git.zerfleddert.de Git - raggedstone/blob - ethernet/source/pci/pci_async_reset_flop.v

   1 //===========================================================================
   2 // $Id: pci_async_reset_flop.v,v 1.1 2007-03-20 17:50:56 sithglan Exp $
   3 //
   4 //////////////////////////////////////////////////////////////////////
   5 ////                                                              ////
   6 //// async_reset_flop                                             ////
   7 ////                                                              ////
   8 //// This file is part of the general opencores effort.           ////
   9 //// <http://www.opencores.org/cores/misc/>                       ////
  10 ////                                                              ////
  11 //// Module Description:                                          ////
  12 ////                                                              ////
  13 //// Make a rising-edge triggered flop with async reset with a    ////
  14 ////   distinguished name so that it's output can be easily       ////
  15 ////   traced, because it is used for asynchronous reset of some  ////
  16 ////   flip-flops.                                                ////
  17 ////                                                              ////
  18 //// This flop should be used instead of a regular flop for ALL   ////
  19 ////   asynchronous-reset generator flops.                        ////
  20 ////                                                              ////
  21 //// To Do:                                                       ////
  22 //// Nothing                                                      ////
  23 ////                                                              ////
  24 //// Author(s):                                                   ////
  25 ////      - Tadej Markovic, tadej@opencores.org                   ////
  26 ////                                                              ////
  27 //////////////////////////////////////////////////////////////////////
  28 ////                                                              ////
  29 //// Copyright (C) 2001 Authors and OPENCORES.ORG                 ////
  30 ////                                                              ////
  31 //// This source file may be used and distributed without         ////
  32 //// restriction provided that this copyright statement is not    ////
  33 //// removed from the file and that any derivative work contains  ////
  34 //// the original copyright notice and the associated disclaimer. ////
  35 ////                                                              ////
  36 //// This source file is free software; you can redistribute it   ////
  37 //// and/or modify it under the terms of the GNU Lesser General   ////
  38 //// Public License as published by the Free Software Foundation; ////
  39 //// either version 2.1 of the License, or (at your option) any   ////
  40 //// later version.                                               ////
  41 ////                                                              ////
  42 //// This source is distributed in the hope that it will be       ////
  43 //// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
  44 //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
  45 //// PURPOSE. See the GNU Lesser General Public License for more  ////
  46 //// details.                                                     ////
  47 ////                                                              ////
  48 //// You should have received a copy of the GNU Lesser General    ////
  49 //// Public License along with this source; if not, download it   ////
  50 //// from <http://www.opencores.org/lgpl.shtml>                   ////
  51 ////                                                              ////
  52 //////////////////////////////////////////////////////////////////////
  53 //
  54 // CVS Revision History
  55 //
  56 // $Log: pci_async_reset_flop.v,v $
  57 // Revision 1.1  2007-03-20 17:50:56  sithglan
  58 // add shit
  59 //
  60 // Revision 1.1  2003/01/27 16:49:31  mihad
  61 // Changed module and file names. Updated scripts accordingly. FIFO synchronizations changed.
  62 //
  63 // Revision 1.3  2002/08/14 16:44:19  mihad
  64 // Include statement was enclosed in synosys translate off/on directive - repaired
  65 //
  66 // Revision 1.2  2002/02/25 15:15:43  mihad
  67 // Added include statement that was missing and causing errors
  68 //
  69 // Revision 1.1  2002/02/01 14:43:31  mihad
  70 // *** empty log message ***
  71 //
  72 //
  73 //
  74
  75 // synopsys translate_off
  76 `include "timescale.v"
  77 // synopsys translate_on
  78
  79 `include "pci_constants.v"
  80
  81 module pci_async_reset_flop (
  82   data_in, clk_in, async_reset_data_out, reset_in
  83 );
  84
  85 input      data_in;
  86 input      clk_in;
  87 output     async_reset_data_out;
  88 input      reset_in;
  89
  90 reg        async_reset_data_out;
  91
  92 always @(posedge clk_in or posedge reset_in)
  93 begin
  94   if (reset_in)
  95   begin
  96     async_reset_data_out <= #`FF_DELAY 1'b0;
  97   end
  98   else
  99   begin
 100     async_reset_data_out <= #`FF_DELAY data_in;
 101   end
 102 end
 103
 104 endmodule
 105