4-Bit Comparator using IF-ELSE Statements (Behavior Modeling Style)

 4-Bit Comparator using  IF-ELSE Statements (Behavior Modeling Style)

CODES :- 

library IEEE;

use IEEE.STD_LOGIC_1164.all;

entity comparator_4bit is

     port(

         a : in STD_LOGIC_VECTOR(3 downto 0);

         b : in STD_LOGIC_VECTOR(3 downto 0);

         equal : out STD_LOGIC;

         greater : out STD_LOGIC;

         lower : out STD_LOGIC

         );

end comparator_4bit;

architecture comparator_4bit_arc of comparator_4bit is

begin

    comparator : process (a,b) is

    begin

        if (a=b) then

            equal <= '1';

            greater <= '0';

            lower <= '0';

        elsif (a<b) then

            equal <= '0';

            greater <= '0';

            lower <= '1';

        else

            equal <= '0';

            greater <= '1';

            lower <= '0';

        end if;

    end process comparator;

end comparator_4bit_arc

Result : -