数码管deled.txt

具有多种功能的电子钟：闹钟

library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_unsigned.all;
entity deled is
 port(
     num    :in  std_logic_vector(3 downto 0);
     seg    :out std_logic_vector(6 downto 0));    
end deled;
architecture a of deled is
begin
        --gfedcba
     seg<="0111111"when num=0 else
          "0000110"when num=1 else
          "1011011"when num=2 else
          "1001111"when num=3 else
          "1100110"when num=4 else
          "1101101"when num=5 else
          "1111101"when num=6 else
          "0000111"when num=7 else
          "1111111"when num=8 else
          "1101111"when num=9 else
          "1110111"when num=10 else
          "1111100"when num=11 else
          "0111001"when num=12 else
          "1011110"when num=13 else
          "1111001"when num=14 else
          "1110001"when num=15 else
          "0000000";
end a;