led.vhd

4位电子智能密码锁

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--LED .VHD
LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY LED IS
PORT ( SIN : IN STD_LOGIC;
       RED : OUT STD_LOGIC; 
     GREEN : OUT STD_LOGIC );
END;
ARCHITECTURE ONE OF LED IS
BEGIN
PROCESS (SIN)
BEGIN
IF SIN='0' THEN RED<='1'; GREEN<='0';  --若开锁信号为0，红灯亮
  ELSE RED<='0'; GREEN<='1';          --若开锁信号为1，绿灯亮
END IF;
END PROCESS;
END;