dff1.vhd.bak

由VHDL 语言实现的D触发器利用的是QUARTUES环境已经得到验证

LIBRARY IEEE;
USE IEEE.STD_LOGIC_1164.ALL;
 ENTITY  dff1 IS
		PORT ( clk : IN STD_LOGIC;
				d  : IN STD_LOGIC;
				q  : OUT STD_LOGIC
				);
END ENTITY dff1;
ARCHITECTURE one OF dff1 IS
SIGNED q1 : STD_LOGIC;
   BEGIN 
PROCESS (clk)
BEGIN 
IF clk'EVENT AND clk ='1'
THEN q1<=d;
END IF;
q<=q1;
END PROCESS;
END one;