ex99.vhd

来自「近百个vhdl的器件编程,虽然个别较为简单,但都很实用,对于初学者会有很大帮助」· VHDL 代码 · 共 24 行

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
USE IEEE.STD_LOGIC_UNSIGNED.ALL;
ENTITY EX99 IS
		PORT(
		a		: IN	STD_LOGIC;
	    b	    : OUT STD_LOGIC);
END EX99;
ARCHITECTURE a OF EX99 IS
	BEGIN
	 PROCESS (a)
      BEGIN
        If  a='1' then
           b<='1'  after 200 ns; 
                                      
           END IF;
          END PROCESS;

	END a;