kbianma.vhd

数字密码引爆器的输入描述：1、 在开始输入密码以前的等待状态

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;


entity kbianma is 
  port(  EN: in std_logic;
         Y3,Y2,Y1,Y0:OUT std_logic);
end entity;

architecture kbianma_behave of kbianma is

begin
 process
   begin  
    if(EN='1')then
         Y0<='1';Y1<='0';
         Y2<='0';Y3<='1';
    else
         Y0<='0';Y1<='0';
         Y2<='0';Y3<='0';
     end if;
   end process;
end kbianma_behave;