Subversion Repositories pci_express_crc

// ===========================================================================

// File    : crc32d16N.v

// Author  : cwinward

// Date    : Sat Dec 8 14:00:37 MST 2007

// Project : TI PHY design

//

// Copyright (c) notice

// This code adheres to the GNU public license

//

// ===========================================================================

//

// $Id: crc32d16N.v,v 1.1.1.1 2007-12-08 22:26:59 cmagleby Exp $

//

// ===========================================================================

//

// $Log: not supported by cvs2svn $

//

// ===========================================================================

// Function :  This provides the lcrc for the end of the pci express TLP 

//             packet.  This is 16 bits in 32 bits out.

//             For more data widths see www.gutzlogic.com

// ===========================================================================

// ===========================================================================

module crc32d16N (/*AUTOARG*/

   // Outputs

   crc32N,

   // Inputs

   clk, resetN, load, d, en

   );

   input        clk;

   input        resetN;

   input        load;  //load the seed value

   input [15:0] d;     //16 bit of tlp data starting with seq. num

   input        en;    //should be high the entire packet.

   output [31:0] crc32N; //inverted and swapped per pci spec.

   wire [31:0]    crc32N;

   assign        crc32N = {~crc32[0],~crc32[1],~crc32[2],~crc32[3],~crc32[4],~crc32[5],~crc32[6],~crc32[7],

                           ~crc32[8],~crc32[9],~crc32[10],~crc32[11],~crc32[12],~crc32[13],~crc32[14],~crc32[15],

                           ~crc32[16],~crc32[17],~crc32[18],~crc32[19],~crc32[20],~crc32[21],~crc32[22],~crc32[23],

                           ~crc32[24],~crc32[25],~crc32[26],~crc32[27],~crc32[28],~crc32[29],~crc32[30],~crc32[31]};

   /*AUTOWIRE*/

   // Beginning of automatic wires (for undeclared instantiated-module outputs)

   wire [31:0]           crc;                    // From make_crc32d16 of crc32d16.v

   // End of automatics

   /* -----\/----- EXCLUDED -----\/-----

   crc32d16 AUTO_TEMPLATE (.init(32'hFFFF_FFFF));

    -----/\----- EXCLUDED -----/\----- */

   crc32d16 make_crc32d16 (/*AUTOINST*/

                           // Outputs

                           .crc         (crc[31:0]),

                           // Inputs

                           .clk         (clk),

                           .resetN      (resetN),

                           .load        (load),

                           .d           (d[15:0]),

                           .init        (32'hFFFF_FFFF),         // Templated

                           .en          (en));

endmodule