----------------------------------------------------------------------
---- d_flip_flop ----
---- ----
---- This file is part of the ----
---- Modular Simultaneous Exponentiation Core project ----
---- http://www.opencores.org/cores/mod_sim_exp/ ----
---- ----
---- Description ----
---- 1-bit D flip-flop implemented with behavorial (generic) ----
---- description. With asynchronous active high reset. ----
---- ----
---- Dependencies: none ----
---- ----
---- Authors: ----
---- - Geoffrey Ottoy, DraMCo research group ----
---- - Jonas De Craene, JonasDC@opencores.org ----
---- ----
----------------------------------------------------------------------
---- ----
---- Copyright (C) 2011 DraMCo research group and OPENCORES.ORG ----
---- ----
---- This source file may be used and distributed without ----
---- restriction provided that this copyright statement is not ----
---- removed from the file and that any derivative work contains ----
---- the original copyright notice and the associated disclaimer. ----
---- ----
---- This source file is free software; you can redistribute it ----
---- and/or modify it under the terms of the GNU Lesser General ----
---- Public License as published by the Free Software Foundation; ----
---- either version 2.1 of the License, or (at your option) any ----
---- later version. ----
---- ----
---- This source is distributed in the hope that it will be ----
---- useful, but WITHOUT ANY WARRANTY; without even the implied ----
---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----
---- PURPOSE. See the GNU Lesser General Public License for more ----
---- details. ----
---- ----
---- You should have received a copy of the GNU Lesser General ----
---- Public License along with this source; if not, download it ----
---- from http://www.opencores.org/lgpl.shtml ----
---- ----
----------------------------------------------------------------------
library ieee;
use ieee.std_logic_1164.all;
use ieee.std_logic_arith.all;
use ieee.std_logic_unsigned.all;
-- 1-bit D flip-flop with asynchronous active high reset
entity d_flip_flop is
port(
core_clk : in std_logic; -- clock signal
reset : in std_logic; -- active high reset
din : in std_logic; -- data in
dout : out std_logic -- data out
);
end d_flip_flop;
architecture Behavorial of d_flip_flop is
begin
-- process for 1-bit D flip-flop
d_FF : process (reset, core_clk, din)
begin
if reset='1' then -- asynchronous active high reset
dout <= '0';
else
if rising_edge(core_clk) then -- clock in data on rising edge
dout <= din;
end if;
end if;
end process;
end Behavorial;
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