ex11.vhd

大家一定要看 哦 程序在与多看多练 我找了好久才找到呢

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY EX11 IS
   PORT (
         G     :  IN  STD_LOGIC;
         D     :  IN  STD_LOGIC_VECTOR(3 DOWNTO 0); 
         Q     :  OUT STD_LOGIC_VECTOR(6 DOWNTO 0)
         );  
END  EX11;
ARCHITECTURE  A  OF EX11  IS
     SIGNAL TEMP  :STD_LOGIC_VECTOR(6 DOWNTO 0);
BEGIN
   PROCESS
      BEGIN
      CASE D  IS
         WHEN "0000" => TEMP<="0111111";     ---- 0
         WHEN "0001" => TEMP<="0000110";     ---- 1
         WHEN "0010" => TEMP<="1011010";     ---- 2
         WHEN "0011" => TEMP<="1001111";     ---- 3
         WHEN "0100" => TEMP<="1100110";    ---- 4
         WHEN "0101" => TEMP<="1101101";     ---- 5
         WHEN "0110" => TEMP<="1111100";     ---- 6
         WHEN "0111" => TEMP<="0000000";     ---- 7
         WHEN "1000" => TEMP<="0000000";     ---- 8
         WHEN "1001" => TEMP<="0000000";     ---- 9
         WHEN "1010" => TEMP<="0110000";     ---- A
         WHEN "1011" => TEMP<="0110000";     ---- B
         WHEN "1100" => TEMP<="0110000";     ---- C
         WHEN "1101" => TEMP<="0110000";     ---- D
         WHEN "1110" => TEMP<="0110000";     ---- E
         WHEN "1111" => TEMP<="0110000";     ---- F
         WHEN OTHERS => TEMP<="0000000";
      END CASE;
      IF  G='1' THEN
        Q<=TEMP;
        END IF;
    END PROCESS;   
END   A;