-- -- ------------------------------------------------------------------------------------ -- DESCRIPTION : Flip-flop D type -- Width: 8 -- Clock active: high -- Synchronous clear active: high -- Synchronous set active: high -- Clock enable active: high -- Load active: high ------------------------------------------------------------------------------------ library IEEE; use IEEE.std_logic_1164.all; entity ffd is port ( CLR : in std_logic; SET : in std_logic; CE : in std_logic; LOAD : in std_logic; CLK : in std_logic; DATA_IN : in std_logic_vector (7 downto 0); DATA_OUT : out std_logic_vector (7 downto 0) ); end entity; architecture ffd_arch of ffd is signal TEMP_DATA_OUT: std_logic_vector (7 downto 0); begin process (CLK) begin if rising_edge(CLK) then if CE = '1' then if CLR = '1' then TEMP_DATA_OUT <= (others => '0'); elsif SET = '1' then TEMP_DATA_OUT <= (others => '1'); elsif LOAD = '1' then TEMP_DATA_OUT <= DATA_IN; end if; end if; end if; end process; DATA_OUT <= TEMP_DATA_OUT; end architecture;
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8位数据锁存器
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