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Status: Verified (1)

RFC 3385, "Internet Protocol Small Computer System Interface (iSCSI) Cyclic Redundancy Check (CRC)/Checksum Considerations", September 2002

Source of RFC: Legacy

Errata ID: 286

Status: Verified
Type: Technical

Reported By: Vicente Cavanna
Date Reported: 2002-11-18

Section 8.1 says:

   ///////////////////////////////////////////////////////////////////////
   // File:  CRC32_D1.v
   // Date:  Mon Nov 18 18:51:31 2002
   //
   // Copyright (C) 1999 Easics NV.
   // This source file may be used and distributed without restriction
   // provided that this copyright statement is not removed from the file
   // and that any derivative work contains the original copyright notice
   // and the associated disclaimer.
   //
   // THIS SOURCE FILE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS
   // OR IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
   // WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
   //
   // Purpose: Verilog module containing a synthesizable CRC function
   //   * polynomial: p(0 to 32) := "100000101111011000111011011110001"
   //   * data width: 1
   //
   // Info: jand@easics.be (Jan Decaluwe)
   //       http://www.easics.com
   ///////////////////////////////////////////////////////////////////////


   module CRC32_D1;
 
     // polynomial: p(0 to 32) := "100000101111011000111011011110001"
     // data width: 1
     function [31:0] nextCRC32_D1;

       input Data;
       input [31:0] CRC;
 
       reg [0:0] D;
       reg [31:0] C;
       reg [31:0] NewCRC;

     begin

       D[0] = Data;
       C = CRC;

       NewCRC[0] = D[0] ^ C[31];
       NewCRC[1] = C[0];
       NewCRC[2] = C[1];
       NewCRC[3] = C[2];
       NewCRC[4] = C[3];
       NewCRC[5] = C[4];
       NewCRC[6] = D[0] ^ C[5] ^ C[31];
       NewCRC[7] = C[6];
       NewCRC[8] = D[0] ^ C[7] ^ C[31];
       NewCRC[9] = D[0] ^ C[8] ^ C[31];
       NewCRC[10] = D[0] ^ C[9] ^ C[31];
       NewCRC[11] = D[0] ^ C[10] ^ C[31];
       NewCRC[12] = C[11];
       NewCRC[13] = D[0] ^ C[12] ^ C[31];
       NewCRC[14] = D[0] ^ C[13] ^ C[31];
       NewCRC[15] = C[14];
       NewCRC[16] = C[15];
       NewCRC[17] = C[16];
       NewCRC[18] = D[0] ^ C[17] ^ C[31];
       NewCRC[19] = D[0] ^ C[18] ^ C[31];
       NewCRC[20] = D[0] ^ C[19] ^ C[31];
       NewCRC[21] = C[20];
       NewCRC[22] = D[0] ^ C[21] ^ C[31];
       NewCRC[23] = D[0] ^ C[22] ^ C[31];
       NewCRC[24] = C[23];
       NewCRC[25] = D[0] ^ C[24] ^ C[31];
       NewCRC[26] = D[0] ^ C[25] ^ C[31];
       NewCRC[27] = D[0] ^ C[26] ^ C[31];
       NewCRC[28] = D[0] ^ C[27] ^ C[31];
       NewCRC[29] = C[28];
       NewCRC[30] = C[29];
       NewCRC[31] = C[30];

       nextCRC32_D1 = NewCRC;

     end

     endfunction

   endmodule

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