display.vhd

VHDL实现的交通灯程序

library ieee;
use ieee.std_logic_1164.all;

entity Display is
	port(
		num_in:in std_logic_vector(3 downto 0);
		num_out:out std_logic_vector(6 downto 0)
		);
end Display;

architecture Display_arc of Display is
begin
	process(num_in)
	begin 
		case num_in is
			when "0000"=>num_out<="0111111";
			when "0001"=>num_out<="0000110";
			when "0010"=>num_out<="1011011";
			when "0011"=>num_out<="1001111";
			when "0100"=>num_out<="1100110";
			when "0101"=>num_out<="1101101";
			when "0110"=>num_out<="1111101";
			when "0111"=>num_out<="0100111";
			when "1000"=>num_out<="1111111";
			when "1001"=>num_out<="1101111";
			when others=>num_out<="0000000";
		end case;
	end process;
end;