scanled.vhd

用VHDL实现交通灯的功能 很实用的 我认为比其他的的交通灯程序更好

LIBRARY IEEE;                      
USE IEEE.STD_LOGIC_1164.ALL; 

ENTITY scanled IS
  PORT (
	d:		IN	STD_LOGIC_VECTOR(7 DOWNTO 0);			--输入要显示的数据
	clk1k:	IN	STD_LOGIC;
	seg:	OUT STD_LOGIC_VECTOR(3 DOWNTO 0);			--数码管段输出引脚
	dig:	OUT	STD_LOGIC_VECTOR(1 DOWNTO 0)			--数码管选择输出引脚
  );
END ENTITY;

ARCHITECTURE one OF scanled IS

  BEGIN

    dig <= "01" WHEN clk1k = '0' ELSE "10";
    seg <= d(7 DOWNTO 4) WHEN clk1k = '0' else d(3 DOWNTO 0);

END;