📄 uart_top.v
字号:
//////////////////////////////////////////////////////////////////////
//// ////
//// 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
//
//
// synopsys translate_off
`define DATA_BUS_WIDTH_8
`define UART_HAS_BAUDRATE_OUTPUT
`include "timescale.v"
// synopsys translate_on
`include "uart_defines.v"
module uart_top (
sys_clk_i,
// processor signals
ad,
addr_high,
addr_low,
wr_n,
rd_n,
ale,
rst,
data_i,
data_o,
// 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 sys_clk_i;
///++++++++++++++processor interface signls++++++++++++++++++++++++++//
input [uart_addr_width-1:0] addr_high; /* MSB Address of the controller */
input wr_n; /* Write strobe and it is active low */
input rd_n; /* read strobe and it is active low */
input ale; /* Address lacth enable */
input rst;
output [uart_addr_width-1:0] addr_low;
inout [uart_addr_width-1:0] ad; /* Address/ Data bi-directional bus */
input [7:0] data_i; //input WISHBONE bus
output [7:0] data_o;
wire [7:0] data_o;
wire [7:0] data_i;
///+++++++++++++++ End if processor interface signls++++++++++++++++++//
// 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;
`ifdef UART_HAS_BAUDRATE_OUTPUT
output baud_o;
`endif
wire stx_pad_o;
wire rts_pad_o;
wire dtr_pad_o;
//
// 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
//+++++++++++++++++++++++++++++++++++++++++++++++++++++//
assign addr_low = ( ale) ? ad : addr_low;
wire [31:0] dat32_o;
//+++++++++++++++++++++++++++++++++++++++++++++++++++++//
// Registers
uart_regs regs(
.clk( sys_clk_i),
.rst_i(rst),
.addr_i(addr_low),
.dat_i(data_i),
.dat_o(data_o),
.we_i(we_n),
.re_i(rd_n),
.modem_inputs( {cts_pad_i, dsr_pad_i,ri_pad_i, dcd_pad_i}),
.stx_pad_o( stx_pad_o ),
.srx_pad_i( srx_pad_i ),
`ifdef DATA_BUS_WIDTH_8
`else// debug interface signals enabled
.ier(ier),
.iir(iir),
.fcr(fcr),
.mcr(mcr),
.lcr(lcr),
.msr(msr),
.lsr(lsr),
.rf_count(rf_count),
.tf_count(tf_count),
.tstate(tstate),
.rstate(rstate),
`endif
.rts_pad_o(rts_pad_o),
.dtr_pad_o(dtr_pad_o),
.int_o(int_o)
`ifdef UART_HAS_BAUDRATE_OUTPUT
.baud_o(baud_o),
`endif
);
`ifdef DATA_BUS_WIDTH_8
`else
uart_debug_if dbg(/*AUTOINST*/
// Outputs
.dat32_o (dat32_o[31:0]),
// Inputs
.adr_i (addr_low[`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
endmodule
/*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*/
⌨️ 快捷键说明
复制代码
Ctrl + C
搜索代码
Ctrl + F
全屏模式
F11
切换主题
Ctrl + Shift + D
显示快捷键
?
增大字号
Ctrl + =
减小字号
Ctrl + -