decoder.vhd

这是一个实现时分秒的时钟功能的源码

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
entity decoder is
port(din:in std_logic_vector(3 downto 0);
     dout:out std_logic_vector(6 downto 0));
end decoder;

architecture Behavioral of decoder is
begin
process(din)
begin
    case din is
      when "0000"=>dout<="0000001";
      when "0001"=>dout<="1001111";
      when "0010"=>dout<="0010010";
      when "0011"=>dout<="0000110";
      when "0100"=>dout<="1001100";
      when "0101"=>dout<="0100100";
      when "0110"=>dout<="0100000";
      when "0111"=>dout<="0001111";
      when "1000"=>dout<="0000000";
      when "1001"=>dout<="0000100";
      when others=>dout<="1111111";
    end case;
end process;
end Behavioral;