LIBRARY IEEE;

USE IEEE.STD_LOGIC_1164.ALL;

USE IEEE.STD_LOGIC_UNSIGNED.ALL;

ENTITY BLOG IS

PORT (

Op : IN STD_LOGIC_VECTOR (2 DOWNTO 0);

A,B : IN STD_LOGIC_VECTOR (7 DOWNTO

0);

R : OUT STD_LOGIC_VECTOR (7 DOWNTO 0));

END BLOG;

ARCHITECTURE COMP OF BLOG IS

BEGIN

P1 : PROCESS (Op,A,B)

BEGIN

CASE Op IS

WHEN "001" => R <= A + B;

WHEN "010" => R <= A - B;

WHEN "011" => R <= A OR B;

WHEN "100" => R <= A AND B;

WHEN "101" => R <= A XOR B;

WHEN "110" => R <= NOT(A);

WHEN "111" => R <= "00000000";

WHEN OTHERS => R <= "11111111";

END CASE;

END PROCESS P1;

END COMP;