mux3.vhd

微波炉控制器的设计

LIBRARY ieee;
USE ieee.std_logic_1164.all;
USE ieee.std_logic_UNSIGNED.all;
ENTITY mux3 IS
PORT(   cook,defrost,bake : IN std_logic;
		en : out std_logic); 
END mux3;
ARCHITECTURE a OF mux3 IS
BEGIN
PROCESS(cook,defrost,bake)	
variable n:std_logic;
BEGIN
IF (cook='1') THEN n:=cook;
elsif (defrost='1') THEN n:=defrost;
elsif  (bake='1') THEN n:=bake;
else n:='0';
end if;
en<=n;
END PROCESS;
END a;