rdff.vhd

来自「4位MCU AM2901的完整VHDL程序」· VHDL 代码 · 共 49 行

-- Set of D-type Flip-Flops
--
-- sizes:(1,size)
--
-- clk --posedge clock input
-- reset --asynchronous reset
-- d --register output
---------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
entity rdff1 is port
(clk,reset:in std_logic;
 d:in std_logic;
 q:buffer std_logic);
end rdff1;

architecture archrdff1 of rdff1 is
begin
process(reset,clk)
begin
if reset='1' then
   q<='0';
elsif rising_edge(clk) then
   q<=d;
end if;
end process;
end archrdff1;
---------------------------------------------
library ieee;
use ieee.std_logic_1164.all;

entity rdff is 
generic (size:integer :=2);
port(clk,reset:in std_logic;
d:in std_logic_vector(size-1 downto 0);
q:buffer std_logic_vector(size-1 downto 0));
end rdff;

architecture archrdff of rdff is
begin
process(reset,clk) 
begin
if reset='1' then
   q<=(others=>'0');
elsif rising_edge(clk) then
   q<=d;
end if;
end process;
end archrdff;