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[/] [udp_ipv4_for_10g_ethernet/] [trunk/] [src/] [hdl/] [crc/] [crc32_fast8_tab.vhd] - Rev 3
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-- -- crc32_fast8_tab.vhd: A 32-bit CRC (IEEE) table for processing fixed 8 bits in parallel -- Copyright (C) 2011 CESNET -- Author(s): Lukas Kekely <xkekel00@stud.fit.vutbr.cz> -- -- Redistribution and use in source and binary forms, with or without -- modification, are permitted provided that the following conditions -- are met: -- 1. Redistributions of source code must retain the above copyright -- notice, this list of conditions and the following disclaimer. -- 2. 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. -- 3. Neither the name of the Company 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 ``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 the company or contributors 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. -- -- $Id$ -- -- TODO: -- -- library IEEE; use IEEE.std_logic_1164.all; use IEEE.std_logic_arith.all; use IEEE.std_logic_unsigned.all; use IEEE.numeric_std.all; use WORK.math_pack.all; -- ---------------------------------------------------------------------------- -- Entity declaration -- ---------------------------------------------------------------------------- entity crc32_fast8_tab is port( DI : in std_logic_vector(8-1 downto 0); DO : out std_logic_vector(31 downto 0) ); end entity crc32_fast8_tab; -- ---------------------------------------------------------------------------- -- Architecture declaration -- ---------------------------------------------------------------------------- architecture arch of crc32_fast8_tab is begin -- 32-bit CRC equations processing 8 bits in parallel (VHDL code) -- Generator polynomial: 0x104C11DB7 DO(0) <= DI(2); DO(1) <= DI(0) XOR DI(3); DO(2) <= DI(0) XOR DI(1) XOR DI(4); DO(3) <= DI(1) XOR DI(2) XOR DI(5); DO(4) <= DI(2) XOR DI(3) XOR DI(0) XOR DI(6); DO(5) <= DI(3) XOR DI(4) XOR DI(1) XOR DI(7); DO(6) <= DI(4) XOR DI(5); DO(7) <= DI(5) XOR DI(0) XOR DI(6); DO(8) <= DI(6) XOR DI(1) XOR DI(7); DO(9) <= DI(7); DO(10) <= DI(2); DO(11) <= DI(3); DO(12) <= DI(0) XOR DI(4); DO(13) <= DI(0) XOR DI(1) XOR DI(5); DO(14) <= DI(1) XOR DI(2) XOR DI(6); DO(15) <= DI(2) XOR DI(3) XOR DI(7); DO(16) <= DI(0) XOR DI(2) XOR DI(3) XOR DI(4); DO(17) <= DI(0) XOR DI(1) XOR DI(3) XOR DI(4) XOR DI(5); DO(18) <= DI(1) XOR DI(2) XOR DI(4) XOR DI(5) XOR DI(0) XOR DI(6); DO(19) <= DI(2) XOR DI(3) XOR DI(5) XOR DI(6) XOR DI(1) XOR DI(7); DO(20) <= DI(3) XOR DI(4) XOR DI(6) XOR DI(7); DO(21) <= DI(2) XOR DI(4) XOR DI(5) XOR DI(7); DO(22) <= DI(2) XOR DI(3) XOR DI(5) XOR DI(6); DO(23) <= DI(3) XOR DI(4) XOR DI(6) XOR DI(7); DO(24) <= DI(0) XOR DI(2) XOR DI(4) XOR DI(5) XOR DI(7); DO(25) <= DI(1) XOR DI(2) XOR DI(3) XOR DI(5) XOR DI(0) XOR DI(6); DO(26) <= DI(2) XOR DI(3) XOR DI(4) XOR DI(0) XOR DI(6) XOR DI(1) XOR DI(7); DO(27) <= DI(3) XOR DI(4) XOR DI(5) XOR DI(1) XOR DI(7); DO(28) <= DI(4) XOR DI(5) XOR DI(0) XOR DI(6); DO(29) <= DI(5) XOR DI(0) XOR DI(6) XOR DI(1) XOR DI(7); DO(30) <= DI(0) XOR DI(6) XOR DI(1) XOR DI(7); DO(31) <= DI(1) XOR DI(7); end architecture;