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-- $Id: gray2bin_gen.vhd 418 2011-10-23 20:11:40Z mueller $ -- -- Copyright 2007- 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: gray2bin_gen - syn -- Description: Gray code to binary converter -- -- Dependencies: - -- Test bench: tb/tb_debounce_gen -- Target Devices: generic -- Tool versions: xst 8.1, 8.2, 9.1, 9.2; ghdl 0.18-0.25 -- Revision History: -- Date Rev Version Comment -- 2007-12-26 106 1.0 Initial version ------------------------------------------------------------------------------ library ieee; use ieee.std_logic_1164.all; use work.slvtypes.all; entity gray2bin_gen is -- gray->bin converter, generic vector generic ( DWIDTH : positive := 4); -- data width port ( DI : in slv(DWIDTH-1 downto 0); -- gray code input DO : out slv(DWIDTH-1 downto 0) -- binary code output ); end entity gray2bin_gen; architecture syn of gray2bin_gen is begin proc_comb: process (DI) variable ido : slv(DWIDTH-1 downto 0); begin ido := (others=>'0'); ido(DWIDTH-1) := DI(DWIDTH-1); for i in DWIDTH-2 downto 0 loop ido(i) := ido(i+1) xor DI(i); end loop; DO <= ido; end process proc_comb; end syn;