ex82.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;
USE    IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY EX82 IS
      GENERIC(SIZE:INTEGER :=8);
     PORT(
           D1,CP :  IN STD_LOGIC;
           Q      :  OUT STD_LOGIC_VECTOR((SIZE-1) DOWNTO 0));
     END EX82;
 ARCHITECTURE A OF EX82 IS
      COMPONENT  DFF 
          PORT(
              D,CLK :  IN STD_LOGIC;
              Q     : OUT STD_LOGIC
               );
     END COMPONENT;
    SIGNAL TEMP :STD_LOGIC_VECTOR(SIZE DOWNTO 0);
      BEGIN
         TEMP(0)<=D1;
     LABEL1:FOR I IN 0 TO 3 GENERATE
            DFFX:DFF PORT MAP (TEMP(I),CP,TEMP(I+1));
          END GENERATE LABEL1; 
      Q<=TEMP(SIZE DOWNTO 1);
     END A;