eth_ocm/eth_register.v

   1 //////////////////////////////////////////////////////////////////////
   2 ////                                                              ////
   3 ////  eth_register.v                                              ////
   4 ////                                                              ////
   5 ////  This file is part of the Ethernet IP core project           ////
   6 ////  http://www.opencores.org/projects/ethmac/                   ////
   7 ////                                                              ////
   8 ////  Author(s):                                                  ////
   9 ////      - Igor Mohor (igorM@opencores.org)                      ////
  10 ////                                                              ////
  11 ////  All additional information is avaliable in the Readme.txt   ////
  12 ////  file.                                                       ////
  13 ////                                                              ////
  14 //////////////////////////////////////////////////////////////////////
  15 ////                                                              ////
  16 //// Copyright (C) 2001, 2002 Authors                             ////
  17 ////                                                              ////
  18 //// This source file may be used and distributed without         ////
  19 //// restriction provided that this copyright statement is not    ////
  20 //// removed from the file and that any derivative work contains  ////
  21 //// the original copyright notice and the associated disclaimer. ////
  22 ////                                                              ////
  23 //// This source file is free software; you can redistribute it   ////
  24 //// and/or modify it under the terms of the GNU Lesser General   ////
  25 //// Public License as published by the Free Software Foundation; ////
  26 //// either version 2.1 of the License, or (at your option) any   ////
  27 //// later version.                                               ////
  28 ////                                                              ////
  29 //// This source is distributed in the hope that it will be       ////
  30 //// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
  31 //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
  32 //// PURPOSE.  See the GNU Lesser General Public License for more ////
  33 //// details.                                                     ////
  34 ////                                                              ////
  35 //// You should have received a copy of the GNU Lesser General    ////
  36 //// Public License along with this source; if not, download it   ////
  37 //// from http://www.opencores.org/lgpl.shtml                     ////
  38 ////                                                              ////
  39 //////////////////////////////////////////////////////////////////////
  40 //
  41 // CVS Revision History
  42 //
  43 // $Log: eth_register.v,v $
  44 // Revision 1.6  2002/08/16 22:10:12  mohor
  45 // Synchronous reset added.
  46 //
  47 // Revision 1.5  2002/08/16 12:33:27  mohor
  48 // Parameter ResetValue changed to capital letters.
  49 //
  50 // Revision 1.4  2002/02/26 16:18:08  mohor
  51 // Reset values are passed to registers through parameters
  52 //
  53 // Revision 1.3  2002/01/23 10:28:16  mohor
  54 // Link in the header changed.
  55 //
  56 // Revision 1.2  2001/10/19 08:43:51  mohor
  57 // eth_timescale.v changed to timescale.v This is done because of the
  58 // simulation of the few cores in a one joined project.
  59 //
  60 // Revision 1.1  2001/08/06 14:44:29  mohor
  61 // A define FPGA added to select between Artisan RAM (for ASIC) and Block Ram (For Virtex).
  62 // Include files fixed to contain no path.
  63 // File names and module names changed ta have a eth_ prologue in the name.
  64 // File eth_timescale.v is used to define timescale
  65 // All pin names on the top module are changed to contain _I, _O or _OE at the end.
  66 // Bidirectional signal MDIO is changed to three signals (Mdc_O, Mdi_I, Mdo_O
  67 // and Mdo_OE. The bidirectional signal must be created on the top level. This
  68 // is done due to the ASIC tools.
  69 //
  70 //
  71 //
  72 //
  73 //
  74 //
  75 //
  76
  77 `include "timescale.v"
  78
  79
  80 module eth_register(DataIn, DataOut, Write, Clk, Reset, SyncReset);
  81
  82 parameter WIDTH = 8; // default parameter of the register width
  83 parameter RESET_VALUE = 0;
  84
  85 input [WIDTH-1:0] DataIn;
  86
  87 input Write;
  88 input Clk;
  89 input Reset;
  90 input SyncReset;
  91
  92 output [WIDTH-1:0] DataOut;
  93 reg    [WIDTH-1:0] DataOut;
  94
  95
  96
  97 always @ (posedge Clk or posedge Reset)
  98 begin
  99   if(Reset)
 100     DataOut<=#1 RESET_VALUE;
 101   else
 102   if(SyncReset)
 103     DataOut<=#1 RESET_VALUE;
 104   else
 105   if(Write)                         // write
 106     DataOut<=#1 DataIn;
 107 end
 108
 109
 110
 111 endmodule   // Register