eth_register.v

此文档为采用FPGA实现的以太网MAC层

//////////////////////////////////////////////////////////////////////
////                                                              ////
////  eth_register.v                                              ////
////                                                              ////
////  This file is part of the Ethernet IP core project           ////
////  http://www.opencores.org/projects/ethmac/                   ////
////                                                              ////
////  Author(s):                                                  ////
////      - Igor Mohor ([e-mail])                      ////
////                                                              ////
////  All additional information is avaliable in the Readme.txt   ////
////  file.                                                       ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
////                                                              ////
//// Copyright (C) 2001, 2002 Authors                             ////
////                                                              ////
//// This source file may be used and distributed without         ////
//// restriction provided that this copyright statement is not    ////
//// removed from the file and that any derivative work contains  ////
//// the original copyright notice and the associated disclaimer. ////
////                                                              ////
//// This source file is free software; you can redistribute it   ////
//// and/or modify it under the terms of the GNU Lesser General   ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any   ////
//// later version.                                               ////
////                                                              ////
//// This source is distributed in the hope that it will be       ////
//// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
//// PURPOSE.  See the GNU Lesser General Public License for more ////
//// details.                                                     ////
////                                                              ////
//// You should have received a copy of the GNU Lesser General    ////
//// Public License along with this source; if not, download it   ////
//// from http://www.opencores.org/lgpl.shtml                     ////
////                                                              ////
//////////////////////////////////////////////////////////////////////
//
// CVS Revision History
//
// $Log: eth_register.v,v $
// Revision 1.1  2005/10/05 01:34:00  jdhar
// initial checkin with TSK3000 processor
//
// Revision 1.1  2005/07/31 05:51:11  jdhar
// initial commit for TSK3000 files
//
// Revision 1.6  2002/08/16 22:10:12  mohor
// Synchronous reset added.
//
// Revision 1.5  2002/08/16 12:33:27  mohor
// Parameter ResetValue changed to capital letters.
//
// Revision 1.4  2002/02/26 16:18:08  mohor
// Reset values are passed to registers through parameters
//
// Revision 1.3  2002/01/23 10:28:16  mohor
// Link in the header changed.
//
// Revision 1.2  2001/10/19 08:43:51  mohor
// eth_timescale.v changed to timescale.v This is done because of the
// simulation of the few cores in a one joined project.
//
// Revision 1.1  2001/08/06 14:44:29  mohor
// A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
// Include files fixed to contain no path.
// File names and module names changed ta have a eth_ prologue in the name.
// File eth_timescale.v is used to define timescale
// All pin names on the top module are changed to contain _I, _O or _OE at the end.
// Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
// and Mdo_OE. The bidirectional signal must be created on the top level. This
// is done due to the ASIC tools.
//
//
//
//
//
//
//

`include "timescale.v"


module eth_register(DataIn, DataOut, Write, Clk, Reset, SyncReset);

parameter WIDTH = 8; // default parameter of the register width
parameter RESET_VALUE = 0;

input [WIDTH-1:0] DataIn;

input Write;
input Clk;
input Reset;
input SyncReset;

output [WIDTH-1:0] DataOut;
reg    [WIDTH-1:0] DataOut;



always @ (posedge Clk or posedge Reset)
begin
  if(Reset)
    DataOut<=#1 RESET_VALUE;
  else
  if(SyncReset)
    DataOut<=#1 RESET_VALUE;
  else
  if(Write)                         // write
    DataOut<=#1 DataIn;
end



endmodule   // Register