Subversion Repositories w11

-- $Id: gen_crc8_tbl.vhd 410 2011-09-18 11:23:09Z mueller $

--

-- Copyright 2007-2011 by Walter F.J. Mueller <W.F.J.Mueller@gsi.de>

--

-- This program is free software; you may redistribute and/or modify it under

-- the terms of the GNU General Public License as published by the Free

-- Software Foundation, either version 2, or at your option any later version.

--

-- This program is distributed in the hope that it will be useful, but

-- WITHOUT ANY WARRANTY, without even the implied warranty of MERCHANTABILITY

-- or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

-- for complete details.

--

------------------------------------------------------------------------------

-- Module Name:    gen_crc8_tbl - sim

-- Description:    stand-alone program to print crc8 transition table

--

-- Dependencies:   comlib/crc8_update (function)

--

-- Revision History: 

-- Date         Rev Version  Comment

-- 2011-09-17   410   1.1    now numeric_std clean; use function crc8_update

-- 2007-10-12    88   1.0.1  avoid ieee.std_logic_unsigned, use cast to unsigned

-- 2007-07-08    65   1.0    Initial version 

------------------------------------------------------------------------------

library ieee;

use ieee.std_logic_1164.all;

use ieee.numeric_std.all;

use std.textio.all;

use work.slvtypes.all;

use work.comlib.all;

entity gen_crc8_tbl is

end gen_crc8_tbl;

architecture sim of gen_crc8_tbl is

begin

  process

    variable crc : slv8 := (others=>'0');

    variable dat : slv8 := (others=>'0');

    variable nxt : slv8 := (others=>'0');

    variable oline : line;

  begin

    for i in 0 to 255 loop

      crc := (others=>'0');

      dat := slv(to_unsigned(i,8));

      nxt := crc8_update(crc, dat);

      write(oline, to_integer(unsigned(nxt)), right, 4);

      if i /= 255 then

        write(oline, string'(","));

      end if;

      if (i mod 8) = 7 then

        writeline(output, oline);

      end if;

    end loop;  -- i

    wait;

  end process;

end sim;