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// SDHC-SC-Core
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// Secure Digital High Capacity Self Configuring Core
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//
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// (C) Copyright 2010, Rainer Kastl
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above copyright
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// notice, this list of conditions and the following disclaimer in the
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// documentation and/or other materials provided with the distribution.
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// * Neither the name of the nor the
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// names of its contributors may be used to endorse or promote products
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// derived from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL BE LIABLE FOR ANY
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// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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// File : Crc.sv
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// Owner : Rainer Kastl
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// Description : CRC calculations using SD CRC polynoms
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// Links :
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//
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`ifndef CRC
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`define CRC
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typedef logic[6:0] aCrc7;
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typedef logic[15:0] aCrc16;
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function automatic aCrc7 calcCrc7(logic data[$]);
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aCrc7 crc = 0;
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for(int i = 0; i < data.size(); i++) begin
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if (((crc[6] & 1)) != data[i])
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crc = (crc << 1) ^ 'b10001001;
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else
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crc <<= 1;
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end
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return crc;
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endfunction
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function automatic aCrc16 calcCrc16(logic data[$]);
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aCrc16 crc = 0;
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for(int i = 0; i < data.size(); i++) begin
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if (((crc[15] & 1)) != data[i])
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crc = (crc << 1) ^ 'b10001000000100001;
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else
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crc <<= 1;
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end
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return crc;
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endfunction
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`endif
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