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1 //////////////////////////////////////////////////////////////////////
2 //// ////
3 //// File name "serr_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) 2000 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_serr_crit.v,v $
45 // Revision 1.1 2007-03-20 17:50:56 sithglan
46 // add shit
47 //
48 // Revision 1.2 2003/02/13 18:26:33 mihad
49 // Cleaned up the code. No functional changes.
50 //
51 // Revision 1.1 2003/01/27 16:49:31 mihad
52 // Changed module and file names. Updated scripts accordingly. FIFO synchronizations changed.
53 //
54 // Revision 1.3 2002/02/01 15:25:13 mihad
55 // Repaired a few bugs, updated specification, added test bench files and design document
56 //
57 // Revision 1.2 2001/10/05 08:14:30 mihad
58 // Updated all files with inclusion of timescale file for simulation purposes.
59 //
60 // Revision 1.1.1.1 2001/10/02 15:33:47 mihad
61 // New project directory structure
62 //
63 //
64
65 // module is used to separate logic which uses criticaly constrained inputs from slower logic.
66 // It is used to synthesize critical timing logic separately with faster cells or without optimization
67
68 // This one is used in parity generator/checker for system error (SERR#) output
69
70 // synopsys translate_off
71 `include "timescale.v"
72 // synopsys translate_on
73
74 module pci_serr_crit
75 (
76 serr_out,
77 non_critical_par_in,
78 pci_par_in,
79 serr_check_in
80 );
81
82 output serr_out ;
83
84 input non_critical_par_in,
85 pci_par_in,
86 serr_check_in ;
87
88 assign serr_out = ~(serr_check_in && ( non_critical_par_in ^ pci_par_in )) ;
89
90 endmodule
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