creg.vhd

这个是国外大学的项目代码

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;

entity creg is
    Port ( CLK		: in std_logic;
			  EN		: in std_logic;
			  DI		: in std_logic_vector(7 downto 0);
			  DO		: out std_logic_vector(7 downto 0));
end creg;

architecture Behavioral of creg is

signal iDO : std_logic_vector(7 downto 0) := "00000000";

begin
	
	DO <= iDO;

	process(CLK)
	begin
		if rising_edge(CLK) then
			if EN = '1' then
				iDO <= DI;
			end if;
		end if;
	end process;

end Behavioral;