led_one.vhd

来自「led display programme」· VHDL 代码 · 共 40 行

library ieee;
use ieee.std_logic_1164.all;


entity led_one is
		port(clk     	:in std_logic;
			 rst_n   	:in std_logic;
			 show 		:in std_logic_vector	(3 downto 0);
			 led_data	:out std_logic_vector	(7 downto 0)
			);
end led_one;

architecture behave of led_one is
begin
	process(clk,rst_n,show)
	begin
		if rst_n='0' then led_data <= "11000000";
		elsif clk'event and clk='1' then
				case show is
			    when "0000" => led_data <= "11000000";    
			    when "0001" => led_data <= "11111001";    
			    when "0010" => led_data <= "10100100";    
			    when "0011" => led_data <= "10110000";    
			    when "0100" => led_data <= "10011001";    
			    when "0101" => led_data <= "10010010";    
			    when "0110" => led_data <= "10000010";    
			    when "0111" => led_data <= "11111000";    
			    when "1000" => led_data <= "10000000";    
			    when "1001" => led_data <= "10011000";    
			    when "1010" => led_data <= "10001000";    
			    when "1011" => led_data <= "10000011";    
			    when "1100" => led_data <= "11000110";    
			    when "1101" => led_data <= "10100001";    
			    when "1110" => led_data <= "10000110";    
			    when "1111" => led_data <= "10001110";    
			    when others => led_data <= "11000000"; 
				end case;
		end if;
	end process;
end behave;