xianshi.vhd

停车场显示是日常生活中使用很平常的系统

--利用列扫描信号显示数码管
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity xianshi is
	port(
		clk : in std_logic;
		sel : in std_logic_vector(2 downto 0);
		ledms1: out std_logic_vector(7 downto 0);
		led_s: in std_logic_vector(6 downto 0);
		led_g: in std_logic_vector(6 downto 0);
		led1: out std_logic_vector(6 downto 0)
		);
end xianshi;

architecture xianshi of xianshi is
begin
	process(clk)
	begin
		case sel is
			when "000"=>ledms1<="10000000";  --对应列选择信号，送出相应值
						led1<=led_s;
			when "001"=>ledms1<="01000000";
						led1<=led_g;
			when "010"=>ledms1<="00100000";
						led1<="0000000";
			when "011"=>ledms1<="00010000";
						led1<="0000000";
			when "100"=>ledms1<="00001000";
						led1<="0000000";
			when "101"=>ledms1<="00000100";
						led1<="0000000";
			when "110"=>ledms1<="00000010";
						led1<="0000000";
			when "111"=>ledms1<="00000001";
						led1<="0000000";
			when others=>ledms1<="00000000";
						led1<="0000000";
		end case;
	end process;
end xianshi;