Subversion Repositories sdhc-sc-core

// SDHC-SC-Core

// Secure Digital High Capacity Self Configuring Core

//

// (C) Copyright 2010, Rainer Kastl

// All rights reserved.

//

// Redistribution and use in source and binary forms, with or without

// modification, are permitted provided that the following conditions are met:

//     * Redistributions of source code must retain the above copyright

//       notice, this list of conditions and the following disclaimer.

//     * Redistributions in binary form must reproduce the above copyright

//       notice, this list of conditions and the following disclaimer in the

//       documentation and/or other materials provided with the distribution.

//     * Neither the name of the  nor the

//       names of its contributors may be used to endorse or promote products

//       derived from this software without specific prior written permission.

//

// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS  "AS IS" AND

// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

// DISCLAIMED. IN NO EVENT SHALL  BE LIABLE FOR ANY

// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

//

// File        : Crc.sv

// Owner       : Rainer Kastl

// Description : CRC calculations using SD CRC polynoms

// Links       :

//

`ifndef CRC

`define CRC

typedef logic[6:0] aCrc7;

typedef logic[15:0] aCrc16;

function automatic aCrc7 calcCrc7(logic data[$]);

        aCrc7 crc = 0;

        for(int i = 0; i < data.size(); i++) begin

                if (((crc[6] & 1)) != data[i])

                         crc = (crc << 1) ^ 'b10001001;

                else

                         crc <<= 1;

        end

        return crc;

endfunction

function automatic aCrc16 calcCrc16(logic data[$]);

        aCrc16 crc = 0;

        for(int i = 0; i < data.size(); i++) begin

                if (((crc[15] & 1)) != data[i])

                         crc = (crc << 1) ^ 'b10001000000100001;

                else

                         crc <<= 1;

        end

        return crc;

endfunction

`endif