library ieee;
use ieee.std_logic_1164.all;
entity switch_led is
port(key : in std_logic_vector(7 downto 0);
 light : out std_logic_vector(7 downto 0));
end entity switch_led;

architecture behav of switch_led is
 begin
  process(key)
   begin
    for i in 7 downto 0 loop
     light(i) <= key(i);--the led is lighting when the votage is high;
    end loop;
  end process;
 end architecture behav;

评论