1 //////////////////////////////////////////////////////////////////////
3 //// can_register_asyn_syn.v ////
6 //// This file is part of the CAN Protocol Controller ////
7 //// http://www.opencores.org/projects/can/ ////
12 //// igorm@opencores.org ////
15 //// All additional information is available in the README.txt ////
18 //////////////////////////////////////////////////////////////////////
20 //// Copyright (C) 2002, 2003, 2004 Authors ////
22 //// This source file may be used and distributed without ////
23 //// restriction provided that this copyright statement is not ////
24 //// removed from the file and that any derivative work contains ////
25 //// the original copyright notice and the associated disclaimer. ////
27 //// This source file is free software; you can redistribute it ////
28 //// and/or modify it under the terms of the GNU Lesser General ////
29 //// Public License as published by the Free Software Foundation; ////
30 //// either version 2.1 of the License, or (at your option) any ////
31 //// later version. ////
33 //// This source is distributed in the hope that it will be ////
34 //// useful, but WITHOUT ANY WARRANTY; without even the implied ////
35 //// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ////
36 //// PURPOSE. See the GNU Lesser General Public License for more ////
39 //// You should have received a copy of the GNU Lesser General ////
40 //// Public License along with this source; if not, download it ////
41 //// from http://www.opencores.org/lgpl.shtml ////
43 //// The CAN protocol is developed by Robert Bosch GmbH and ////
44 //// protected by patents. Anybody who wants to implement this ////
45 //// CAN IP core on silicon has to obtain a CAN protocol license ////
48 //////////////////////////////////////////////////////////////////////
50 // CVS Revision History
52 // $Log: not supported by cvs2svn $
53 // Revision 1.6 2003/03/20 16:52:43 mohor
56 // Revision 1.4 2003/03/11 16:32:34 mohor
57 // timescale.v is used for simulation only.
59 // Revision 1.3 2003/02/09 02:24:33 mohor
60 // Bosch license warning added. Error counters finished. Overload frames
61 // still need to be fixed.
63 // Revision 1.2 2002/12/27 00:12:52 mohor
64 // Header changed, testbench improved to send a frame (crc still missing).
66 // Revision 1.1.1.1 2002/12/20 16:39:21 mohor
72 // synopsys translate_off
73 `include "timescale.v"
74 // synopsys translate_on
77 module can_register_asyn_syn
86 parameter WIDTH = 8; // default parameter of the register width
87 parameter RESET_VALUE = 0;
89 input [WIDTH-1:0] data_in;
95 output [WIDTH-1:0] data_out;
96 reg [WIDTH-1:0] data_out;
100 always @ (posedge clk or posedge rst)
103 data_out<=#1 RESET_VALUE;
104 else if (rst_sync) // synchronous reset
105 data_out<=#1 RESET_VALUE;
106 else if (we) // write
107 data_out<=#1 data_in;