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-- $Id: comlib.vhd 314 2010-07-09 17:38:41Z mueller $
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--
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-- Copyright 2007- by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>
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--
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-- This program is free software; you may redistribute and/or modify it under
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-- the terms of the GNU General Public License as published by the Free
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-- Software Foundation, either version 2, or at your option any later version.
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--
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-- This program is distributed in the hope that it will be useful, but
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-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY
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-- or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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-- for complete details.
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--
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------------------------------------------------------------------------------
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-- Package Name: comlib
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-- Description: communication components
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--
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-- Dependencies: -
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-- Tool versions: xst 8.1, 8.2, 9.1, 9.2, 11.4; ghdl 0.18-0.26
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-- Revision History:
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-- Date Rev Version Comment
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-- 2007-10-12 88 1.2.1 avoid ieee.std_logic_unsigned, use cast to unsigned
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-- 2007-07-08 65 1.2 added procedure crc8_update_tbl
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-- 2007-06-29 61 1.1.1 rename for crc8 SALT->INIT
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-- 2007-06-17 58 1.1 add crc8
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-- 2007-06-03 45 1.0 Initial version
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------------------------------------------------------------------------------
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library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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use work.slvtypes.all;
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package comlib is
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component cdata2byte is -- 9bit comma,data -> byte stream
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generic (
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CPREF : slv4 := "1000"; -- comma prefix
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NCOMM : positive := 4); -- number of comma chars
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port (
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CLK : in slbit; -- clock
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RESET : in slbit; -- reset
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DI : in slv9; -- input data; bit 8 = komma flag
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ENA : in slbit; -- write enable
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BUSY : out slbit; -- write port hold
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DO : out slv8; -- output data
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VAL : out slbit; -- read valid
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HOLD : in slbit -- read hold
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);
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end component;
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component byte2cdata is -- byte stream -> 9bit comma,data
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generic (
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CPREF : slv4 := "1000"; -- comma prefix
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NCOMM : positive := 4); -- number of comma chars
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port (
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CLK : in slbit; -- clock
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RESET : in slbit; -- reset
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DI : in slv8; -- input data
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ENA : in slbit; -- write enable
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BUSY : out slbit; -- write port hold
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DO : out slv9; -- output data; bit 8 = komma flag
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VAL : out slbit; -- read valid
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HOLD : in slbit -- read hold
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);
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end component;
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component crc8 is -- crc-8 generator, checker
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generic (
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INIT: slv8 := "00000000"); -- initial state of crc register
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port (
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CLK : in slbit; -- clock
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RESET : in slbit; -- reset
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ENA : in slbit; -- update enable
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DI : in slv8; -- input data
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CRC : out slv8 -- crc code
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);
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end component;
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procedure crc8_update (crc : inout slv8;
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data : in slv8);
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procedure crc8_update_tbl (crc : inout slv8;
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data : in slv8);
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end comlib;
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-- ----------------------------------------------------------------------------
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package body comlib is
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procedure crc8_update (crc : inout slv8;
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data : in slv8) is
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variable t : slv8 := (others=>'0');
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begin
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t := data xor crc;
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crc(0) := t(0) xor t(4) xor t(5) xor t(6);
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crc(1) := t(1) xor t(5) xor t(6) xor t(7);
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crc(2) := t(0) xor t(2) xor t(4) xor t(5) xor t(7);
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crc(3) := t(0) xor t(1) xor t(3) xor t(4);
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crc(4) := t(0) xor t(1) xor t(2) xor t(6);
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crc(5) := t(1) xor t(2) xor t(3) xor t(7);
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crc(6) := t(2) xor t(3) xor t(4);
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crc(7) := t(3) xor t(4) xor t(5);
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end procedure crc8_update;
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procedure crc8_update_tbl (crc : inout slv8;
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data : in slv8) is
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type crc8_tbl_type is array (0 to 255) of integer;
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variable crc8_tbl : crc8_tbl_type := -- generated with gen_crc8_tbl
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( 0, 29, 58, 39, 116, 105, 78, 83,
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232, 245, 210, 207, 156, 129, 166, 187,
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205, 208, 247, 234, 185, 164, 131, 158,
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37, 56, 31, 2, 81, 76, 107, 118,
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135, 154, 189, 160, 243, 238, 201, 212,
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111, 114, 85, 72, 27, 6, 33, 60,
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74, 87, 112, 109, 62, 35, 4, 25,
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162, 191, 152, 133, 214, 203, 236, 241,
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19, 14, 41, 52, 103, 122, 93, 64,
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251, 230, 193, 220, 143, 146, 181, 168,
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222, 195, 228, 249, 170, 183, 144, 141,
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54, 43, 12, 17, 66, 95, 120, 101,
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148, 137, 174, 179, 224, 253, 218, 199,
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124, 97, 70, 91, 8, 21, 50, 47,
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89, 68, 99, 126, 45, 48, 23, 10,
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177, 172, 139, 150, 197, 216, 255, 226,
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38, 59, 28, 1, 82, 79, 104, 117,
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206, 211, 244, 233, 186, 167, 128, 157,
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235, 246, 209, 204, 159, 130, 165, 184,
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3, 30, 57, 36, 119, 106, 77, 80,
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161, 188, 155, 134, 213, 200, 239, 242,
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73, 84, 115, 110, 61, 32, 7, 26,
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108, 113, 86, 75, 24, 5, 34, 63,
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132, 153, 190, 163, 240, 237, 202, 215,
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53, 40, 15, 18, 65, 92, 123, 102,
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221, 192, 231, 250, 169, 180, 147, 142,
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248, 229, 194, 223, 140, 145, 182, 171,
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16, 13, 42, 55, 100, 121, 94, 67,
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178, 175, 136, 149, 198, 219, 252, 225,
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90, 71, 96, 125, 46, 51, 20, 9,
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127, 98, 69, 88, 11, 22, 49, 44,
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151, 138, 173, 176, 227, 254, 217, 196
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);
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begin
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crc := conv_std_logic_vector(
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crc8_tbl(conv_integer(unsigned(data xor crc))), 8);
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end procedure crc8_update_tbl;
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end package body comlib;
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