用VHDL语言编写的带进位、置位、复位的D触发器，异步清零D触发器，同步清零D触发器-library ieee use ieee.std_logic_1164.all use ieee.std_logic_unsigned.all entity exp7_10 is port( clk: in std_logic d: in std_logic clr: in std_logic en,s:in std_logic q: o