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JonasDC |
----------------------------------------------------------------------
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---- register_n ----
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---- ----
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---- This file is part of the ----
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---- Modular Simultaneous Exponentiation Core project ----
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---- http://www.opencores.org/cores/mod_sim_exp/ ----
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---- ----
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---- Description ----
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JonasDC |
---- n bit register with active high asynchronious reset and ce----
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JonasDC |
---- used in montgommery multiplier systolic array stages ----
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---- ----
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---- Dependencies: none ----
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---- ----
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---- Authors: ----
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---- - Geoffrey Ottoy, DraMCo research group ----
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---- - Jonas De Craene, JonasDC@opencores.org ----
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---- ----
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----------------------------------------------------------------------
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---- ----
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---- Copyright (C) 2011 DraMCo research group and OPENCORES.ORG ----
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---- ----
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---- This source file may be used and distributed without ----
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---- restriction provided that this copyright statement is not ----
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---- removed from the file and that any derivative work contains ----
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---- the original copyright notice and the associated disclaimer. ----
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---- ----
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---- This source file is free software; you can redistribute it ----
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---- and/or modify it under the terms of the GNU Lesser General ----
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---- Public License as published by the Free Software Foundation; ----
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---- either version 2.1 of the License, or (at your option) any ----
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---- later version. ----
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---- ----
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---- This source is distributed in the hope that it will be ----
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---- useful, but WITHOUT ANY WARRANTY; without even the implied ----
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---- warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR ----
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---- PURPOSE. See the GNU Lesser General Public License for more ----
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---- details. ----
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---- ----
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---- You should have received a copy of the GNU Lesser General ----
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---- Public License along with this source; if not, download it ----
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---- from http://www.opencores.org/lgpl.shtml ----
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---- ----
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----------------------------------------------------------------------
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2 |
JonasDC |
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3 |
JonasDC |
library ieee;
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use ieee.std_logic_1164.all;
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use ieee.std_logic_arith.all;
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use ieee.std_logic_unsigned.all;
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7 |
JonasDC |
-- n-bit register with asynchronous reset and clock enable
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2 |
JonasDC |
entity register_n is
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JonasDC |
generic(
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JonasDC |
width : integer := 4
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JonasDC |
);
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port(
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JonasDC |
core_clk : in std_logic; -- clock input
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ce : in std_logic; -- clock enable (active high)
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reset : in std_logic; -- reset (active high)
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JonasDC |
din : in std_logic_vector((width-1) downto 0); -- data in (width)-bit
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dout : out std_logic_vector((width-1) downto 0) -- data out (width)-bit
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JonasDC |
);
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JonasDC |
end register_n;
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JonasDC |
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JonasDC |
architecture Behavorial of register_n is
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JonasDC |
begin
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JonasDC |
-- process for (width)-bit register
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JonasDC |
reg_nb : process (reset, ce, core_clk, din)
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begin
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if reset='1' then -- asynchronous active high reset
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dout <= (others=>'0');
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else
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if rising_edge(core_clk) then -- clock in data on rising edge
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if ce='1' then -- active high clock enable to clock in data
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dout <= din;
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end if;
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end if;
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end if;
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end process;
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end Behavorial;
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