display.vhd

多功能电子钟

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity display is
port( BCDcode : in std_logic_vector(3 downto 0);
      display : out std_logic_vector(6 downto 0));
end entity;

architecture behav of display is
begin
  process(BCDcode)
  begin
      case BCDcode is
        when "0000"=>display<="1000000";
        when "0001"=>display<="1111001";
        when "0010"=>display<="0100100";
        when "0011"=>display<="0110000";
        when "0100"=>display<="0011001";
        when "0101"=>display<="0010010";
        when "0110"=>display<="0000010";
        when "0111"=>display<="1111000";
        when "1000"=>display<="0000000";
        when "1001"=>display<="0011000";
        when others=>display<="1111111";
      end case;
  end process;

end behav;