FPGA 设计的 VHDL/D 触发器

具有高电平复位、预置和时钟使能的同步正边沿触发 D 触发器

 
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;

entity D_FF_VHDL is
   port
   (
      clk : in std_logic;

      rst : in std_logic;
      pre : in std_logic;
      ce  : in std_logic;
      
      d : in std_logic;

      q : out std_logic
   );
end entity D_FF_VHDL;
 
architecture Behavioral of D_FF_VHDL is

begin
   process (clk) is
   begin
      if rising_edge(clk) then  
         if (rst='1') then   
            q <= '0';
         elsif (pre='1') then
            q <= '1';
         elsif (ce='1') then
            if (d ='1') then
             q <= '1';
         elsif (d ='0') then 
             q<= '0';
            end if;
         end if;
      end if;
   end process;
end architecture Behavioral;

仿真结果

生成的符号

 File:D FF SCH F.png