[VHDL实例]8位相等比较器

 

-- 8-bit Identity Comparator

-- uses 1993 std VHDL

library IEEE;

use IEEE.Std_log_1164.all;

entity HCT688 is  

   port(Q, P : in std_logic_vector(7 downto 0);

         GBAR : in std_logic; PEQ : out std_logic);

end HCT688;

architecture VER1 of HCT688 is

begin

   PEQ <= '0' when ((To_X01(P) = To_X01(Q)) and (GBAR = '0')) else '1';

end VER1;