ? serial_out : srx_pad;
assign stx_pad_o = loopback ? 1'b1 : serial_out;
 
// Receiver Instance
uart_receiver receiver(clk, wb_rst_i, lcr, rf_pop, serial_in, enable,
counter_t, rf_count, rf_data_out, rf_error_bit, rf_overrun, rx_reset, lsr_mask, rstate, rf_push_pulse);
 
 
// Asynchronous reading here because the outputs are sampled in uart_wb.v file
always @(dl or dlab or ier or iir or scratch
or lcr or lsr or msr or rf_data_out or wb_addr_i or wb_re_i) // asynchrounous reading
begin
case (wb_addr_i)
`UART_REG_RB : wb_dat_o = dlab ? dl[`UART_DL1] : rf_data_out[10:3];
`UART_REG_IE : wb_dat_o = dlab ? dl[`UART_DL2] : ier;
`UART_REG_II : wb_dat_o = {4'b1100,iir};
`UART_REG_LC : wb_dat_o = lcr;
`UART_REG_LS : wb_dat_o = lsr;
`UART_REG_MS : wb_dat_o = msr;
`UART_REG_SR : wb_dat_o = scratch;
default: wb_dat_o = 8'b0; // ??
endcase // case(wb_addr_i)
end // always @ (dl or dlab or ier or iir or scratch...
 
 
// rf_pop signal handling
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
rf_pop <= #1 0;
else
if (rf_pop) // restore the signal to 0 after one clock cycle
rf_pop <= #1 0;
else
if (wb_re_i && wb_addr_i == `UART_REG_RB && !dlab)
rf_pop <= #1 1; // advance read pointer
end
 
wire lsr_mask_condition;
wire iir_read;
wire msr_read;
wire fifo_read;
wire fifo_write;
 
assign lsr_mask_condition = (wb_re_i && wb_addr_i == `UART_REG_LS && !dlab);
assign iir_read = (wb_re_i && wb_addr_i == `UART_REG_II && !dlab);
assign msr_read = (wb_re_i && wb_addr_i == `UART_REG_MS && !dlab);
assign fifo_read = (wb_re_i && wb_addr_i == `UART_REG_RB && !dlab);
assign fifo_write = (wb_we_i && wb_addr_i == `UART_REG_TR && !dlab);
 
// lsr_mask_d delayed signal handling
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
lsr_mask_d <= #1 0;
else // reset bits in the Line Status Register
lsr_mask_d <= #1 lsr_mask_condition;
end
 
// lsr_mask is rise detected
assign lsr_mask = lsr_mask_condition && ~lsr_mask_d;
 
// msi_reset signal handling
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
msi_reset <= #1 1;
else
if (msi_reset)
msi_reset <= #1 0;
else
if (msr_read)
msi_reset <= #1 1; // reset bits in Modem Status Register
end
 
 
//
// WRITES AND RESETS //
//
// Line Control Register
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
lcr <= #1 8'b00000011; // 8n1 setting
else
if (wb_we_i && wb_addr_i==`UART_REG_LC)
lcr <= #1 wb_dat_i;
 
// Interrupt Enable Register or UART_DL2
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
begin
ier <= #1 4'b0000; // no interrupts after reset
dl[`UART_DL2] <= #1 8'b0;
end
else
if (wb_we_i && wb_addr_i==`UART_REG_IE)
if (dlab)
begin
dl[`UART_DL2] <= #1 wb_dat_i;
end
else
ier <= #1 wb_dat_i[3:0]; // ier uses only 4 lsb
 
 
// FIFO Control Register and rx_reset, tx_reset signals
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) begin
fcr <= #1 2'b11;
rx_reset <= #1 0;
tx_reset <= #1 0;
end else
if (wb_we_i && wb_addr_i==`UART_REG_FC) begin
fcr <= #1 wb_dat_i[7:6];
rx_reset <= #1 wb_dat_i[1];
tx_reset <= #1 wb_dat_i[2];
end else begin
rx_reset <= #1 0;
tx_reset <= #1 0;
end
 
// Modem Control Register
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
mcr <= #1 5'b0;
else
if (wb_we_i && wb_addr_i==`UART_REG_MC)
mcr <= #1 wb_dat_i[4:0];
 
// Scratch register
// Line Control Register
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
scratch <= #1 0; // 8n1 setting
else
if (wb_we_i && wb_addr_i==`UART_REG_SR)
scratch <= #1 wb_dat_i;
 
// TX_FIFO or UART_DL1
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
begin
dl[`UART_DL1] <= #1 8'b0;
tf_push <= #1 1'b0;
start_dlc <= #1 1'b0;
end
else
if (wb_we_i && wb_addr_i==`UART_REG_TR)
if (dlab)
begin
dl[`UART_DL1] <= #1 wb_dat_i;
start_dlc <= #1 1'b1; // enable DL counter
tf_push <= #1 1'b0;
end
else
begin
tf_push <= #1 1'b1;
start_dlc <= #1 1'b0;
end // else: !if(dlab)
else
begin
start_dlc <= #1 1'b0;
tf_push <= #1 1'b0;
end // else: !if(dlab)
 
// Receiver FIFO trigger level selection logic (asynchronous mux)
always @(fcr)
case (fcr[`UART_FC_TL])
2'b00 : trigger_level = 1;
2'b01 : trigger_level = 4;
2'b10 : trigger_level = 8;
2'b11 : trigger_level = 14;
endcase // case(fcr[`UART_FC_TL])
//
// STATUS REGISTERS //
//
 
// Modem Status Register
reg [3:0] delayed_modem_signals;
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
begin
msr <= #1 0;
delayed_modem_signals[3:0] <= #1 0;
end
else begin
msr[`UART_MS_DDCD:`UART_MS_DCTS] <= #1 msi_reset ? 4'b0 :
msr[`UART_MS_DDCD:`UART_MS_DCTS] | ({dcd, ri, dsr, cts} ^ delayed_modem_signals[3:0]);
msr[`UART_MS_CDCD:`UART_MS_CCTS] <= #1 {dcd_c, ri_c, dsr_c, cts_c};
delayed_modem_signals[3:0] <= #1 {dcd, ri, dsr, cts};
end
end
 
 
// Line Status Register
 
// activation conditions
assign lsr0 = (rf_count==0 && rf_push_pulse); // data in receiver fifo available set condition
assign lsr1 = rf_overrun; // Receiver overrun error
assign lsr2 = rf_data_out[1]; // parity error bit
assign lsr3 = rf_data_out[0]; // framing error bit
assign lsr4 = rf_data_out[2]; // break error in the character
assign lsr5 = (tf_count==5'b0 && thre_set_en); // transmitter fifo is empty
assign lsr6 = (tf_count==5'b0 && thre_set_en && (tstate == /*`S_IDLE */ 0)); // transmitter empty
assign lsr7 = rf_error_bit | rf_overrun;
 
// lsr bit0 (receiver data available)
reg lsr0_d;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr0_d <= #1 0;
else lsr0_d <= #1 lsr0;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr0r <= #1 0;
else lsr0r <= #1 (rf_count==1 && rf_pop && !rf_push_pulse || rx_reset) ? 1'b0 : // deassert condition
lsr0r || (lsr0 && ~lsr0_d); // set on rise of lsr0 and keep asserted until deasserted
 
// lsr bit 1 (receiver overrun)
reg lsr1_d; // delayed
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr1_d <= #1 0;
else lsr1_d <= #1 lsr1;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr1r <= #1 0;
else lsr1r <= #1 lsr_mask ? 1'b0 : lsr1r || (lsr1 && ~lsr1_d); // set on rise
 
// lsr bit 2 (parity error)
reg lsr2_d; // delayed
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr2_d <= #1 0;
else lsr2_d <= #1 lsr2;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr2r <= #1 0;
else lsr2r <= #1 lsr_mask ? 1'b0 : lsr2r || (lsr2 && ~lsr2_d); // set on rise
 
// lsr bit 3 (framing error)
reg lsr3_d; // delayed
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr3_d <= #1 0;
else lsr3_d <= #1 lsr3;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr3r <= #1 0;
else lsr3r <= #1 lsr_mask ? 1'b0 : lsr3r || (lsr3 && ~lsr3_d); // set on rise
 
// lsr bit 4 (break indicator)
reg lsr4_d; // delayed
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr4_d <= #1 0;
else lsr4_d <= #1 lsr4;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr4r <= #1 0;
else lsr4r <= #1 lsr_mask ? 1'b0 : lsr4r || (lsr4 && ~lsr4_d);
 
// lsr bit 5 (transmitter fifo is empty)
reg lsr5_d;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr5_d <= #1 1;
else lsr5_d <= #1 lsr5;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr5r <= #1 1;
else lsr5r <= #1 (fifo_write) ? 1'b0 : lsr5r || (lsr5 && ~lsr5_d);
 
// lsr bit 6 (transmitter empty indicator)
reg lsr6_d;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr6_d <= #1 1;
else lsr6_d <= #1 lsr6;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr6r <= #1 1;
else lsr6r <= #1 (fifo_write) ? 1'b0 : lsr6r || (lsr6 && ~lsr6_d);
 
// lsr bit 7 (error in fifo)
reg lsr7_d;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr7_d <= #1 0;
else lsr7_d <= #1 lsr7;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) lsr7r <= #1 0;
else lsr7r <= #1 lsr_mask ? 1'b0 : lsr7r || (lsr7 && ~lsr7_d);
 
// Frequency divider
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
dlc <= #1 0;
else
if (start_dlc | ~ (|dlc))
dlc <= #1 dl - 16'd1; // preset counter
else
dlc <= #1 dlc - 16'd1; // decrement counter
end
 
// Enable signal generation logic
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
enable <= #1 1'b0;
else
if (|dl & ~(|dlc)) // dl>0 & dlc==0
enable <= #1 1'b1;
else
enable <= #1 1'b0;
end
 
// Delaying THRE status for one character cycle after a character is written to an empty fifo.
always @(lcr)
case (lcr[3:0])
4'b0000 : block_value = 95; // 6 bits
4'b0100 : block_value = 103; // 6.5 bits
4'b0001, 4'b1000 : block_value = 111; // 7 bits
4'b1100 : block_value = 119; // 7.5 bits
4'b0010, 4'b0101, 4'b1001 : block_value = 127; // 8 bits
4'b0011, 4'b0110, 4'b1010, 4'b1101 : block_value = 143; // 9 bits
4'b0111, 4'b1011, 4'b1110 : block_value = 159; // 10 bits
4'b1111 : block_value = 175; // 11 bits
endcase // case(lcr[3:0])
 
// Counting time of one character minus stop bit
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
block_cnt <= #1 8'd0;
else
if(lsr5r & fifo_write) // THRE bit set & write to fifo occured
block_cnt <= #1 block_value;
else
if (enable & block_cnt != 8'b0) // only work on enable times
block_cnt <= #1 block_cnt - 8'd1; // decrement break counter
end // always of break condition detection
 
// Generating THRE status enable signal
assign thre_set_en = ~(|block_cnt);
 
 
//
// INTERRUPT LOGIC
//
 
assign rls_int = ier[`UART_IE_RLS] && (lsr[`UART_LS_OE] || lsr[`UART_LS_PE] || lsr[`UART_LS_FE] || lsr[`UART_LS_BI]);
assign rda_int = ier[`UART_IE_RDA] && (rf_count >= {1'b0,trigger_level});
assign thre_int = ier[`UART_IE_THRE] && lsr[`UART_LS_TFE];
assign ms_int = ier[`UART_IE_MS] && (| msr[3:0]);
assign ti_int = ier[`UART_IE_RDA] && (counter_t == 10'b0) && (|rf_count);
 
reg rls_int_d;
reg thre_int_d;
reg ms_int_d;
reg ti_int_d;
reg rda_int_d;
 
// delay lines
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) rls_int_d <= #1 0;
else rls_int_d <= #1 rls_int;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) rda_int_d <= #1 0;
else rda_int_d <= #1 rda_int;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) thre_int_d <= #1 0;
else thre_int_d <= #1 thre_int;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) ms_int_d <= #1 0;
else ms_int_d <= #1 ms_int;
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) ti_int_d <= #1 0;
else ti_int_d <= #1 ti_int;
 
// rise detection signals
 
wire rls_int_rise;
wire thre_int_rise;
wire ms_int_rise;
wire ti_int_rise;
wire rda_int_rise;
 
assign rda_int_rise = rda_int & ~rda_int_d;
assign rls_int_rise = rls_int & ~rls_int_d;
assign thre_int_rise = thre_int & ~thre_int_d;
assign ms_int_rise = ms_int & ~ms_int_d;
assign ti_int_rise = ti_int & ~ti_int_d;
 
// interrupt pending flags
reg rls_int_pnd;
reg rda_int_pnd;
reg thre_int_pnd;
reg ms_int_pnd;
reg ti_int_pnd;
 
// interrupt pending flags assignments
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) rls_int_pnd <= #1 0;
else
rls_int_pnd <= #1 lsr_mask ? 1'b0 : // reset condition
rls_int_rise ? 1'b1 : // latch condition
rls_int_pnd && ier[`UART_IE_RLS]; // default operation: remove if masked
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) rda_int_pnd <= #1 0;
else
rda_int_pnd <= #1 ((rf_count == {1'b0,trigger_level}) && fifo_read) ? 1'b0 : // reset condition
rda_int_rise ? 1'b1 : // latch condition
rda_int_pnd && ier[`UART_IE_RDA]; // default operation: remove if masked
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) thre_int_pnd <= #1 0;
else
thre_int_pnd <= #1 fifo_write || (iir_read & ~iir[`UART_II_IP] & iir[`UART_II_II] == `UART_II_THRE)? 1'b0 :
thre_int_rise ? 1'b1 :
thre_int_pnd && ier[`UART_IE_THRE];
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) ms_int_pnd <= #1 0;
else
ms_int_pnd <= #1 msr_read ? 1'b0 :
ms_int_rise ? 1'b1 :
ms_int_pnd && ier[`UART_IE_MS];
 
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) ti_int_pnd <= #1 0;
else
ti_int_pnd <= #1 fifo_read ? 1'b0 :
ti_int_rise ? 1'b1 :
ti_int_pnd && ier[`UART_IE_RDA];
// end of pending flags
 
// INT_O logic
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
int_o <= #1 1'b0;
else
int_o <= #1
rls_int_pnd ? ~lsr_mask :
rda_int_pnd ? 1'b1 :
ti_int_pnd ? ~fifo_read :
thre_int_pnd ? !(fifo_write & iir_read) :
ms_int_pnd ? ~msr_read :
1'b0; // if no interrupt are pending
end
 
 
// Interrupt Identification register
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
iir <= #1 1;
else
if (rls_int_pnd) // interrupt is pending
begin
iir[`UART_II_II] <= #1 `UART_II_RLS; // set identification register to correct value
iir[`UART_II_IP] <= #1 1'b0; // and clear the IIR bit 0 (interrupt pending)
end else // the sequence of conditions determines priority of interrupt identification
if (rda_int)
begin
iir[`UART_II_II] <= #1 `UART_II_RDA;
iir[`UART_II_IP] <= #1 1'b0;
end
else if (ti_int_pnd)
begin
iir[`UART_II_II] <= #1 `UART_II_TI;
iir[`UART_II_IP] <= #1 1'b0;
end
else if (thre_int_pnd)
begin
iir[`UART_II_II] <= #1 `UART_II_THRE;
iir[`UART_II_IP] <= #1 1'b0;
end
else if (ms_int_pnd)
begin
iir[`UART_II_II] <= #1 `UART_II_MS;
iir[`UART_II_IP] <= #1 1'b0;
end else // no interrupt is pending
begin
iir[`UART_II_II] <= #1 0;
iir[`UART_II_IP] <= #1 1'b1;
end
end
 
endmodule
/verilog/uart_top.v
0,0 → 1,343
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_top.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core top level. ////
//// ////
//// Known problems (limits): ////
//// Note that transmitter and receiver instances are inside ////
//// the uart_regs.v file. ////
//// ////
//// To Do: ////
//// Nothing so far. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.19 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.18 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.17 2001/12/19 08:40:03 mohor
// Warnings fixed (unused signals removed).
//
// Revision 1.16 2001/12/06 14:51:04 gorban
// Bug in LSR[0] is fixed.
// All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.
//
// Revision 1.15 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.14 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.13 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.12 2001/08/25 15:46:19 gorban
// Modified port names again
//
// Revision 1.11 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.10 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.4 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/21 19:12:02 gorban
// Corrected some Linter messages.
//
// Revision 1.2 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:12+02 jacob
// Initial revision
//
//
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_top (
wb_clk_i,
// Wishbone signals
wb_rst_i, wb_adr_i, wb_dat_i, wb_dat_o, wb_we_i, wb_stb_i, wb_cyc_i, wb_ack_o, wb_sel_i,
int_o, // interrupt request
 
// UART signals
// serial input/output
stx_pad_o, srx_pad_i,
 
// modem signals
rts_pad_o, cts_pad_i, dtr_pad_o, dsr_pad_i, ri_pad_i, dcd_pad_i
`ifdef UART_HAS_BAUDRATE_OUTPUT
, baud_o
`endif
);
 
parameter uart_data_width = `UART_DATA_WIDTH;
parameter uart_addr_width = `UART_ADDR_WIDTH;
 
input wb_clk_i;
 
// WISHBONE interface
input wb_rst_i;
input [uart_addr_width-1:0] wb_adr_i;
input [uart_data_width-1:0] wb_dat_i;
output [uart_data_width-1:0] wb_dat_o;
input wb_we_i;
input wb_stb_i;
input wb_cyc_i;
input [3:0] wb_sel_i;
output wb_ack_o;
output int_o;
 
// UART signals
input srx_pad_i;
output stx_pad_o;
output rts_pad_o;
input cts_pad_i;
output dtr_pad_o;
input dsr_pad_i;
input ri_pad_i;
input dcd_pad_i;
 
// optional baudrate output
`ifdef UART_HAS_BAUDRATE_OUTPUT
output baud_o;
`endif
 
 
wire stx_pad_o;
wire rts_pad_o;
wire dtr_pad_o;
 
wire [uart_addr_width-1:0] wb_adr_i;
wire [uart_data_width-1:0] wb_dat_i;
wire [uart_data_width-1:0] wb_dat_o;
 
wire [7:0] wb_dat8_i; // 8-bit internal data input
wire [7:0] wb_dat8_o; // 8-bit internal data output
wire [31:0] wb_dat32_o; // debug interface 32-bit output
wire [3:0] wb_sel_i; // WISHBONE select signal
wire [uart_addr_width-1:0] wb_adr_int;
wire we_o; // Write enable for registers
wire re_o; // Read enable for registers
//
// MODULE INSTANCES
//
 
`ifdef DATA_BUS_WIDTH_8
`else
// debug interface wires
wire [3:0] ier;
wire [3:0] iir;
wire [1:0] fcr;
wire [4:0] mcr;
wire [7:0] lcr;
wire [7:0] msr;
wire [7:0] lsr;
wire [`UART_FIFO_COUNTER_W-1:0] rf_count;
wire [`UART_FIFO_COUNTER_W-1:0] tf_count;
wire [2:0] tstate;
wire [3:0] rstate;
`endif
 
`ifdef DATA_BUS_WIDTH_8
//// WISHBONE interface module
uart_wb wb_interface(
.clk( wb_clk_i ),
.wb_rst_i( wb_rst_i ),
.wb_dat_i(wb_dat_i),
.wb_dat_o(wb_dat_o),
.wb_dat8_i(wb_dat8_i),
.wb_dat8_o(wb_dat8_o),
.wb_dat32_o(32'b0),
.wb_sel_i(4'b0),
.wb_we_i( wb_we_i ),
.wb_stb_i( wb_stb_i ),
.wb_cyc_i( wb_cyc_i ),
.wb_ack_o( wb_ack_o ),
.wb_adr_i(wb_adr_i),
.wb_adr_int(wb_adr_int),
.we_o( we_o ),
.re_o(re_o)
);
`else
uart_wb wb_interface(
.clk( wb_clk_i ),
.wb_rst_i( wb_rst_i ),
.wb_dat_i(wb_dat_i),
.wb_dat_o(wb_dat_o),
.wb_dat8_i(wb_dat8_i),
.wb_dat8_o(wb_dat8_o),
.wb_sel_i(wb_sel_i),
.wb_dat32_o(wb_dat32_o),
.wb_we_i( wb_we_i ),
.wb_stb_i( wb_stb_i ),
.wb_cyc_i( wb_cyc_i ),
.wb_ack_o( wb_ack_o ),
.wb_adr_i(wb_adr_i),
.wb_adr_int(wb_adr_int),
.we_o( we_o ),
.re_o(re_o)
);
`endif
 
// Registers
uart_regs regs(
.clk( wb_clk_i ),
.wb_rst_i( wb_rst_i ),
.wb_addr_i( wb_adr_int ),
.wb_dat_i( wb_dat8_i ),
.wb_dat_o( wb_dat8_o ),
.wb_we_i( we_o ),
.wb_re_i(re_o),
.modem_inputs( {cts_pad_i, dsr_pad_i,
ri_pad_i, dcd_pad_i} ),
.stx_pad_o( stx_pad_o ),
.srx_pad_i( srx_pad_i ),
`ifdef DATA_BUS_WIDTH_8
`else
// debug interface signals enabled
.ier(ier),
.iir(iir),
.fcr(fcr),
.mcr(mcr),
.lcr(lcr),
.msr(msr),
.lsr(lsr),
.rf_count(rf_count),
.tf_count(tf_count),
.tstate(tstate),
.rstate(rstate),
`endif
.rts_pad_o( rts_pad_o ),
.dtr_pad_o( dtr_pad_o ),
.int_o( int_o )
`ifdef UART_HAS_BAUDRATE_OUTPUT
, .baud_o(baud_o)
`endif
 
);
 
`ifdef DATA_BUS_WIDTH_8
`else
uart_debug_if dbg(/*AUTOINST*/
// Outputs
.wb_dat32_o (wb_dat32_o[31:0]),
// Inputs
.wb_adr_i (wb_adr_int[`UART_ADDR_WIDTH-1:0]),
.ier (ier[3:0]),
.iir (iir[3:0]),
.fcr (fcr[1:0]),
.mcr (mcr[4:0]),
.lcr (lcr[7:0]),
.msr (msr[7:0]),
.lsr (lsr[7:0]),
.rf_count (rf_count[`UART_FIFO_COUNTER_W-1:0]),
.tf_count (tf_count[`UART_FIFO_COUNTER_W-1:0]),
.tstate (tstate[2:0]),
.rstate (rstate[3:0]));
`endif
/*
initial
begin
`ifdef DATA_BUS_WIDTH_8
$display("(%m) UART INFO: Data bus width is 8. No Debug interface.\n");
`else
$display("(%m) UART INFO: Data bus width is 32. Debug Interface present.\n");
`endif
`ifdef UART_HAS_BAUDRATE_OUTPUT
$display("(%m) UART INFO: Has baudrate output\n");
`else
$display("(%m) UART INFO: Doesn't have baudrate output\n");
`endif
end
*/
endmodule
 
 
/verilog/raminfr.v
0,0 → 1,114
//////////////////////////////////////////////////////////////////////
//// ////
//// raminfr.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// Inferrable Distributed RAM for FIFOs ////
//// ////
//// Known problems (limits): ////
//// None . ////
//// ////
//// To Do: ////
//// Nothing so far. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// ////
//// Created: 2002/07/22 ////
//// Last Updated: 2002/07/22 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.2 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.1 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
 
//Following is the Verilog code for a dual-port RAM with asynchronous read.
module raminfr
(clk, we, a, dpra, di, dpo);
 
parameter addr_width = 4;
parameter data_width = 8;
parameter depth = 16;
 
input clk;
input we;
input [addr_width-1:0] a;
input [addr_width-1:0] dpra;
input [data_width-1:0] di;
//output [data_width-1:0] spo;
output [data_width-1:0] dpo;
reg [data_width-1:0] ram [depth-1:0];
 
wire [data_width-1:0] dpo;
wire [data_width-1:0] di;
wire [addr_width-1:0] a;
wire [addr_width-1:0] dpra;
always @(posedge clk) begin
if (we)
ram[a] <= di;
end
// assign spo = ram[a];
assign dpo = ram[dpra];
endmodule
 
/verilog/uart_debug_if.v
0,0 → 1,129
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_debug_if.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core debug interface. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// ////
//// Created: 2001/12/02 ////
//// (See log for the revision history) ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.5 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.4 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.3 2001/12/19 08:40:03 mohor
// Warnings fixed (unused signals removed).
//
// Revision 1.2 2001/12/12 22:17:30 gorban
// some synthesis bugs fixed
//
// Revision 1.1 2001/12/04 21:14:16 gorban
// committed the debug interface file
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_debug_if (/*AUTOARG*/
// Outputs
wb_dat32_o,
// Inputs
wb_adr_i, ier, iir, fcr, mcr, lcr, msr,
lsr, rf_count, tf_count, tstate, rstate
) ;
 
input [`UART_ADDR_WIDTH-1:0] wb_adr_i;
output [31:0] wb_dat32_o;
input [3:0] ier;
input [3:0] iir;
input [1:0] fcr; /// bits 7 and 6 of fcr. Other bits are ignored
input [4:0] mcr;
input [7:0] lcr;
input [7:0] msr;
input [7:0] lsr;
input [`UART_FIFO_COUNTER_W-1:0] rf_count;
input [`UART_FIFO_COUNTER_W-1:0] tf_count;
input [2:0] tstate;
input [3:0] rstate;
 
 
wire [`UART_ADDR_WIDTH-1:0] wb_adr_i;
reg [31:0] wb_dat32_o;
 
always @(/*AUTOSENSE*/fcr or ier or iir or lcr or lsr or mcr or msr
or rf_count or rstate or tf_count or tstate or wb_adr_i)
case (wb_adr_i)
// 8 + 8 + 4 + 4 + 8
5'b01000: wb_dat32_o = {msr,lcr,iir,ier,lsr};
// 5 + 2 + 5 + 4 + 5 + 3
5'b01100: wb_dat32_o = {8'b0, fcr,mcr, rf_count, rstate, tf_count, tstate};
default: wb_dat32_o = 0;
endcase // case(wb_adr_i)
 
endmodule // uart_debug_if
 
/verilog/uart_receiver.v
0,0 → 1,485
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_receiver.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core receiver logic ////
//// ////
//// Known problems (limits): ////
//// None known ////
//// ////
//// To Do: ////
//// Thourough testing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.31 2004/06/18 14:46:15 tadejm
// Brandl Tobias repaired a bug regarding frame error in receiver when brake is received.
//
// Revision 1.29 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.28 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.27 2001/12/30 20:39:13 mohor
// More than one character was stored in case of break. End of the break
// was not detected correctly.
//
// Revision 1.26 2001/12/20 13:28:27 mohor
// Missing declaration of rf_push_q fixed.
//
// Revision 1.25 2001/12/20 13:25:46 mohor
// rx push changed to be only one cycle wide.
//
// Revision 1.24 2001/12/19 08:03:34 mohor
// Warnings cleared.
//
// Revision 1.23 2001/12/19 07:33:54 mohor
// Synplicity was having troubles with the comment.
//
// Revision 1.22 2001/12/17 14:46:48 mohor
// overrun signal was moved to separate block because many sequential lsr
// reads were preventing data from being written to rx fifo.
// underrun signal was not used and was removed from the project.
//
// Revision 1.21 2001/12/13 10:31:16 mohor
// timeout irq must be set regardless of the rda irq (rda irq does not reset the
// timeout counter).
//
// Revision 1.20 2001/12/10 19:52:05 gorban
// Igor fixed break condition bugs
//
// Revision 1.19 2001/12/06 14:51:04 gorban
// Bug in LSR[0] is fixed.
// All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.
//
// Revision 1.18 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.17 2001/11/28 19:36:39 gorban
// Fixed: timeout and break didn't pay attention to current data format when counting time
//
// Revision 1.16 2001/11/27 22:17:09 gorban
// Fixed bug that prevented synthesis in uart_receiver.v
//
// Revision 1.15 2001/11/26 21:38:54 gorban
// Lots of fixes:
// Break condition wasn't handled correctly at all.
// LSR bits could lose their values.
// LSR value after reset was wrong.
// Timing of THRE interrupt signal corrected.
// LSR bit 0 timing corrected.
//
// Revision 1.14 2001/11/10 12:43:21 gorban
// Logic Synthesis bugs fixed. Some other minor changes
//
// Revision 1.13 2001/11/08 14:54:23 mohor
// Comments in Slovene language deleted, few small fixes for better work of
// old tools. IRQs need to be fix.
//
// Revision 1.12 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.11 2001/10/31 15:19:22 gorban
// Fixes to break and timeout conditions
//
// Revision 1.10 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.9 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.8 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.6 2001/06/23 11:21:48 gorban
// DL made 16-bit long. Fixed transmission/reception bugs.
//
// Revision 1.5 2001/06/02 14:28:14 gorban
// Fixed receiver and transmitter. Major bug fixed.
//
// Revision 1.4 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/27 17:37:49 gorban
// Fixed many bugs. Updated spec. Changed FIFO files structure. See CHANGES.txt file.
//
// Revision 1.2 2001/05/21 19:12:02 gorban
// Corrected some Linter messages.
//
// Revision 1.1 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:11+02 jacob
// Initial revision
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_receiver (clk, wb_rst_i, lcr, rf_pop, srx_pad_i, enable,
counter_t, rf_count, rf_data_out, rf_error_bit, rf_overrun, rx_reset, lsr_mask, rstate, rf_push_pulse);
 
input clk;
input wb_rst_i;
input [7:0] lcr;
input rf_pop;
input srx_pad_i;
input enable;
input rx_reset;
input lsr_mask;
 
output [9:0] counter_t;
output [`UART_FIFO_COUNTER_W-1:0] rf_count;
output [`UART_FIFO_REC_WIDTH-1:0] rf_data_out;
output rf_overrun;
output rf_error_bit;
output [3:0] rstate;
output rf_push_pulse;
 
reg [3:0] rstate;
reg [3:0] rcounter16;
reg [2:0] rbit_counter;
reg [7:0] rshift; // receiver shift register
reg rparity; // received parity
reg rparity_error;
reg rframing_error; // framing error flag
reg rbit_in;
reg rparity_xor;
reg [7:0] counter_b; // counts the 0 (low) signals
reg rf_push_q;
 
// RX FIFO signals
reg [`UART_FIFO_REC_WIDTH-1:0] rf_data_in;
wire [`UART_FIFO_REC_WIDTH-1:0] rf_data_out;
wire rf_push_pulse;
reg rf_push;
wire rf_pop;
wire rf_overrun;
wire [`UART_FIFO_COUNTER_W-1:0] rf_count;
wire rf_error_bit; // an error (parity or framing) is inside the fifo
wire break_error = (counter_b == 0);
 
// RX FIFO instance
uart_rfifo #(`UART_FIFO_REC_WIDTH) fifo_rx(
.clk( clk ),
.wb_rst_i( wb_rst_i ),
.data_in( rf_data_in ),
.data_out( rf_data_out ),
.push( rf_push_pulse ),
.pop( rf_pop ),
.overrun( rf_overrun ),
.count( rf_count ),
.error_bit( rf_error_bit ),
.fifo_reset( rx_reset ),
.reset_status(lsr_mask)
);
 
wire rcounter16_eq_7 = (rcounter16 == 4'd7);
wire rcounter16_eq_0 = (rcounter16 == 4'd0);
wire rcounter16_eq_1 = (rcounter16 == 4'd1);
 
wire [3:0] rcounter16_minus_1 = rcounter16 - 1'b1;
 
parameter sr_idle = 4'd0;
parameter sr_rec_start = 4'd1;
parameter sr_rec_bit = 4'd2;
parameter sr_rec_parity = 4'd3;
parameter sr_rec_stop = 4'd4;
parameter sr_check_parity = 4'd5;
parameter sr_rec_prepare = 4'd6;
parameter sr_end_bit = 4'd7;
parameter sr_ca_lc_parity = 4'd8;
parameter sr_wait1 = 4'd9;
parameter sr_push = 4'd10;
 
 
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
begin
rstate <= #1 sr_idle;
rbit_in <= #1 1'b0;
rcounter16 <= #1 0;
rbit_counter <= #1 0;
rparity_xor <= #1 1'b0;
rframing_error <= #1 1'b0;
rparity_error <= #1 1'b0;
rparity <= #1 1'b0;
rshift <= #1 0;
rf_push <= #1 1'b0;
rf_data_in <= #1 0;
end
else
if (enable)
begin
case (rstate)
sr_idle : begin
rf_push <= #1 1'b0;
rf_data_in <= #1 0;
rcounter16 <= #1 4'b1110;
if (srx_pad_i==1'b0 & ~break_error) // detected a pulse (start bit?)
begin
rstate <= #1 sr_rec_start;
end
end
sr_rec_start : begin
rf_push <= #1 1'b0;
if (rcounter16_eq_7) // check the pulse
if (srx_pad_i==1'b1) // no start bit
rstate <= #1 sr_idle;
else // start bit detected
rstate <= #1 sr_rec_prepare;
rcounter16 <= #1 rcounter16_minus_1;
end
sr_rec_prepare:begin
case (lcr[/*`UART_LC_BITS*/1:0]) // number of bits in a word
2'b00 : rbit_counter <= #1 3'b100;
2'b01 : rbit_counter <= #1 3'b101;
2'b10 : rbit_counter <= #1 3'b110;
2'b11 : rbit_counter <= #1 3'b111;
endcase
if (rcounter16_eq_0)
begin
rstate <= #1 sr_rec_bit;
rcounter16 <= #1 4'b1110;
rshift <= #1 0;
end
else
rstate <= #1 sr_rec_prepare;
rcounter16 <= #1 rcounter16_minus_1;
end
sr_rec_bit : begin
if (rcounter16_eq_0)
rstate <= #1 sr_end_bit;
if (rcounter16_eq_7) // read the bit
case (lcr[/*`UART_LC_BITS*/1:0]) // number of bits in a word
2'b00 : rshift[4:0] <= #1 {srx_pad_i, rshift[4:1]};
2'b01 : rshift[5:0] <= #1 {srx_pad_i, rshift[5:1]};
2'b10 : rshift[6:0] <= #1 {srx_pad_i, rshift[6:1]};
2'b11 : rshift[7:0] <= #1 {srx_pad_i, rshift[7:1]};
endcase
rcounter16 <= #1 rcounter16_minus_1;
end
sr_end_bit : begin
if (rbit_counter==3'b0) // no more bits in word
if (lcr[`UART_LC_PE]) // choose state based on parity
rstate <= #1 sr_rec_parity;
else
begin
rstate <= #1 sr_rec_stop;
rparity_error <= #1 1'b0; // no parity - no error :)
end
else // else we have more bits to read
begin
rstate <= #1 sr_rec_bit;
rbit_counter <= #1 rbit_counter - 1'b1;
end
rcounter16 <= #1 4'b1110;
end
sr_rec_parity: begin
if (rcounter16_eq_7) // read the parity
begin
rparity <= #1 srx_pad_i;
rstate <= #1 sr_ca_lc_parity;
end
rcounter16 <= #1 rcounter16_minus_1;
end
sr_ca_lc_parity : begin // rcounter equals 6
rcounter16 <= #1 rcounter16_minus_1;
rparity_xor <= #1 ^{rshift,rparity}; // calculate parity on all incoming data
rstate <= #1 sr_check_parity;
end
sr_check_parity: begin // rcounter equals 5
case ({lcr[`UART_LC_EP],lcr[`UART_LC_SP]})
2'b00: rparity_error <= #1 rparity_xor == 0; // no error if parity 1
2'b01: rparity_error <= #1 ~rparity; // parity should sticked to 1
2'b10: rparity_error <= #1 rparity_xor == 1; // error if parity is odd
2'b11: rparity_error <= #1 rparity; // parity should be sticked to 0
endcase
rcounter16 <= #1 rcounter16_minus_1;
rstate <= #1 sr_wait1;
end
sr_wait1 : if (rcounter16_eq_0)
begin
rstate <= #1 sr_rec_stop;
rcounter16 <= #1 4'b1110;
end
else
rcounter16 <= #1 rcounter16_minus_1;
sr_rec_stop : begin
if (rcounter16_eq_7) // read the parity
begin
rframing_error <= #1 !srx_pad_i; // no framing error if input is 1 (stop bit)
rstate <= #1 sr_push;
end
rcounter16 <= #1 rcounter16_minus_1;
end
sr_push : begin
///////////////////////////////////////
// $display($time, ": received: %b", rf_data_in);
if(srx_pad_i | break_error)
begin
if(break_error)
rf_data_in <= #1 {8'b0, 3'b100}; // break input (empty character) to receiver FIFO
else
rf_data_in <= #1 {rshift, 1'b0, rparity_error, rframing_error};
rf_push <= #1 1'b1;
rstate <= #1 sr_idle;
end
else if(~rframing_error) // There's always a framing before break_error -> wait for break or srx_pad_i
begin
rf_data_in <= #1 {rshift, 1'b0, rparity_error, rframing_error};
rf_push <= #1 1'b1;
rcounter16 <= #1 4'b1110;
rstate <= #1 sr_rec_start;
end
end
default : rstate <= #1 sr_idle;
endcase
end // if (enable)
end // always of receiver
 
always @ (posedge clk or posedge wb_rst_i)
begin
if(wb_rst_i)
rf_push_q <= 0;
else
rf_push_q <= #1 rf_push;
end
 
assign rf_push_pulse = rf_push & ~rf_push_q;
 
//
// Break condition detection.
// Works in conjuction with the receiver state machine
 
reg [9:0] toc_value; // value to be set to timeout counter
 
always @(lcr)
case (lcr[3:0])
4'b0000 : toc_value = 447; // 7 bits
4'b0100 : toc_value = 479; // 7.5 bits
4'b0001, 4'b1000 : toc_value = 511; // 8 bits
4'b1100 : toc_value = 543; // 8.5 bits
4'b0010, 4'b0101, 4'b1001 : toc_value = 575; // 9 bits
4'b0011, 4'b0110, 4'b1010, 4'b1101 : toc_value = 639; // 10 bits
4'b0111, 4'b1011, 4'b1110 : toc_value = 703; // 11 bits
4'b1111 : toc_value = 767; // 12 bits
endcase // case(lcr[3:0])
 
wire [7:0] brc_value; // value to be set to break counter
assign brc_value = toc_value[9:2]; // the same as timeout but 1 insead of 4 character times
 
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
counter_b <= #1 8'd159;
else
if (srx_pad_i)
counter_b <= #1 brc_value; // character time length - 1
else
if(enable & counter_b != 8'b0) // only work on enable times break not reached.
counter_b <= #1 counter_b - 8'd1; // decrement break counter
end // always of break condition detection
 
///
/// Timeout condition detection
reg [9:0] counter_t; // counts the timeout condition clocks
 
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
counter_t <= #1 10'd639; // 10 bits for the default 8N1
else
if(rf_push_pulse || rf_pop || rf_count == 0) // counter is reset when RX FIFO is empty, accessed or above trigger level
counter_t <= #1 toc_value;
else
if (enable && counter_t != 10'b0) // we don't want to underflow
counter_t <= #1 counter_t - 8'd1;
end
endmodule
/verilog/uart_rfifo.v
0,0 → 1,323
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_rfifo.v (Modified from uart_fifo.v) ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core receiver FIFO ////
//// ////
//// To Do: ////
//// Nothing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2002/07/22 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.4 2003/07/11 18:20:26 gorban
// added clearing the receiver fifo statuses on resets
//
// Revision 1.3 2003/06/11 16:37:47 gorban
// This fixes errors in some cases when data is being read and put to the FIFO at the same time. Patch is submitted by Scott Furman. Update is very recommended.
//
// Revision 1.2 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.1 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.16 2001/12/20 13:25:46 mohor
// rx push changed to be only one cycle wide.
//
// Revision 1.15 2001/12/18 09:01:07 mohor
// Bug that was entered in the last update fixed (rx state machine).
//
// Revision 1.14 2001/12/17 14:46:48 mohor
// overrun signal was moved to separate block because many sequential lsr
// reads were preventing data from being written to rx fifo.
// underrun signal was not used and was removed from the project.
//
// Revision 1.13 2001/11/26 21:38:54 gorban
// Lots of fixes:
// Break condition wasn't handled correctly at all.
// LSR bits could lose their values.
// LSR value after reset was wrong.
// Timing of THRE interrupt signal corrected.
// LSR bit 0 timing corrected.
//
// Revision 1.12 2001/11/08 14:54:23 mohor
// Comments in Slovene language deleted, few small fixes for better work of
// old tools. IRQs need to be fix.
//
// Revision 1.11 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.10 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.9 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.8 2001/08/24 08:48:10 mohor
// FIFO was not cleared after the data was read bug fixed.
//
// Revision 1.7 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.3 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/27 17:37:48 gorban
// Fixed many bugs. Updated spec. Changed FIFO files structure. See CHANGES.txt file.
//
// Revision 1.2 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:12+02 jacob
// Initial revision
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_rfifo (clk,
wb_rst_i, data_in, data_out,
// Control signals
push, // push strobe, active high
pop, // pop strobe, active high
// status signals
overrun,
count,
error_bit,
fifo_reset,
reset_status
);
 
 
// FIFO parameters
parameter fifo_width = `UART_FIFO_WIDTH;
parameter fifo_depth = `UART_FIFO_DEPTH;
parameter fifo_pointer_w = `UART_FIFO_POINTER_W;
parameter fifo_counter_w = `UART_FIFO_COUNTER_W;
 
input clk;
input wb_rst_i;
input push;
input pop;
input [fifo_width-1:0] data_in;
input fifo_reset;
input reset_status;
 
output [fifo_width-1:0] data_out;
output overrun;
output [fifo_counter_w-1:0] count;
output error_bit;
 
wire [fifo_width-1:0] data_out;
wire [7:0] data8_out;
// flags FIFO
reg [2:0] fifo[fifo_depth-1:0];
 
// FIFO pointers
reg [fifo_pointer_w-1:0] top;
reg [fifo_pointer_w-1:0] bottom;
 
reg [fifo_counter_w-1:0] count;
reg overrun;
 
wire [fifo_pointer_w-1:0] top_plus_1 = top + 1'b1;
 
raminfr #(fifo_pointer_w,8,fifo_depth) rfifo
(.clk(clk),
.we(push),
.a(top),
.dpra(bottom),
.di(data_in[fifo_width-1:fifo_width-8]),
.dpo(data8_out)
);
 
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
begin
if (wb_rst_i)
begin
top <= #1 0;
bottom <= #1 1'b0;
count <= #1 0;
fifo[0] <= #1 0;
fifo[1] <= #1 0;
fifo[2] <= #1 0;
fifo[3] <= #1 0;
fifo[4] <= #1 0;
fifo[5] <= #1 0;
fifo[6] <= #1 0;
fifo[7] <= #1 0;
fifo[8] <= #1 0;
fifo[9] <= #1 0;
fifo[10] <= #1 0;
fifo[11] <= #1 0;
fifo[12] <= #1 0;
fifo[13] <= #1 0;
fifo[14] <= #1 0;
fifo[15] <= #1 0;
end
else
if (fifo_reset) begin
top <= #1 0;
bottom <= #1 1'b0;
count <= #1 0;
fifo[0] <= #1 0;
fifo[1] <= #1 0;
fifo[2] <= #1 0;
fifo[3] <= #1 0;
fifo[4] <= #1 0;
fifo[5] <= #1 0;
fifo[6] <= #1 0;
fifo[7] <= #1 0;
fifo[8] <= #1 0;
fifo[9] <= #1 0;
fifo[10] <= #1 0;
fifo[11] <= #1 0;
fifo[12] <= #1 0;
fifo[13] <= #1 0;
fifo[14] <= #1 0;
fifo[15] <= #1 0;
end
else
begin
case ({push, pop})
2'b10 : if (count<fifo_depth) // overrun condition
begin
top <= #1 top_plus_1;
fifo[top] <= #1 data_in[2:0];
count <= #1 count + 1'b1;
end
2'b01 : if(count>0)
begin
fifo[bottom] <= #1 0;
bottom <= #1 bottom + 1'b1;
count <= #1 count - 1'b1;
end
2'b11 : begin
bottom <= #1 bottom + 1'b1;
top <= #1 top_plus_1;
fifo[top] <= #1 data_in[2:0];
end
default: ;
endcase
end
end // always
 
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
begin
if (wb_rst_i)
overrun <= #1 1'b0;
else
if(fifo_reset | reset_status)
overrun <= #1 1'b0;
else
if(push & ~pop & (count==fifo_depth))
overrun <= #1 1'b1;
end // always
 
 
// please note though that data_out is only valid one clock after pop signal
assign data_out = {data8_out,fifo[bottom]};
 
// Additional logic for detection of error conditions (parity and framing) inside the FIFO
// for the Line Status Register bit 7
 
wire [2:0] word0 = fifo[0];
wire [2:0] word1 = fifo[1];
wire [2:0] word2 = fifo[2];
wire [2:0] word3 = fifo[3];
wire [2:0] word4 = fifo[4];
wire [2:0] word5 = fifo[5];
wire [2:0] word6 = fifo[6];
wire [2:0] word7 = fifo[7];
 
wire [2:0] word8 = fifo[8];
wire [2:0] word9 = fifo[9];
wire [2:0] word10 = fifo[10];
wire [2:0] word11 = fifo[11];
wire [2:0] word12 = fifo[12];
wire [2:0] word13 = fifo[13];
wire [2:0] word14 = fifo[14];
wire [2:0] word15 = fifo[15];
 
// a 1 is returned if any of the error bits in the fifo is 1
assign error_bit = |(word0[2:0] | word1[2:0] | word2[2:0] | word3[2:0] |
word4[2:0] | word5[2:0] | word6[2:0] | word7[2:0] |
word8[2:0] | word9[2:0] | word10[2:0] | word11[2:0] |
word12[2:0] | word13[2:0] | word14[2:0] | word15[2:0] );
 
endmodule
/verilog/uart_tfifo.v
0,0 → 1,246
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_tfifo.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core transmitter FIFO ////
//// ////
//// To Do: ////
//// Nothing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2002/07/22 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.2 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.1 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.16 2001/12/20 13:25:46 mohor
// rx push changed to be only one cycle wide.
//
// Revision 1.15 2001/12/18 09:01:07 mohor
// Bug that was entered in the last update fixed (rx state machine).
//
// Revision 1.14 2001/12/17 14:46:48 mohor
// overrun signal was moved to separate block because many sequential lsr
// reads were preventing data from being written to rx fifo.
// underrun signal was not used and was removed from the project.
//
// Revision 1.13 2001/11/26 21:38:54 gorban
// Lots of fixes:
// Break condition wasn't handled correctly at all.
// LSR bits could lose their values.
// LSR value after reset was wrong.
// Timing of THRE interrupt signal corrected.
// LSR bit 0 timing corrected.
//
// Revision 1.12 2001/11/08 14:54:23 mohor
// Comments in Slovene language deleted, few small fixes for better work of
// old tools. IRQs need to be fix.
//
// Revision 1.11 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.10 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.9 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.8 2001/08/24 08:48:10 mohor
// FIFO was not cleared after the data was read bug fixed.
//
// Revision 1.7 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.3 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/27 17:37:48 gorban
// Fixed many bugs. Updated spec. Changed FIFO files structure. See CHANGES.txt file.
//
// Revision 1.2 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:12+02 jacob
// Initial revision
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_tfifo (clk,
wb_rst_i, data_in, data_out,
// Control signals
push, // push strobe, active high
pop, // pop strobe, active high
// status signals
overrun,
count,
fifo_reset,
reset_status
);
 
 
// FIFO parameters
parameter fifo_width = `UART_FIFO_WIDTH;
parameter fifo_depth = `UART_FIFO_DEPTH;
parameter fifo_pointer_w = `UART_FIFO_POINTER_W;
parameter fifo_counter_w = `UART_FIFO_COUNTER_W;
 
input clk;
input wb_rst_i;
input push;
input pop;
input [fifo_width-1:0] data_in;
input fifo_reset;
input reset_status;
 
output [fifo_width-1:0] data_out;
output overrun;
output [fifo_counter_w-1:0] count;
 
wire [fifo_width-1:0] data_out;
 
// FIFO pointers
reg [fifo_pointer_w-1:0] top;
reg [fifo_pointer_w-1:0] bottom;
 
reg [fifo_counter_w-1:0] count;
reg overrun;
wire [fifo_pointer_w-1:0] top_plus_1 = top + 1'b1;
 
raminfr #(fifo_pointer_w,fifo_width,fifo_depth) tfifo
(.clk(clk),
.we(push),
.a(top),
.dpra(bottom),
.di(data_in),
.dpo(data_out)
);
 
 
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
begin
if (wb_rst_i)
begin
top <= #1 0;
bottom <= #1 1'b0;
count <= #1 0;
end
else
if (fifo_reset) begin
top <= #1 0;
bottom <= #1 1'b0;
count <= #1 0;
end
else
begin
case ({push, pop})
2'b10 : if (count<fifo_depth) // overrun condition
begin
top <= #1 top_plus_1;
count <= #1 count + 1'b1;
end
2'b01 : if(count>0)
begin
bottom <= #1 bottom + 1'b1;
count <= #1 count - 1'b1;
end
2'b11 : begin
bottom <= #1 bottom + 1'b1;
top <= #1 top_plus_1;
end
default: ;
endcase
end
end // always
 
always @(posedge clk or posedge wb_rst_i) // synchronous FIFO
begin
if (wb_rst_i)
overrun <= #1 1'b0;
else
if(fifo_reset | reset_status)
overrun <= #1 1'b0;
else
if(push & (count==fifo_depth))
overrun <= #1 1'b1;
end // always
 
endmodule
/verilog/uart_wb.v
0,0 → 1,320
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_wb.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core WISHBONE interface. ////
//// ////
//// Known problems (limits): ////
//// Inserts one wait state on all transfers. ////
//// Note affected signals and the way they are affected. ////
//// ////
//// To Do: ////
//// Nothing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.17 2004/05/21 12:35:15 tadejm
// Added 2 LSB address generation dependent on select lines and LITLE/BIG endian when UART is in 32-bit mode.
//
// Revision 1.16 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.15 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.12 2001/12/19 08:03:34 mohor
// Warnings cleared.
//
// Revision 1.11 2001/12/06 14:51:04 gorban
// Bug in LSR[0] is fixed.
// All WISHBONE signals are now sampled, so another wait-state is introduced on all transfers.
//
// Revision 1.10 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.9 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.8 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.7 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.4 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/21 19:12:01 gorban
// Corrected some Linter messages.
//
// Revision 1.2 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:13+02 jacob
// Initial revision
//
//
 
// UART core WISHBONE interface
//
// Author: Jacob Gorban (jacob.gorban@flextronicssemi.com)
// Company: Flextronics Semiconductor
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
`include "uart_defines.v"
module uart_wb (clk, wb_rst_i,
wb_we_i, wb_stb_i, wb_cyc_i, wb_ack_o, wb_adr_i,
wb_adr_int, wb_dat_i, wb_dat_o, wb_dat8_i, wb_dat8_o, wb_dat32_o, wb_sel_i,
we_o, re_o // Write and read enable output for the core
);
 
input clk;
 
// WISHBONE interface
input wb_rst_i;
input wb_we_i;
input wb_stb_i;
input wb_cyc_i;
input [3:0] wb_sel_i;
input [`UART_ADDR_WIDTH-1:0] wb_adr_i; //WISHBONE address line
 
`ifdef DATA_BUS_WIDTH_8
input [7:0] wb_dat_i; //input WISHBONE bus
output [7:0] wb_dat_o;
reg [7:0] wb_dat_o;
wire [7:0] wb_dat_i;
reg [7:0] wb_dat_is;
`else // for 32 data bus mode
input [31:0] wb_dat_i; //input WISHBONE bus
output [31:0] wb_dat_o;
reg [31:0] wb_dat_o;
wire [31:0] wb_dat_i;
reg [31:0] wb_dat_is;
`endif // !`ifdef DATA_BUS_WIDTH_8
 
output [`UART_ADDR_WIDTH-1:0] wb_adr_int; // internal signal for address bus
input [7:0] wb_dat8_o; // internal 8 bit output to be put into wb_dat_o
output [7:0] wb_dat8_i;
input [31:0] wb_dat32_o; // 32 bit data output (for debug interface)
output wb_ack_o;
output we_o;
output re_o;
 
wire we_o;
reg wb_ack_o;
reg [7:0] wb_dat8_i;
wire [7:0] wb_dat8_o;
wire [`UART_ADDR_WIDTH-1:0] wb_adr_int; // internal signal for address bus
reg [`UART_ADDR_WIDTH-1:0] wb_adr_is;
reg wb_we_is;
reg wb_cyc_is;
reg wb_stb_is;
reg [3:0] wb_sel_is;
wire [3:0] wb_sel_i;
reg wre ;// timing control signal for write or read enable
 
// wb_ack_o FSM
reg [1:0] wbstate;
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) begin
wb_ack_o <= #1 1'b0;
wbstate <= #1 0;
wre <= #1 1'b1;
end else
case (wbstate)
0: begin
if (wb_stb_is & wb_cyc_is) begin
wre <= #1 0;
wbstate <= #1 1;
wb_ack_o <= #1 1;
end else begin
wre <= #1 1;
wb_ack_o <= #1 0;
end
end
1: begin
wb_ack_o <= #1 0;
wbstate <= #1 2;
wre <= #1 0;
end
2,3: begin
wb_ack_o <= #1 0;
wbstate <= #1 0;
wre <= #1 0;
end
endcase
 
assign we_o = wb_we_is & wb_stb_is & wb_cyc_is & wre ; //WE for registers
assign re_o = ~wb_we_is & wb_stb_is & wb_cyc_is & wre ; //RE for registers
 
// Sample input signals
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i) begin
wb_adr_is <= #1 0;
wb_we_is <= #1 0;
wb_cyc_is <= #1 0;
wb_stb_is <= #1 0;
wb_dat_is <= #1 0;
wb_sel_is <= #1 0;
end else begin
wb_adr_is <= #1 wb_adr_i;
wb_we_is <= #1 wb_we_i;
wb_cyc_is <= #1 wb_cyc_i;
wb_stb_is <= #1 wb_stb_i;
wb_dat_is <= #1 wb_dat_i;
wb_sel_is <= #1 wb_sel_i;
end
 
`ifdef DATA_BUS_WIDTH_8 // 8-bit data bus
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
wb_dat_o <= #1 0;
else
wb_dat_o <= #1 wb_dat8_o;
 
always @(wb_dat_is)
wb_dat8_i = wb_dat_is;
 
assign wb_adr_int = wb_adr_is;
 
`else // 32-bit bus
// put output to the correct byte in 32 bits using select line
always @(posedge clk or posedge wb_rst_i)
if (wb_rst_i)
wb_dat_o <= #1 0;
else if (re_o)
case (wb_sel_is)
4'b0001: wb_dat_o <= #1 {24'b0, wb_dat8_o};
4'b0010: wb_dat_o <= #1 {16'b0, wb_dat8_o, 8'b0};
4'b0100: wb_dat_o <= #1 {8'b0, wb_dat8_o, 16'b0};
4'b1000: wb_dat_o <= #1 {wb_dat8_o, 24'b0};
4'b1111: wb_dat_o <= #1 wb_dat32_o; // debug interface output
default: wb_dat_o <= #1 0;
endcase // case(wb_sel_i)
 
reg [1:0] wb_adr_int_lsb;
 
always @(wb_sel_is or wb_dat_is)
begin
case (wb_sel_is)
4'b0001 : wb_dat8_i = wb_dat_is[7:0];
4'b0010 : wb_dat8_i = wb_dat_is[15:8];
4'b0100 : wb_dat8_i = wb_dat_is[23:16];
4'b1000 : wb_dat8_i = wb_dat_is[31:24];
default : wb_dat8_i = wb_dat_is[7:0];
endcase // case(wb_sel_i)
 
`ifdef LITLE_ENDIAN
case (wb_sel_is)
4'b0001 : wb_adr_int_lsb = 2'h0;
4'b0010 : wb_adr_int_lsb = 2'h1;
4'b0100 : wb_adr_int_lsb = 2'h2;
4'b1000 : wb_adr_int_lsb = 2'h3;
default : wb_adr_int_lsb = 2'h0;
endcase // case(wb_sel_i)
`else
case (wb_sel_is)
4'b0001 : wb_adr_int_lsb = 2'h3;
4'b0010 : wb_adr_int_lsb = 2'h2;
4'b0100 : wb_adr_int_lsb = 2'h1;
4'b1000 : wb_adr_int_lsb = 2'h0;
default : wb_adr_int_lsb = 2'h0;
endcase // case(wb_sel_i)
`endif
end
 
assign wb_adr_int = {wb_adr_is[`UART_ADDR_WIDTH-1:2], wb_adr_int_lsb};
 
`endif // !`ifdef DATA_BUS_WIDTH_8
 
endmodule
 
 
 
 
 
 
 
 
 
 
/verilog/timescale.v
0,0 → 1,64
//////////////////////////////////////////////////////////////////////
//// ////
//// timescale.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// Defines of the Core ////
//// ////
//// Known problems (limits): ////
//// None ////
//// ////
//// To Do: ////
//// Nothing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
// Timescale define
 
`timescale 1ns/10ps
/verilog/uart_transmitter.v
0,0 → 1,354
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_transmitter.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core transmitter logic ////
//// ////
//// Known problems (limits): ////
//// None known ////
//// ////
//// To Do: ////
//// Thourough testing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.19 2002/07/29 21:16:18 gorban
// The uart_defines.v file is included again in sources.
//
// Revision 1.18 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.16 2002/01/08 11:29:40 mohor
// tf_pop was too wide. Now it is only 1 clk cycle width.
//
// Revision 1.15 2001/12/17 14:46:48 mohor
// overrun signal was moved to separate block because many sequential lsr
// reads were preventing data from being written to rx fifo.
// underrun signal was not used and was removed from the project.
//
// Revision 1.14 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.13 2001/11/08 14:54:23 mohor
// Comments in Slovene language deleted, few small fixes for better work of
// old tools. IRQs need to be fix.
//
// Revision 1.12 2001/11/07 17:51:52 gorban
// Heavily rewritten interrupt and LSR subsystems.
// Many bugs hopefully squashed.
//
// Revision 1.11 2001/10/29 17:00:46 gorban
// fixed parity sending and tx_fifo resets over- and underrun
//
// Revision 1.10 2001/10/20 09:58:40 gorban
// Small synopsis fixes
//
// Revision 1.9 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.8 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.6 2001/06/23 11:21:48 gorban
// DL made 16-bit long. Fixed transmission/reception bugs.
//
// Revision 1.5 2001/06/02 14:28:14 gorban
// Fixed receiver and transmitter. Major bug fixed.
//
// Revision 1.4 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.3 2001/05/27 17:37:49 gorban
// Fixed many bugs. Updated spec. Changed FIFO files structure. See CHANGES.txt file.
//
// Revision 1.2 2001/05/21 19:12:02 gorban
// Corrected some Linter messages.
//
// Revision 1.1 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:12+02 jacob
// Initial revision
//
//
 
// synopsys translate_off
`include "timescale.v"
// synopsys translate_on
 
`include "uart_defines.v"
 
module uart_transmitter (clk, wb_rst_i, lcr, tf_push, wb_dat_i, enable, stx_pad_o, tstate, tf_count, tx_reset, lsr_mask);
 
input clk;
input wb_rst_i;
input [7:0] lcr;
input tf_push;
input [7:0] wb_dat_i;
input enable;
input tx_reset;
input lsr_mask; //reset of fifo
output stx_pad_o;
output [2:0] tstate;
output [`UART_FIFO_COUNTER_W-1:0] tf_count;
 
reg [2:0] tstate;
reg [4:0] counter;
reg [2:0] bit_counter; // counts the bits to be sent
reg [6:0] shift_out; // output shift register
reg stx_o_tmp;
reg parity_xor; // parity of the word
reg tf_pop;
reg bit_out;
 
// TX FIFO instance
//
// Transmitter FIFO signals
wire [`UART_FIFO_WIDTH-1:0] tf_data_in;
wire [`UART_FIFO_WIDTH-1:0] tf_data_out;
wire tf_push;
wire tf_overrun;
wire [`UART_FIFO_COUNTER_W-1:0] tf_count;
 
assign tf_data_in = wb_dat_i;
 
uart_tfifo fifo_tx( // error bit signal is not used in transmitter FIFO
.clk( clk ),
.wb_rst_i( wb_rst_i ),
.data_in( tf_data_in ),
.data_out( tf_data_out ),
.push( tf_push ),
.pop( tf_pop ),
.overrun( tf_overrun ),
.count( tf_count ),
.fifo_reset( tx_reset ),
.reset_status(lsr_mask)
);
 
// TRANSMITTER FINAL STATE MACHINE
 
parameter s_idle = 3'd0;
parameter s_send_start = 3'd1;
parameter s_send_byte = 3'd2;
parameter s_send_parity = 3'd3;
parameter s_send_stop = 3'd4;
parameter s_pop_byte = 3'd5;
 
always @(posedge clk or posedge wb_rst_i)
begin
if (wb_rst_i)
begin
tstate <= #1 s_idle;
stx_o_tmp <= #1 1'b1;
counter <= #1 5'b0;
shift_out <= #1 7'b0;
bit_out <= #1 1'b0;
parity_xor <= #1 1'b0;
tf_pop <= #1 1'b0;
bit_counter <= #1 3'b0;
end
else
if (enable)
begin
case (tstate)
s_idle : if (~|tf_count) // if tf_count==0
begin
tstate <= #1 s_idle;
stx_o_tmp <= #1 1'b1;
end
else
begin
tf_pop <= #1 1'b0;
stx_o_tmp <= #1 1'b1;
tstate <= #1 s_pop_byte;
end
s_pop_byte : begin
tf_pop <= #1 1'b1;
case (lcr[/*`UART_LC_BITS*/1:0]) // number of bits in a word
2'b00 : begin
bit_counter <= #1 3'b100;
parity_xor <= #1 ^tf_data_out[4:0];
end
2'b01 : begin
bit_counter <= #1 3'b101;
parity_xor <= #1 ^tf_data_out[5:0];
end
2'b10 : begin
bit_counter <= #1 3'b110;
parity_xor <= #1 ^tf_data_out[6:0];
end
2'b11 : begin
bit_counter <= #1 3'b111;
parity_xor <= #1 ^tf_data_out[7:0];
end
endcase
{shift_out[6:0], bit_out} <= #1 tf_data_out;
tstate <= #1 s_send_start;
end
s_send_start : begin
tf_pop <= #1 1'b0;
if (~|counter)
counter <= #1 5'b01111;
else
if (counter == 5'b00001)
begin
counter <= #1 0;
tstate <= #1 s_send_byte;
end
else
counter <= #1 counter - 1'b1;
stx_o_tmp <= #1 1'b0;
end
s_send_byte : begin
if (~|counter)
counter <= #1 5'b01111;
else
if (counter == 5'b00001)
begin
if (bit_counter > 3'b0)
begin
bit_counter <= #1 bit_counter - 1'b1;
{shift_out[5:0],bit_out } <= #1 {shift_out[6:1], shift_out[0]};
tstate <= #1 s_send_byte;
end
else // end of byte
if (~lcr[`UART_LC_PE])
begin
tstate <= #1 s_send_stop;
end
else
begin
case ({lcr[`UART_LC_EP],lcr[`UART_LC_SP]})
2'b00: bit_out <= #1 ~parity_xor;
2'b01: bit_out <= #1 1'b1;
2'b10: bit_out <= #1 parity_xor;
2'b11: bit_out <= #1 1'b0;
endcase
tstate <= #1 s_send_parity;
end
counter <= #1 0;
end
else
counter <= #1 counter - 1'b1;
stx_o_tmp <= #1 bit_out; // set output pin
end
s_send_parity : begin
if (~|counter)
counter <= #1 5'b01111;
else
if (counter == 5'b00001)
begin
counter <= #1 4'b0;
tstate <= #1 s_send_stop;
end
else
counter <= #1 counter - 1'b1;
stx_o_tmp <= #1 bit_out;
end
s_send_stop : begin
if (~|counter)
begin
casex ({lcr[`UART_LC_SB],lcr[`UART_LC_BITS]})
3'b0xx: counter <= #1 5'b01101; // 1 stop bit ok igor
3'b100: counter <= #1 5'b10101; // 1.5 stop bit
default: counter <= #1 5'b11101; // 2 stop bits
endcase
end
else
if (counter == 5'b00001)
begin
counter <= #1 0;
tstate <= #1 s_idle;
end
else
counter <= #1 counter - 1'b1;
stx_o_tmp <= #1 1'b1;
end
 
default : // should never get here
tstate <= #1 s_idle;
endcase
end // end if enable
else
tf_pop <= #1 1'b0; // tf_pop must be 1 cycle width
end // transmitter logic
 
assign stx_pad_o = lcr[`UART_LC_BC] ? 1'b0 : stx_o_tmp; // Break condition
endmodule
/verilog/uart_defines.v
0,0 → 1,250
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_defines.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// Defines of the Core ////
//// ////
//// Known problems (limits): ////
//// None ////
//// ////
//// To Do: ////
//// Nothing. ////
//// ////
//// Author(s): ////
//// - gorban@opencores.org ////
//// - Jacob Gorban ////
//// - Igor Mohor (igorm@opencores.org) ////
//// ////
//// Created: 2001/05/12 ////
//// Last Updated: 2001/05/17 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.14 2003/09/12 07:26:58 dries
// adjusted comment + define
//
// Revision 1.13 2003/06/11 16:37:47 gorban
// This fixes errors in some cases when data is being read and put to the FIFO at the same time. Patch is submitted by Scott Furman. Update is very recommended.
//
// Revision 1.12 2002/07/22 23:02:23 gorban
// Bug Fixes:
// * Possible loss of sync and bad reception of stop bit on slow baud rates fixed.
// Problem reported by Kenny.Tung.
// * Bad (or lack of ) loopback handling fixed. Reported by Cherry Withers.
//
// Improvements:
// * Made FIFO's as general inferrable memory where possible.
// So on FPGA they should be inferred as RAM (Distributed RAM on Xilinx).
// This saves about 1/3 of the Slice count and reduces P&R and synthesis times.
//
// * Added optional baudrate output (baud_o).
// This is identical to BAUDOUT* signal on 16550 chip.
// It outputs 16xbit_clock_rate - the divided clock.
// It's disabled by default. Define UART_HAS_BAUDRATE_OUTPUT to use.
//
// Revision 1.10 2001/12/11 08:55:40 mohor
// Scratch register define added.
//
// Revision 1.9 2001/12/03 21:44:29 gorban
// Updated specification documentation.
// Added full 32-bit data bus interface, now as default.
// Address is 5-bit wide in 32-bit data bus mode.
// Added wb_sel_i input to the core. It's used in the 32-bit mode.
// Added debug interface with two 32-bit read-only registers in 32-bit mode.
// Bits 5 and 6 of LSR are now only cleared on TX FIFO write.
// My small test bench is modified to work with 32-bit mode.
//
// Revision 1.8 2001/11/26 21:38:54 gorban
// Lots of fixes:
// Break condition wasn't handled correctly at all.
// LSR bits could lose their values.
// LSR value after reset was wrong.
// Timing of THRE interrupt signal corrected.
// LSR bit 0 timing corrected.
//
// Revision 1.7 2001/08/24 21:01:12 mohor
// Things connected to parity changed.
// Clock devider changed.
//
// Revision 1.6 2001/08/23 16:05:05 mohor
// Stop bit bug fixed.
// Parity bug fixed.
// WISHBONE read cycle bug fixed,
// OE indicator (Overrun Error) bug fixed.
// PE indicator (Parity Error) bug fixed.
// Register read bug fixed.
//
// Revision 1.5 2001/05/31 20:08:01 gorban
// FIFO changes and other corrections.
//
// Revision 1.4 2001/05/21 19:12:02 gorban
// Corrected some Linter messages.
//
// Revision 1.3 2001/05/17 18:34:18 gorban
// First 'stable' release. Should be sythesizable now. Also added new header.
//
// Revision 1.0 2001-05-17 21:27:11+02 jacob
// Initial revision
//
//
 
// remove comments to restore to use the new version with 8 data bit interface
// in 32bit-bus mode, the wb_sel_i signal is used to put data in correct place
// also, in 8-bit version there'll be no debugging features included
// CAUTION: doesn't work with current version of OR1200
//`define DATA_BUS_WIDTH_8
 
`ifdef DATA_BUS_WIDTH_8
`define UART_ADDR_WIDTH 3
`define UART_DATA_WIDTH 8
`else
`define UART_ADDR_WIDTH 5
`define UART_DATA_WIDTH 32
`endif
 
// Uncomment this if you want your UART to have
// 16xBaudrate output port.
// If defined, the enable signal will be used to drive baudrate_o signal
// It's frequency is 16xbaudrate
 
// `define UART_HAS_BAUDRATE_OUTPUT
 
// Register addresses
`define UART_REG_RB `UART_ADDR_WIDTH'd0 // receiver buffer
`define UART_REG_TR `UART_ADDR_WIDTH'd0 // transmitter
`define UART_REG_IE `UART_ADDR_WIDTH'd1 // Interrupt enable
`define UART_REG_II `UART_ADDR_WIDTH'd2 // Interrupt identification
`define UART_REG_FC `UART_ADDR_WIDTH'd2 // FIFO control
`define UART_REG_LC `UART_ADDR_WIDTH'd3 // Line Control
`define UART_REG_MC `UART_ADDR_WIDTH'd4 // Modem control
`define UART_REG_LS `UART_ADDR_WIDTH'd5 // Line status
`define UART_REG_MS `UART_ADDR_WIDTH'd6 // Modem status
`define UART_REG_SR `UART_ADDR_WIDTH'd7 // Scratch register
`define UART_REG_DL1 `UART_ADDR_WIDTH'd0 // Divisor latch bytes (1-2)
`define UART_REG_DL2 `UART_ADDR_WIDTH'd1
 
// Interrupt Enable register bits
`define UART_IE_RDA 0 // Received Data available interrupt
`define UART_IE_THRE 1 // Transmitter Holding Register empty interrupt
`define UART_IE_RLS 2 // Receiver Line Status Interrupt
`define UART_IE_MS 3 // Modem Status Interrupt
 
// Interrupt Identification register bits
`define UART_II_IP 0 // Interrupt pending when 0
`define UART_II_II 3:1 // Interrupt identification
 
// Interrupt identification values for bits 3:1
`define UART_II_RLS 3'b011 // Receiver Line Status
`define UART_II_RDA 3'b010 // Receiver Data available
`define UART_II_TI 3'b110 // Timeout Indication
`define UART_II_THRE 3'b001 // Transmitter Holding Register empty
`define UART_II_MS 3'b000 // Modem Status
 
// FIFO Control Register bits
`define UART_FC_TL 1:0 // Trigger level
 
// FIFO trigger level values
`define UART_FC_1 2'b00
`define UART_FC_4 2'b01
`define UART_FC_8 2'b10
`define UART_FC_14 2'b11
 
// Line Control register bits
`define UART_LC_BITS 1:0 // bits in character
`define UART_LC_SB 2 // stop bits
`define UART_LC_PE 3 // parity enable
`define UART_LC_EP 4 // even parity
`define UART_LC_SP 5 // stick parity
`define UART_LC_BC 6 // Break control
`define UART_LC_DL 7 // Divisor Latch access bit
 
// Modem Control register bits
`define UART_MC_DTR 0
`define UART_MC_RTS 1
`define UART_MC_OUT1 2
`define UART_MC_OUT2 3
`define UART_MC_LB 4 // Loopback mode
 
// Line Status Register bits
`define UART_LS_DR 0 // Data ready
`define UART_LS_OE 1 // Overrun Error
`define UART_LS_PE 2 // Parity Error
`define UART_LS_FE 3 // Framing Error
`define UART_LS_BI 4 // Break interrupt
`define UART_LS_TFE 5 // Transmit FIFO is empty
`define UART_LS_TE 6 // Transmitter Empty indicator
`define UART_LS_EI 7 // Error indicator
 
// Modem Status Register bits
`define UART_MS_DCTS 0 // Delta signals
`define UART_MS_DDSR 1
`define UART_MS_TERI 2
`define UART_MS_DDCD 3
`define UART_MS_CCTS 4 // Complement signals
`define UART_MS_CDSR 5
`define UART_MS_CRI 6
`define UART_MS_CDCD 7
 
// FIFO parameter defines
 
`define UART_FIFO_WIDTH 8
`define UART_FIFO_DEPTH 16
`define UART_FIFO_POINTER_W 4
`define UART_FIFO_COUNTER_W 5
// receiver fifo has width 11 because it has break, parity and framing error bits
`define UART_FIFO_REC_WIDTH 11
 
 
`define VERBOSE_WB 0 // All activity on the WISHBONE is recorded
`define VERBOSE_LINE_STATUS 0 // Details about the lsr (line status register)
`define FAST_TEST 1 // 64/1024 packets are sent
 
`define LITLE_ENDIAN 1
 
 
 
 
 
/verilog/uart_sync_flops.v
0,0 → 1,125
//////////////////////////////////////////////////////////////////////
//// ////
//// uart_sync_flops.v ////
//// ////
//// ////
//// This file is part of the "UART 16550 compatible" project ////
//// http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Documentation related to this project: ////
//// - http://www.opencores.org/cores/uart16550/ ////
//// ////
//// Projects compatibility: ////
//// - WISHBONE ////
//// RS232 Protocol ////
//// 16550D uart (mostly supported) ////
//// ////
//// Overview (main Features): ////
//// UART core receiver logic ////
//// ////
//// Known problems (limits): ////
//// None known ////
//// ////
//// To Do: ////
//// Thourough testing. ////
//// ////
//// Author(s): ////
//// - Andrej Erzen (andreje@flextronics.si) ////
//// - Tadej Markovic (tadejm@flextronics.si) ////
//// ////
//// Created: 2004/05/20 ////
//// Last Updated: 2004/05/20 ////
//// (See log for the revision history) ////
//// ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2000, 2001 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 ////
//// ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: not supported by cvs2svn $
// Revision 1.1 2004/05/21 11:43:25 tadejm
// Added to synchronize RX input to Wishbone clock.
//
//
 
 
`include "timescale.v"
 
 
module uart_sync_flops
(
// internal signals
rst_i,
clk_i,
stage1_rst_i,
stage1_clk_en_i,
async_dat_i,
sync_dat_o
);
 
parameter Tp = 1;
parameter width = 1;
parameter init_value = 1'b0;
 
input rst_i; // reset input
input clk_i; // clock input
input stage1_rst_i; // synchronous reset for stage 1 FF
input stage1_clk_en_i; // synchronous clock enable for stage 1 FF
input [width-1:0] async_dat_i; // asynchronous data input
output [width-1:0] sync_dat_o; // synchronous data output
 
 
//
// Interal signal declarations
//
 
reg [width-1:0] sync_dat_o;
reg [width-1:0] flop_0;
 
 
// first stage
always @ (posedge clk_i or posedge rst_i)
begin
if (rst_i)
flop_0 <= #Tp {width{init_value}};
else
flop_0 <= #Tp async_dat_i;
end
 
// second stage
always @ (posedge clk_i or posedge rst_i)
begin
if (rst_i)
sync_dat_o <= #Tp {width{init_value}};
else if (stage1_rst_i)
sync_dat_o <= #Tp {width{init_value}};
else if (stage1_clk_en_i)
sync_dat_o <= #Tp flop_0;
end
 
endmodule
/altera/uart16550.qpf
0,0 → 1,23
# Copyright (C) 1991-2007 Altera Corporation
# Your use of Altera Corporation's design tools, logic functions
# and other software and tools, and its AMPP partner logic
# functions, and any output files from any of the foregoing
# (including device programming or simulation files), and any
# associated documentation or information are expressly subject
# to the terms and conditions of the Altera Program License
# Subscription Agreement, Altera MegaCore Function License
# Agreement, or other applicable license agreement, including,
# without limitation, that your use is for the sole purpose of
# programming logic devices manufactured by Altera and sold by
# Altera or its authorized distributors. Please refer to the
# applicable agreement for further details.
 
 
 
QUARTUS_VERSION = "7.1"
DATE = "00:20:04 August 27, 2007"
 
 
# Revisions
 
PROJECT_REVISION = "uart_top"
/altera/simulation/modelsim/gate.do
0,0 → 1,8
vsim -L /home/zeus/zet/uart16550/rtl/altera/simulation/modelsim/verilog_libs/stratixii_ver -do uart_top_run_msim_gate_verilog.do -l msim_transcript -i -t ps work.uart_test
add wave sim:/uart_test/clk_
add wave sim:/uart_test/stxo_
add wave sim:/uart_test/led_
add wave sim:/uart_test/\\pll0|altpll_component|_clk0\\
add wave sim:/uart_test/\\pll0|altpll_component|_locked\\
force -freeze sim:/uart_test/clk_ 1 0, 0 {10 ns} -r 20ns
run 50us
/altera/uart_top.qsf
0,0 → 1,89
# Copyright (C) 1991-2007 Altera Corporation
# Your use of Altera Corporation's design tools, logic functions
# and other software and tools, and its AMPP partner logic
# functions, and any output files from any of the foregoing
# (including device programming or simulation files), and any
# associated documentation or information are expressly subject
# to the terms and conditions of the Altera Program License
# Subscription Agreement, Altera MegaCore Function License
# Agreement, or other applicable license agreement, including,
# without limitation, that your use is for the sole purpose of
# programming logic devices manufactured by Altera and sold by
# Altera or its authorized distributors. Please refer to the
# applicable agreement for further details.
 
 
# The default values for assignments are stored in the file
# uart_top_assignment_defaults.qdf
# If this file doesn't exist, and for assignments not listed, see file
# assignment_defaults.qdf
 
# Altera recommends that you do not modify this file. This
# file is updated automatically by the Quartus II software
# and any changes you make may be lost or overwritten.
 
 
# Copyright (C) 1991-2007 Altera Corporation
# Your use of Altera Corporation's design tools, logic functions
# and other software and tools, and its AMPP partner logic
# functions, and any output files from any of the foregoing
# (including device programming or simulation files), and any
# associated documentation or information are expressly subject
# to the terms and conditions of the Altera Program License
# Subscription Agreement, Altera MegaCore Function License
# Agreement, or other applicable license agreement, including,
# without limitation, that your use is for the sole purpose of
# programming logic devices manufactured by Altera and sold by
# Altera or its authorized distributors. Please refer to the
# applicable agreement for further details.
 
 
# The default values for assignments are stored in the file
# uart_top_assignment_defaults.qdf
# If this file doesn't exist, and for assignments not listed, see file
# assignment_defaults.qdf
 
# Altera recommends that you do not modify this file. This
# file is updated automatically by the Quartus II software
# and any changes you make may be lost or overwritten.
 
 
set_global_assignment -name DEVICE EP2S60F672C5ES
set_global_assignment -name FAMILY "Stratix II"
set_global_assignment -name TOP_LEVEL_ENTITY uart_test
set_global_assignment -name ORIGINAL_QUARTUS_VERSION "7.1 SP1"
set_global_assignment -name PROJECT_CREATION_TIME_DATE "00:20:04 AUGUST 27, 2007"
set_global_assignment -name LAST_QUARTUS_VERSION "7.1 SP1"
set_global_assignment -name EDA_SIMULATION_TOOL "ModelSim (Verilog)"
set_global_assignment -name EDA_TIME_SCALE "1 ps" -section_id eda_simulation
set_global_assignment -name EDA_OUTPUT_DATA_FORMAT VERILOG -section_id eda_simulation
set_global_assignment -name VERILOG_FILE altpll0.v
set_global_assignment -name VERILOG_FILE uart_test.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_wb.v
set_global_assignment -name VERILOG_FILE ../verilog/timescale.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_debug_if.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_defines.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_receiver.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_regs.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_rfifo.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_sync_flops.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_tfifo.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_top.v
set_global_assignment -name VERILOG_FILE ../verilog/uart_transmitter.v
set_global_assignment -name VERILOG_FILE ../verilog/raminfr.v
set_global_assignment -name PARTITION_NETLIST_TYPE SOURCE -section_id Top
set_instance_assignment -name PARTITION_HIERARCHY no_file_for_top_partition -to | -section_id Top
set_location_assignment PIN_K8 -to stxo_
set_location_assignment PIN_AF15 -to clk_
set_global_assignment -name ENABLE_CLOCK_LATENCY ON
set_global_assignment -name RESERVE_ALL_UNUSED_PINS "AS INPUT TRI-STATED"
set_global_assignment -name DEVICE_MIGRATION_LIST "EP2S60F672C5ES,EP2S60F672C5"
set_location_assignment PIN_AD26 -to led_[7]
set_location_assignment PIN_AD25 -to led_[6]
set_location_assignment PIN_AC25 -to led_[5]
set_location_assignment PIN_AC24 -to led_[4]
set_location_assignment PIN_AB24 -to led_[3]
set_location_assignment PIN_AB23 -to led_[2]
set_location_assignment PIN_AB26 -to led_[1]
set_location_assignment PIN_AB25 -to led_[0]
set_global_assignment -name RESERVE_ALL_UNUSED_PINS_NO_OUTPUT_GND "AS INPUT TRI-STATED"
/altera/altpll0.v
0,0 → 1,318
// megafunction wizard: %ALTPLL%
// GENERATION: STANDARD
// VERSION: WM1.0
// MODULE: altpll
 
// ============================================================
// File Name: altpll0.v
// Megafunction Name(s):
// altpll
//
// Simulation Library Files(s):
// altera_mf
// ============================================================
// ************************************************************
// THIS IS A WIZARD-GENERATED FILE. DO NOT EDIT THIS FILE!
//
// 7.1 Build 178 06/25/2007 SP 1 SJ Full Version
// ************************************************************
 
 
//Copyright (C) 1991-2007 Altera Corporation
//Your use of Altera Corporation's design tools, logic functions
//and other software and tools, and its AMPP partner logic
//functions, and any output files from any of the foregoing
//(including device programming or simulation files), and any
//associated documentation or information are expressly subject
//to the terms and conditions of the Altera Program License
//Subscription Agreement, Altera MegaCore Function License
//Agreement, or other applicable license agreement, including,
//without limitation, that your use is for the sole purpose of
//programming logic devices manufactured by Altera and sold by
//Altera or its authorized distributors. Please refer to the
//applicable agreement for further details.
 
 
// synopsys translate_off
`timescale 1 ps / 1 ps
// synopsys translate_on
module altpll0 (
inclk0,
c0,
locked);
 
input inclk0;
output c0;
output locked;
 
wire [5:0] sub_wire0;
wire sub_wire2;
wire [0:0] sub_wire5 = 1'h0;
wire [0:0] sub_wire1 = sub_wire0[0:0];
wire c0 = sub_wire1;
wire locked = sub_wire2;
wire sub_wire3 = inclk0;
wire [1:0] sub_wire4 = {sub_wire5, sub_wire3};
 
altpll altpll_component (
.inclk (sub_wire4),
.clk (sub_wire0),
.locked (sub_wire2),
.activeclock (),
.areset (1'b0),
.clkbad (),
.clkena ({6{1'b1}}),
.clkloss (),
.clkswitch (1'b0),
.configupdate (1'b1),
.enable0 (),
.enable1 (),
.extclk (),
.extclkena ({4{1'b1}}),
.fbin (1'b1),
.fbmimicbidir (),
.fbout (),
.pfdena (1'b1),
.phasecounterselect ({4{1'b1}}),
.phasedone (),
.phasestep (1'b1),
.phaseupdown (1'b1),
.pllena (1'b1),
.scanaclr (1'b0),
.scanclk (1'b0),
.scanclkena (1'b1),
.scandata (1'b0),
.scandataout (),
.scandone (),
.scanread (1'b0),
.scanwrite (1'b0),
.sclkout0 (),
.sclkout1 (),
.vcooverrange (),
.vcounderrange ());
defparam
altpll_component.bandwidth_type = "AUTO",
altpll_component.clk0_divide_by = 50000000,
altpll_component.clk0_duty_cycle = 50,
altpll_component.clk0_multiply_by = 1843199,
altpll_component.clk0_phase_shift = "0",
altpll_component.compensate_clock = "CLK0",
altpll_component.gate_lock_counter = 100,
altpll_component.gate_lock_signal = "YES",
altpll_component.inclk0_input_frequency = 20000,
altpll_component.intended_device_family = "Stratix II",
altpll_component.invalid_lock_multiplier = 5,
altpll_component.lpm_type = "altpll",
altpll_component.operation_mode = "NORMAL",
altpll_component.pll_type = "AUTO",
altpll_component.port_activeclock = "PORT_UNUSED",
altpll_component.port_areset = "PORT_UNUSED",
altpll_component.port_clkbad0 = "PORT_UNUSED",
altpll_component.port_clkbad1 = "PORT_UNUSED",
altpll_component.port_clkloss = "PORT_UNUSED",
altpll_component.port_clkswitch = "PORT_UNUSED",
altpll_component.port_configupdate = "PORT_UNUSED",
altpll_component.port_fbin = "PORT_UNUSED",
altpll_component.port_inclk0 = "PORT_USED",
altpll_component.port_inclk1 = "PORT_UNUSED",
altpll_component.port_locked = "PORT_USED",
altpll_component.port_pfdena = "PORT_UNUSED",
altpll_component.port_phasecounterselect = "PORT_UNUSED",
altpll_component.port_phasedone = "PORT_UNUSED",
altpll_component.port_phasestep = "PORT_UNUSED",
altpll_component.port_phaseupdown = "PORT_UNUSED",
altpll_component.port_pllena = "PORT_UNUSED",
altpll_component.port_scanaclr = "PORT_UNUSED",
altpll_component.port_scanclk = "PORT_UNUSED",
altpll_component.port_scanclkena = "PORT_UNUSED",
altpll_component.port_scandata = "PORT_UNUSED",
altpll_component.port_scandataout = "PORT_UNUSED",
altpll_component.port_scandone = "PORT_UNUSED",
altpll_component.port_scanread = "PORT_UNUSED",
altpll_component.port_scanwrite = "PORT_UNUSED",
altpll_component.port_clk0 = "PORT_USED",
altpll_component.port_clk1 = "PORT_UNUSED",
altpll_component.port_clk2 = "PORT_UNUSED",
altpll_component.port_clk3 = "PORT_UNUSED",
altpll_component.port_clk4 = "PORT_UNUSED",
altpll_component.port_clk5 = "PORT_UNUSED",
altpll_component.port_clkena0 = "PORT_UNUSED",
altpll_component.port_clkena1 = "PORT_UNUSED",
altpll_component.port_clkena2 = "PORT_UNUSED",
altpll_component.port_clkena3 = "PORT_UNUSED",
altpll_component.port_clkena4 = "PORT_UNUSED",
altpll_component.port_clkena5 = "PORT_UNUSED",
altpll_component.port_enable0 = "PORT_UNUSED",
altpll_component.port_enable1 = "PORT_UNUSED",
altpll_component.port_extclk0 = "PORT_UNUSED",
altpll_component.port_extclk1 = "PORT_UNUSED",
altpll_component.port_extclk2 = "PORT_UNUSED",
altpll_component.port_extclk3 = "PORT_UNUSED",
altpll_component.port_sclkout0 = "PORT_UNUSED",
altpll_component.port_sclkout1 = "PORT_UNUSED",
altpll_component.spread_frequency = 0,
altpll_component.valid_lock_multiplier = 1;
 
 
endmodule
 
// ============================================================
// CNX file retrieval info
// ============================================================
// Retrieval info: PRIVATE: ACTIVECLK_CHECK STRING "0"
// Retrieval info: PRIVATE: BANDWIDTH STRING "1.000"
// Retrieval info: PRIVATE: BANDWIDTH_FEATURE_ENABLED STRING "1"
// Retrieval info: PRIVATE: BANDWIDTH_FREQ_UNIT STRING "MHz"
// Retrieval info: PRIVATE: BANDWIDTH_PRESET STRING "Low"
// Retrieval info: PRIVATE: BANDWIDTH_USE_AUTO STRING "1"
// Retrieval info: PRIVATE: BANDWIDTH_USE_CUSTOM STRING "0"
// Retrieval info: PRIVATE: BANDWIDTH_USE_PRESET STRING "0"
// Retrieval info: PRIVATE: CLKBAD_SWITCHOVER_CHECK STRING "0"
// Retrieval info: PRIVATE: CLKLOSS_CHECK STRING "0"
// Retrieval info: PRIVATE: CLKSWITCH_CHECK STRING "0"
// Retrieval info: PRIVATE: CNX_NO_COMPENSATE_RADIO STRING "0"
// Retrieval info: PRIVATE: CREATE_CLKBAD_CHECK STRING "0"
// Retrieval info: PRIVATE: CREATE_INCLK1_CHECK STRING "0"
// Retrieval info: PRIVATE: CUR_DEDICATED_CLK STRING "c0"
// Retrieval info: PRIVATE: CUR_FBIN_CLK STRING "c0"
// Retrieval info: PRIVATE: DEVICE_SPEED_GRADE STRING "5"
// Retrieval info: PRIVATE: DIV_FACTOR0 NUMERIC "1"
// Retrieval info: PRIVATE: DUTY_CYCLE0 STRING "50.00000000"
// Retrieval info: PRIVATE: EXPLICIT_SWITCHOVER_COUNTER STRING "0"
// Retrieval info: PRIVATE: EXT_FEEDBACK_RADIO STRING "0"
// Retrieval info: PRIVATE: GLOCKED_COUNTER_EDIT_CHANGED STRING "1"
// Retrieval info: PRIVATE: GLOCKED_FEATURE_ENABLED STRING "1"
// Retrieval info: PRIVATE: GLOCKED_MODE_CHECK STRING "1"
// Retrieval info: PRIVATE: GLOCK_COUNTER_EDIT NUMERIC "100"
// Retrieval info: PRIVATE: HAS_MANUAL_SWITCHOVER STRING "1"
// Retrieval info: PRIVATE: INCLK0_FREQ_EDIT STRING "50.000"
// Retrieval info: PRIVATE: INCLK0_FREQ_UNIT_COMBO STRING "MHz"
// Retrieval info: PRIVATE: INCLK1_FREQ_EDIT STRING "100.000"
// Retrieval info: PRIVATE: INCLK1_FREQ_EDIT_CHANGED STRING "1"
// Retrieval info: PRIVATE: INCLK1_FREQ_UNIT_CHANGED STRING "1"
// Retrieval info: PRIVATE: INCLK1_FREQ_UNIT_COMBO STRING "MHz"
// Retrieval info: PRIVATE: INTENDED_DEVICE_FAMILY STRING "Stratix II"
// Retrieval info: PRIVATE: INT_FEEDBACK__MODE_RADIO STRING "1"
// Retrieval info: PRIVATE: LOCKED_OUTPUT_CHECK STRING "1"
// Retrieval info: PRIVATE: LONG_SCAN_RADIO STRING "1"
// Retrieval info: PRIVATE: LVDS_MODE_DATA_RATE STRING "150.000"
// Retrieval info: PRIVATE: LVDS_MODE_DATA_RATE_DIRTY NUMERIC "0"
// Retrieval info: PRIVATE: LVDS_PHASE_SHIFT_UNIT0 STRING "deg"
// Retrieval info: PRIVATE: MULT_FACTOR0 NUMERIC "1"
// Retrieval info: PRIVATE: NORMAL_MODE_RADIO STRING "1"
// Retrieval info: PRIVATE: OUTPUT_FREQ0 STRING "1.84320000"
// Retrieval info: PRIVATE: OUTPUT_FREQ_MODE0 STRING "1"
// Retrieval info: PRIVATE: OUTPUT_FREQ_UNIT0 STRING "MHz"
// Retrieval info: PRIVATE: PHASE_RECONFIG_FEATURE_ENABLED STRING "0"
// Retrieval info: PRIVATE: PHASE_RECONFIG_INPUTS_CHECK STRING "0"
// Retrieval info: PRIVATE: PHASE_SHIFT0 STRING "0.00000000"
// Retrieval info: PRIVATE: PHASE_SHIFT_STEP_ENABLED_CHECK STRING "0"
// Retrieval info: PRIVATE: PHASE_SHIFT_UNIT0 STRING "deg"
// Retrieval info: PRIVATE: PLL_ADVANCED_PARAM_CHECK STRING "0"
// Retrieval info: PRIVATE: PLL_ARESET_CHECK STRING "0"
// Retrieval info: PRIVATE: PLL_AUTOPLL_CHECK NUMERIC "1"
// Retrieval info: PRIVATE: PLL_ENA_CHECK STRING "0"
// Retrieval info: PRIVATE: PLL_ENHPLL_CHECK NUMERIC "0"
// Retrieval info: PRIVATE: PLL_FASTPLL_CHECK NUMERIC "0"
// Retrieval info: PRIVATE: PLL_FBMIMIC_CHECK STRING "0"
// Retrieval info: PRIVATE: PLL_LVDS_PLL_CHECK NUMERIC "0"
// Retrieval info: PRIVATE: PLL_PFDENA_CHECK STRING "0"
// Retrieval info: PRIVATE: PLL_TARGET_HARCOPY_CHECK NUMERIC "0"
// Retrieval info: PRIVATE: PRIMARY_CLK_COMBO STRING "inclk0"
// Retrieval info: PRIVATE: SACN_INPUTS_CHECK STRING "0"
// Retrieval info: PRIVATE: SCAN_FEATURE_ENABLED STRING "1"
// Retrieval info: PRIVATE: SELF_RESET_LOCK_LOSS STRING "0"
// Retrieval info: PRIVATE: SHORT_SCAN_RADIO STRING "0"
// Retrieval info: PRIVATE: SPREAD_FEATURE_ENABLED STRING "1"
// Retrieval info: PRIVATE: SPREAD_FREQ STRING "50.000"
// Retrieval info: PRIVATE: SPREAD_FREQ_UNIT STRING "KHz"
// Retrieval info: PRIVATE: SPREAD_PERCENT STRING "0.500"
// Retrieval info: PRIVATE: SPREAD_USE STRING "0"
// Retrieval info: PRIVATE: SRC_SYNCH_COMP_RADIO STRING "0"
// Retrieval info: PRIVATE: STICKY_CLK0 STRING "1"
// Retrieval info: PRIVATE: SWITCHOVER_COUNT_EDIT NUMERIC "1"
// Retrieval info: PRIVATE: SWITCHOVER_FEATURE_ENABLED STRING "1"
// Retrieval info: PRIVATE: SYNTH_WRAPPER_GEN_POSTFIX STRING "0"
// Retrieval info: PRIVATE: USE_CLK0 STRING "1"
// Retrieval info: PRIVATE: ZERO_DELAY_RADIO STRING "0"
// Retrieval info: LIBRARY: altera_mf altera_mf.altera_mf_components.all
// Retrieval info: CONSTANT: BANDWIDTH_TYPE STRING "AUTO"
// Retrieval info: CONSTANT: CLK0_DIVIDE_BY NUMERIC "50000000"
// Retrieval info: CONSTANT: CLK0_DUTY_CYCLE NUMERIC "50"
// Retrieval info: CONSTANT: CLK0_MULTIPLY_BY NUMERIC "1843199"
// Retrieval info: CONSTANT: CLK0_PHASE_SHIFT STRING "0"
// Retrieval info: CONSTANT: COMPENSATE_CLOCK STRING "CLK0"
// Retrieval info: CONSTANT: GATE_LOCK_COUNTER NUMERIC "100"
// Retrieval info: CONSTANT: GATE_LOCK_SIGNAL STRING "YES"
// Retrieval info: CONSTANT: INCLK0_INPUT_FREQUENCY NUMERIC "20000"
// Retrieval info: CONSTANT: INTENDED_DEVICE_FAMILY STRING "Stratix II"
// Retrieval info: CONSTANT: INVALID_LOCK_MULTIPLIER NUMERIC "5"
// Retrieval info: CONSTANT: LPM_TYPE STRING "altpll"
// Retrieval info: CONSTANT: OPERATION_MODE STRING "NORMAL"
// Retrieval info: CONSTANT: PLL_TYPE STRING "AUTO"
// Retrieval info: CONSTANT: PORT_ACTIVECLOCK STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_ARESET STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_CLKBAD0 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_CLKBAD1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_CLKLOSS STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_CLKSWITCH STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_CONFIGUPDATE STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_FBIN STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_INCLK0 STRING "PORT_USED"
// Retrieval info: CONSTANT: PORT_INCLK1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_LOCKED STRING "PORT_USED"
// Retrieval info: CONSTANT: PORT_PFDENA STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_PHASECOUNTERSELECT STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_PHASEDONE STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_PHASESTEP STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_PHASEUPDOWN STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_PLLENA STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANACLR STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANCLK STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANCLKENA STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANDATA STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANDATAOUT STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANDONE STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANREAD STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_SCANWRITE STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clk0 STRING "PORT_USED"
// Retrieval info: CONSTANT: PORT_clk1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clk2 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clk3 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clk4 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clk5 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena0 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena2 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena3 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena4 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_clkena5 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_enable0 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_enable1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_extclk0 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_extclk1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_extclk2 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_extclk3 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_sclkout0 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: PORT_sclkout1 STRING "PORT_UNUSED"
// Retrieval info: CONSTANT: SPREAD_FREQUENCY NUMERIC "0"
// Retrieval info: CONSTANT: VALID_LOCK_MULTIPLIER NUMERIC "1"
// Retrieval info: USED_PORT: @clk 0 0 6 0 OUTPUT_CLK_EXT VCC "@clk[5..0]"
// Retrieval info: USED_PORT: @extclk 0 0 4 0 OUTPUT_CLK_EXT VCC "@extclk[3..0]"
// Retrieval info: USED_PORT: c0 0 0 0 0 OUTPUT_CLK_EXT VCC "c0"
// Retrieval info: USED_PORT: inclk0 0 0 0 0 INPUT_CLK_EXT GND "inclk0"
// Retrieval info: USED_PORT: locked 0 0 0 0 OUTPUT GND "locked"
// Retrieval info: CONNECT: locked 0 0 0 0 @locked 0 0 0 0
// Retrieval info: CONNECT: @inclk 0 0 1 0 inclk0 0 0 0 0
// Retrieval info: CONNECT: c0 0 0 0 0 @clk 0 0 1 0
// Retrieval info: CONNECT: @inclk 0 0 1 1 GND 0 0 0 0
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0.v TRUE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0.ppf TRUE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0.inc FALSE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0.cmp FALSE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0.bsf TRUE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0_inst.v FALSE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0_bb.v FALSE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0_waveforms.html FALSE FALSE
// Retrieval info: GEN_FILE: TYPE_NORMAL altpll0_wave*.jpg FALSE FALSE
// Retrieval info: LIB_FILE: altera_mf
/altera/uart_test.v
0,0 → 1,189
`include "../verilog/uart_defines.v"
 
module uart_test(clk_, stxo_, led_);
// Module IO ports
input clk_;
output stxo_;
output reg [7:0] led_;
 
// Net declarations
wire clk, boot;
reg [4:0] wb_adr_i;
reg [31:0] wb_dat_i;
wire [31:0] wb_dat_o;
reg [3:0] wb_sel_i;
wire wb_ack_o;
reg wb_rst_i, wb_we_i, wb_stb_i, wb_cyc_i;
 
// Module instantiations
uart_top uart_snd(clk,
wb_rst_i, wb_adr_i, wb_dat_i, wb_dat_o, wb_we_i,
wb_stb_i, wb_cyc_i, wb_ack_o, wb_sel_i, /* int_o */,
stxo_,,
/* rts_o */, 1'b1, /* dtr_o */, 1'b1, 1'b1, 1'b1);
altpll0 pll0(clk_, clk, boot);
 
always @(posedge clk)
if (~boot)
begin
led_ <= 8'd1;
wb_rst_i <= 1'b1;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_sel_i <= 4'hx;
wb_we_i <= 1'hx;
end
else
case (led_)
8'd01: begin wb_rst_i <= 1'b0; led_ <= 8'd02; end
 
// wbm.wb_wr1(`UART_REG_LC, 4'b1000, {8'b10011011, 24'b0});
8'd02: begin
wb_adr_i <= `UART_REG_LC;
wb_dat_i <= {8'b10011011, 24'b0};
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1000;
led_ <= 8'd03;
end
8'd03: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd04;
end
// set dl to divide by 3
// wbm.wb_wr1(`UART_REG_DL1,4'b0001, 32'd2);
8'd04: begin
wb_adr_i <= `UART_REG_DL1;
wb_dat_i <= 32'd3;
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b0001;
led_ <= 8'd05;
end
8'd05: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd06;
end
 
// restore normal registers
// wbm.wb_wr1(`UART_REG_LC, 4'b1000, {8'b00011011, 24'b0});
8'd06: begin
wb_adr_i <= `UART_REG_LC;
wb_dat_i <= {8'b00011011, 24'b0};
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1000;
led_ <= 8'd07;
end
8'd07: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd08;
end
 
// wb_wr1(5'd0, 4'b1, 32'b10000001);
8'd08: begin
wb_adr_i <= 5'd0;
wb_dat_i <= 32'h5a;
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1;
led_ <= 8'd09;
end
8'd09: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd10;
end
 
// wb_wr1(5'd0, 4'b1, 32'b01000010);
8'd10: begin
wb_adr_i <= 5'd0;
wb_dat_i <= 32'h65;
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1;
led_ <= 8'd11;
end
8'd11: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd12;
end
 
8'd12: begin
wb_adr_i <= 5'd0;
wb_dat_i <= 32'h75;
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1;
led_ <= 8'd13;
end
8'd13: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd14;
end
8'd14: begin
wb_adr_i <= 5'd0;
wb_dat_i <= 32'h73;
wb_cyc_i <= 1'b1;
wb_stb_i <= 1'b1;
wb_we_i <= 1'b1;
wb_sel_i <= 4'b1;
led_ <= 8'd15;
end
8'd15: if (wb_ack_o)
begin
wb_cyc_i <= 1'b0;
wb_stb_i <= 1'b0;
wb_adr_i <= 5'bxxxxx;
wb_dat_i <= 32'hxxxx_xxxx;
wb_we_i <= 1'hx;
wb_sel_i <= 4'hx;
led_ <= 8'd16;
end
endcase
 
endmodule

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