seg7.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 seg7 is
	PORT(   D0,D1,D2,D3:IN STD_LOGIC;
			Q:OUT STD_LOGIC_vector(6 downto 0));
END seg7;

architecture behave of seg7 is

	signal DL:std_logic_vector(3 downto 0);
begin 
   DL<=D3&D2&D1&D0;
  process(DL)     
    begin
      CASE DL IS
       WHEN "0000"=> Q<="0111111";
	   WHEN "0001"=> Q<="0000110";
       WHEN "0010"=> Q<="1011011";
       WHEN "0011"=> Q<="1001111";
	   WHEN "0100"=> Q<="1100110";
       WHEN "0101"=> Q<="1101101";
       WHEN "0110"=> Q<="1111101";
       WHEN "0111"=> Q<="0000111";
       WHEN "1000"=> Q<="1111111";
	   WHEN "1001"=> Q<="1101111";
       WHEN "1010"=> Q<="1110111";
       WHEN "1011"=> Q<="1111100";
       WHEN "1100"=> Q<="0111001";
       WHEN "1101"=> Q<="1011110";
       WHEN "1110"=> Q<="1111001";
       WHEN "1111"=> Q<="1110001"; 
       WHEN OTHERS=> Q<="0000000";
      END CASE;
    end process;
end behave;