library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity MULTIPLEXER is
    Port ( E0  : in  STD_LOGIC;
           E1  : in  STD_LOGIC;
			  E2  : in  STD_LOGIC;
			  E3  : in  STD_LOGIC;
			  SEL : in  STD_LOGIC_VECTOR(1 downto 0);
           RES : out STD_LOGIC);
end MULTIPLEXER;

architecture Behavioral of MULTIPLEXER is

begin

process (SEL,E0,E1,E2,E3)
begin
   case SEL is
      when "00" => RES <= E0;
      when "01" => RES <= E1;
      when "10" => RES <= E2;
      when others => RES <= E3;
   end case;
end process;

end Behavioral;