gratobin.vhd

来自「VHDL子程序集,包括各种例程资料以及源码.」· VHDL 代码 · 共 31 行

--************************************
--*    Gray Code To Binary Convert   *
--*         Component (GENERIC)      *
--*        Filename : GRATOBIN       *
--************************************

library IEEE;
use IEEE.std_logic_1164.all;

entity GRATOBIN is
    generic (number: integer range 0 to 31 := 2);
    port (
          G: in    STD_LOGIC_VECTOR (0 to number - 1);
          B: inout STD_LOGIC_VECTOR (0 to number - 1)
         );
end GRATOBIN;

architecture GRATOBIN_arch of GRATOBIN is

begin
process (G,B)

begin
    B(number - 1) <= G(number - 1);
    for i in number - 2 downto 0 loop
        B(i) <= B(i+1) xor G(i);
    end loop;  
end process;     

end GRATOBIN_arch;