Subversion Repositories uart16550

//////////////////////////////////////////////////////////////////////

////                                                              ////

////  uart_debug_if.v                                             ////

////                                                              ////

////                                                              ////

////  This file is part of the "UART 16550 compatible" project    ////

////  http://www.opencores.org/cores/uart16550/                   ////

////                                                              ////

////  Documentation related to this project:                      ////

////  - http://www.opencores.org/cores/uart16550/                 ////

////                                                              ////

////  Projects compatibility:                                     ////

////  - WISHBONE                                                  ////

////  RS232 Protocol                                              ////

////  16550D uart (mostly supported)                              ////

////                                                              ////

////  Overview (main Features):                                   ////

////  UART core debug interface.                                  ////

////                                                              ////

////  Author(s):                                                  ////

////      - gorban@opencores.org                                  ////

////      - Jacob Gorban                                          ////

////                                                              ////

////  Created:        2001/12/02                                  ////

////                  (See log for the revision history)          ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

////                                                              ////

//// Copyright (C) 2000, 2001 Authors                             ////

////                                                              ////

//// This source file may be used and distributed without         ////

//// restriction provided that this copyright statement is not    ////

//// removed from the file and that any derivative work contains  ////

//// the original copyright notice and the associated disclaimer. ////

////                                                              ////

//// This source file is free software; you can redistribute it   ////

//// and/or modify it under the terms of the GNU Lesser General   ////

//// Public License as published by the Free Software Foundation; ////

//// either version 2.1 of the License, or (at your option) any   ////

//// later version.                                               ////

////                                                              ////

//// This source is distributed in the hope that it will be       ////

//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////

//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////

//// PURPOSE.  See the GNU Lesser General Public License for more ////

//// details.                                                     ////

////                                                              ////

//// You should have received a copy of the GNU Lesser General    ////

//// Public License along with this source; if not, download it   ////

//// from http://www.opencores.org/lgpl.shtml                     ////

////                                                              ////

//////////////////////////////////////////////////////////////////////

//

// CVS Revision History

//

// $Log: not supported by cvs2svn $

// Revision 1.4  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