1 ///////////////////////////////////////////////////////////////////////
3 // Date: Sun Jun 17 06:42:55 2007
5 // Copyright (C) 1999-2003 Easics NV.
6 // This source file may be used and distributed without restriction
7 // provided that this copyright statement is not removed from the file
8 // and that any derivative work contains the original copyright notice
9 // and the associated disclaimer.
11 // THIS SOURCE FILE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS
12 // OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
13 // WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
15 // Purpose: Verilog module containing a synthesizable CRC function
16 // * polynomial: (0 5 12 16)
19 // Info: tools@easics.be
20 // http://www.easics.com
21 ///////////////////////////////////////////////////////////////////////
27 output [15:0] NewCRC);
29 assign NewCRC = nextCRC16_D16(Data,CRC);
31 // polynomial: (0 5 12 16)
33 // convention: the first serial data bit is D[15]
34 function [15:0] nextCRC16_D16;
48 NewCRC[0] = D[12] ^ D[11] ^ D[8] ^ D[4] ^ D[0] ^ C[0] ^ C[4] ^
50 NewCRC[1] = D[13] ^ D[12] ^ D[9] ^ D[5] ^ D[1] ^ C[1] ^ C[5] ^
52 NewCRC[2] = D[14] ^ D[13] ^ D[10] ^ D[6] ^ D[2] ^ C[2] ^ C[6] ^
53 C[10] ^ C[13] ^ C[14];
54 NewCRC[3] = D[15] ^ D[14] ^ D[11] ^ D[7] ^ D[3] ^ C[3] ^ C[7] ^
55 C[11] ^ C[14] ^ C[15];
56 NewCRC[4] = D[15] ^ D[12] ^ D[8] ^ D[4] ^ C[4] ^ C[8] ^ C[12] ^
58 NewCRC[5] = D[13] ^ D[12] ^ D[11] ^ D[9] ^ D[8] ^ D[5] ^ D[4] ^
59 D[0] ^ C[0] ^ C[4] ^ C[5] ^ C[8] ^ C[9] ^ C[11] ^ C[12] ^
61 NewCRC[6] = D[14] ^ D[13] ^ D[12] ^ D[10] ^ D[9] ^ D[6] ^ D[5] ^
62 D[1] ^ C[1] ^ C[5] ^ C[6] ^ C[9] ^ C[10] ^ C[12] ^
64 NewCRC[7] = D[15] ^ D[14] ^ D[13] ^ D[11] ^ D[10] ^ D[7] ^ D[6] ^
65 D[2] ^ C[2] ^ C[6] ^ C[7] ^ C[10] ^ C[11] ^ C[13] ^
67 NewCRC[8] = D[15] ^ D[14] ^ D[12] ^ D[11] ^ D[8] ^ D[7] ^ D[3] ^
68 C[3] ^ C[7] ^ C[8] ^ C[11] ^ C[12] ^ C[14] ^ C[15];
69 NewCRC[9] = D[15] ^ D[13] ^ D[12] ^ D[9] ^ D[8] ^ D[4] ^ C[4] ^
70 C[8] ^ C[9] ^ C[12] ^ C[13] ^ C[15];
71 NewCRC[10] = D[14] ^ D[13] ^ D[10] ^ D[9] ^ D[5] ^ C[5] ^ C[9] ^
72 C[10] ^ C[13] ^ C[14];
73 NewCRC[11] = D[15] ^ D[14] ^ D[11] ^ D[10] ^ D[6] ^ C[6] ^ C[10] ^
74 C[11] ^ C[14] ^ C[15];
75 NewCRC[12] = D[15] ^ D[8] ^ D[7] ^ D[4] ^ D[0] ^ C[0] ^ C[4] ^ C[7] ^
77 NewCRC[13] = D[9] ^ D[8] ^ D[5] ^ D[1] ^ C[1] ^ C[5] ^ C[8] ^ C[9];
78 NewCRC[14] = D[10] ^ D[9] ^ D[6] ^ D[2] ^ C[2] ^ C[6] ^ C[9] ^ C[10];
79 NewCRC[15] = D[11] ^ D[10] ^ D[7] ^ D[3] ^ C[3] ^ C[7] ^ C[10] ^
82 nextCRC16_D16 = NewCRC;