tri_state.vhd.bak

EDA 双向端口的输入输出程序 快点来下在啊

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
ENTITY tri_state IS
PORT (control:IN STD_LOGIC;
     in1:IN STD_LOGIC_VECTOR (8 DOWNTO 0);
      q:INOUT STD_LOGIC_VECTOR (7 DOWNTO 0);
      x: OUT STD_LOGIC_VECTOR (7 DOWNTO 0));
END tri_state;
ARCHITECTURE body_tri OF tri_state IS
BEGIN 
 PROCESS(control,q,in1)
BEGIN  
IF(control='0') THEN x<=q;q<="ZZZZZZZZ";
   ELSE q<=in1;x<="ZZZZZZZZ";

END IF;
END PROCESS;
END body_tri;