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---------------------------------------------------------------------- ---- register_n ---- ---- ---- ---- This file is part of the ---- ---- Modular Simultaneous Exponentiation Core project ---- ---- http://www.opencores.org/cores/mod_sim_exp/ ---- ---- ---- ---- Description ---- ---- n bit register with active high asynchronious reset and ce---- ---- used in montgommery multiplier systolic array stages ---- ---- ---- ---- 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; -- n-bit register with asynchronous reset and clock enable entity register_n is generic( width : integer := 4 ); port( core_clk : in std_logic; -- clock input ce : in std_logic; -- clock enable (active high) reset : in std_logic; -- reset (active high) din : in std_logic_vector((width-1) downto 0); -- data in (width)-bit dout : out std_logic_vector((width-1) downto 0) -- data out (width)-bit ); end register_n; architecture Behavorial of register_n is begin -- process for (width)-bit register reg_nb : process (reset, ce, core_clk, din) begin if reset='1' then -- asynchronous active high reset dout <= (others=>'0'); else if rising_edge(core_clk) then -- clock in data on rising edge if ce='1' then -- active high clock enable to clock in data dout <= din; end if; end if; end if; end process; end Behavorial;