VHDL Code For Comparator (4 bit)

4-bit comparator

Source Code of 4-bit comparator :-
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;


entity comp1 is
    Port ( A : in  STD_LOGIC_VECTOR (3 downto 0);
           B : in  STD_LOGIC_VECTOR (3 downto 0);


           less : out  STD_LOGIC;
           equal : out  STD_LOGIC;


           greater : out  STD_LOGIC);
end comp1;


architecture Behavioral of comp1 is

begin
process(A,B)
begin
if(A<B)then
less<='1';
equal<='0';
greater<='0';
elsif(A=B)then
less<='0';
equal<='1';
greater<='0';
else
less<='0';
equal<='0';
greater<='1';
end if;
end process;


end Behavioral;