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

   1 //////////////////////////////////////////////////////////////////////
   2 ////                                                              ////
   3 ////  File name "pci_io_mux_ad_en_crit.v"                         ////
   4 ////                                                              ////
   5 ////  This file is part of the "PCI bridge" project               ////
   6 ////  http://www.opencores.org/cores/pci/                         ////
   7 ////                                                              ////
   8 ////  Author(s):                                                  ////
   9 ////      - Miha Dolenc (mihad@opencores.org)                     ////
  10 ////                                                              ////
  11 ////  All additional information is avaliable in the README       ////
  12 ////  file.                                                       ////
  13 ////                                                              ////
  14 ////                                                              ////
  15 //////////////////////////////////////////////////////////////////////
  16 ////                                                              ////
  17 //// Copyright (C) 2001 Miha Dolenc, mihad@opencores.org          ////
  18 ////                                                              ////
  19 //// This source file may be used and distributed without         ////
  20 //// restriction provided that this copyright statement is not    ////
  21 //// removed from the file and that any derivative work contains  ////
  22 //// the original copyright notice and the associated disclaimer. ////
  23 ////                                                              ////
  24 //// This source file is free software; you can redistribute it   ////
  25 //// and/or modify it under the terms of the GNU Lesser General   ////
  26 //// Public License as published by the Free Software Foundation; ////
  27 //// either version 2.1 of the License, or (at your option) any   ////
  28 //// later version.                                               ////
  29 ////                                                              ////
  30 //// This source is distributed in the hope that it will be       ////
  31 //// useful, but WITHOUT ANY WARRANTY; without even the implied   ////
  32 //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR      ////
  33 //// PURPOSE.  See the GNU Lesser General Public License for more ////
  34 //// details.                                                     ////
  35 ////                                                              ////
  36 //// You should have received a copy of the GNU Lesser General    ////
  37 //// Public License along with this source; if not, download it   ////
  38 //// from http://www.opencores.org/lgpl.shtml                     ////
  39 ////                                                              ////
  40 //////////////////////////////////////////////////////////////////////
  41 //
  42 // CVS Revision History
  43 //
  44 // $Log: pci_io_mux_ad_en_crit.v,v $
  45 // Revision 1.1  2007-03-20 17:50:56  sithglan
  46 // add shit
  47 //
  48 // Revision 1.2  2003/01/27 16:49:31  mihad
  49 // Changed module and file names. Updated scripts accordingly. FIFO synchronizations changed.
  50 //
  51 // Revision 1.1  2002/02/01 14:43:31  mihad
  52 // *** empty log message ***
  53 //
  54 //
  55
  56 // module provides equation for ad output enables, which uses critical pci bus inputs
  57
  58 // synopsys translate_off
  59 `include "timescale.v"
  60 // synopsys translate_on
  61
  62 // module is provided for ad bus output enable Flip-Flops values
  63 module pci_io_mux_ad_en_crit
  64 (
  65     ad_en_in,
  66     pci_frame_in,
  67     pci_trdy_in,
  68     pci_stop_in,
  69     ad_en_out
  70 );
  71 input  ad_en_in,
  72        pci_frame_in,
  73        pci_trdy_in,
  74        pci_stop_in ;
  75 output ad_en_out ;
  76
  77 assign ad_en_out = ad_en_in && ( ~pci_frame_in || (pci_trdy_in && pci_stop_in) ) ;
  78 endmodule