-- 庫聲明
library IEEE;
use IEEE.STD_LOGIC_1164.all;
-- 實體聲明
entity switch is
  port (
       din1 : in STD_LOGIC;
       din2 : in STD_LOGIC;
       sel : in STD_LOGIC;
       dout : out STD_LOGIC
  );
end switch;

--}} End of automatically maintained section
-- 結構體
architecture switch of switch is
begin

	-- 使用select語句
	with sel select
	dout <= din1 when '0',
			din2 when others;
			
end switch;