switch.vhd

人民邮电出版社出版的《FPGA硬件接口设计实践》一书的代码

-- 库声明
library IEEE;
use IEEE.STD_LOGIC_1164.all;
-- 实体声明
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
-- 结构体
architecture switch of switch is
begin

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