diff options
Diffstat (limited to 'opencores/uart16550/rtl/verilog')
| -rw-r--r-- | opencores/uart16550/rtl/verilog/CVS/Entries | 13 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/CVS/Repository | 1 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/CVS/Root | 1 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/CVS/Template | 0 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/raminfr.v | 114 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/timescale.v | 64 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_debug_if.v | 129 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_defines.v | 250 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_receiver.v | 485 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_regs.v | 903 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_rfifo.v | 323 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_sync_flops.v | 125 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_tfifo.v | 246 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_top.v | 337 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_transmitter.v | 355 | ||||
| -rw-r--r-- | opencores/uart16550/rtl/verilog/uart_wb.v | 308 |
16 files changed, 0 insertions, 3654 deletions
diff --git a/opencores/uart16550/rtl/verilog/CVS/Entries b/opencores/uart16550/rtl/verilog/CVS/Entries deleted file mode 100644 index 924308393..000000000 --- a/opencores/uart16550/rtl/verilog/CVS/Entries +++ /dev/null @@ -1,13 +0,0 @@ -/raminfr.v/1.2/Mon Jul 29 21:16:18 2002// -/timescale.v/1.6/Fri Aug 24 21:01:12 2001// -/uart_debug_if.v/1.5/Mon Jul 29 21:16:18 2002// -/uart_defines.v/1.14/Fri Sep 12 07:26:58 2003// -/uart_receiver.v/1.31/Fri Jun 18 14:46:15 2004// -/uart_regs.v/1.42/Mon Nov 22 09:21:59 2004// -/uart_rfifo.v/1.4/Fri Jul 11 18:20:26 2003// -/uart_sync_flops.v/1.1/Fri May 21 11:43:25 2004// -/uart_tfifo.v/1.2/Mon Jul 29 21:16:18 2002// -/uart_top.v/1.19/Mon Jul 29 21:16:18 2002// -/uart_transmitter.v/1.19/Mon Jul 29 21:16:18 2002// -/uart_wb.v/1.17/Fri May 21 12:35:15 2004// -D diff --git a/opencores/uart16550/rtl/verilog/CVS/Repository b/opencores/uart16550/rtl/verilog/CVS/Repository deleted file mode 100644 index b0efc9dbb..000000000 --- a/opencores/uart16550/rtl/verilog/CVS/Repository +++ /dev/null @@ -1 +0,0 @@ -uart16550/rtl/verilog diff --git a/opencores/uart16550/rtl/verilog/CVS/Root b/opencores/uart16550/rtl/verilog/CVS/Root deleted file mode 100644 index 44b2aa23b..000000000 --- a/opencores/uart16550/rtl/verilog/CVS/Root +++ /dev/null @@ -1 +0,0 @@ -:pserver:anonymous@cvs.opencores.org:/cvsroot/anonymous diff --git a/opencores/uart16550/rtl/verilog/CVS/Template b/opencores/uart16550/rtl/verilog/CVS/Template deleted file mode 100644 index e69de29bb..000000000 --- a/opencores/uart16550/rtl/verilog/CVS/Template +++ /dev/null diff --git a/opencores/uart16550/rtl/verilog/raminfr.v b/opencores/uart16550/rtl/verilog/raminfr.v deleted file mode 100644 index bd376d5d5..000000000 --- a/opencores/uart16550/rtl/verilog/raminfr.v +++ /dev/null @@ -1,114 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: raminfr.v,v $ -// 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 - diff --git a/opencores/uart16550/rtl/verilog/timescale.v b/opencores/uart16550/rtl/verilog/timescale.v deleted file mode 100644 index 051ee7a51..000000000 --- a/opencores/uart16550/rtl/verilog/timescale.v +++ /dev/null @@ -1,64 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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 diff --git a/opencores/uart16550/rtl/verilog/uart_debug_if.v b/opencores/uart16550/rtl/verilog/uart_debug_if.v deleted file mode 100644 index 3c8ac1aad..000000000 --- a/opencores/uart16550/rtl/verilog/uart_debug_if.v +++ /dev/null @@ -1,129 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_debug_if.v,v $ -// 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 - diff --git a/opencores/uart16550/rtl/verilog/uart_defines.v b/opencores/uart16550/rtl/verilog/uart_defines.v deleted file mode 100644 index 8b372cb5a..000000000 --- a/opencores/uart16550/rtl/verilog/uart_defines.v +++ /dev/null @@ -1,250 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_defines.v,v $ -// 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 - - - - - - - diff --git a/opencores/uart16550/rtl/verilog/uart_receiver.v b/opencores/uart16550/rtl/verilog/uart_receiver.v deleted file mode 100644 index a11d374ce..000000000 --- a/opencores/uart16550/rtl/verilog/uart_receiver.v +++ /dev/null @@ -1,485 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_receiver.v,v $ -// 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 - 1; // 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 - 1; -end - -endmodule diff --git a/opencores/uart16550/rtl/verilog/uart_regs.v b/opencores/uart16550/rtl/verilog/uart_regs.v deleted file mode 100644 index 087524abc..000000000 --- a/opencores/uart16550/rtl/verilog/uart_regs.v +++ /dev/null @@ -1,903 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_regs.v,v $ -// 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; - - wire rf_push_pulse, rf_overrun; -// 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 - -// Why is this here? Empty should be signalled in the fifo itself, - // to properly account for fifo length parameters - -assign lsr5 = (tf_count!=5'b01111); // transmitter fifo is not full -assign lsr6 = (tf_count==5'b0 && thre_set_en && (tstate == /*`S_IDLE */ 0)); // transmitter completely 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) ? 0 : // 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 ? 0 : 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 ? 0 : 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 ? 0 : 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 ? 0 : 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 lsr5; - //else lsr5r <= #1 (fifo_write) ? 0 : 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) ? 0 : 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 ? 0 : 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 - 1; // preset counter - else - dlc <= #1 dlc - 1; // 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 - 1; // 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 ? 0 : // reset condition - rls_int_rise ? 1 : // 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) ? 0 : // reset condition - rda_int_rise ? 1 : // 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)? 0 : - thre_int_rise ? 1 : - 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 ? 0 : - ms_int_rise ? 1 : - 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 ? 0 : - ti_int_rise ? 1 : - 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 : - ti_int_pnd ? ~fifo_read : - thre_int_pnd ? !(fifo_write & iir_read) : - ms_int_pnd ? ~msr_read : - 0; // 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 diff --git a/opencores/uart16550/rtl/verilog/uart_rfifo.v b/opencores/uart16550/rtl/verilog/uart_rfifo.v deleted file mode 100644 index 21e9d25ed..000000000 --- a/opencores/uart16550/rtl/verilog/uart_rfifo.v +++ /dev/null @@ -1,323 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_rfifo.v,v $ -// 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 diff --git a/opencores/uart16550/rtl/verilog/uart_sync_flops.v b/opencores/uart16550/rtl/verilog/uart_sync_flops.v deleted file mode 100644 index a822f26dc..000000000 --- a/opencores/uart16550/rtl/verilog/uart_sync_flops.v +++ /dev/null @@ -1,125 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_sync_flops.v,v $ -// 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 diff --git a/opencores/uart16550/rtl/verilog/uart_tfifo.v b/opencores/uart16550/rtl/verilog/uart_tfifo.v deleted file mode 100644 index 9b369aacf..000000000 --- a/opencores/uart16550/rtl/verilog/uart_tfifo.v +++ /dev/null @@ -1,246 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_tfifo.v,v $ -// 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 diff --git a/opencores/uart16550/rtl/verilog/uart_top.v b/opencores/uart16550/rtl/verilog/uart_top.v deleted file mode 100644 index e57ca8e4c..000000000 --- a/opencores/uart16550/rtl/verilog/uart_top.v +++ /dev/null @@ -1,337 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_top.v,v $ -// 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 -// -// - -`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(// 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 // uart_top - diff --git a/opencores/uart16550/rtl/verilog/uart_transmitter.v b/opencores/uart16550/rtl/verilog/uart_transmitter.v deleted file mode 100644 index e27e6998e..000000000 --- a/opencores/uart16550/rtl/verilog/uart_transmitter.v +++ /dev/null @@ -1,355 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_transmitter.v,v $ -// 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 - reg [`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; - -always @(posedge clk) - 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 diff --git a/opencores/uart16550/rtl/verilog/uart_wb.v b/opencores/uart16550/rtl/verilog/uart_wb.v deleted file mode 100644 index daf436453..000000000 --- a/opencores/uart16550/rtl/verilog/uart_wb.v +++ /dev/null @@ -1,308 +0,0 @@ -////////////////////////////////////////////////////////////////////// -//// //// -//// 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: uart_wb.v,v $ -// 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 -// - -`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_ack_o; - //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 |