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gajos |
-----------------------------------------------------------------------
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---- ----
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---- Montgomery modular multiplier and exponentiator ----
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---- ----
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---- This file is part of the Montgomery modular multiplier ----
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---- and exponentiator project ----
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---- http://opencores.org/project,mod_mult_exp ----
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---- ----
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---- Description: ----
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---- Counter - nothing special. ----
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---- To Do: ----
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---- ----
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---- Author(s): ----
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---- - Krzysztof Gajewski, gajos@opencores.org ----
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---- k.gajewski@gmail.com ----
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---- ----
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-----------------------------------------------------------------------
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---- ----
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---- Copyright (C) 2019 Authors 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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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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use work.properties.ALL;
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-- Uncomment the following library declaration if using
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-- arithmetic functions with Signed or Unsigned values
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--use IEEE.NUMERIC_STD.ALL;
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-- Uncomment the following library declaration if instantiating
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-- any Xilinx primitives in this code.
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--library UNISIM;
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--use UNISIM.VComponents.all;
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entity counter is
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generic(
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size : integer := 4
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);
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port (
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count : in STD_LOGIC;
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zero : in STD_LOGIC;
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output : out STD_LOGIC_VECTOR(size - 1 downto 0);
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clk : in STD_LOGIC;
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reset : in STD_LOGIC
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);
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end counter;
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architecture Behavioral of Counter is
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signal c : STD_LOGIC_VECTOR(size - 1 downto 0);
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begin
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licznik: process (reset,clk)
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begin
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if (clk = '1' and clk'Event) then
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if (reset = '1') then
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c <= (others => '0');
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elsif count = '1' then
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c <= c + 1;
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elsif zero = '1' then
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c <= (others => '0');
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else
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c <= c;
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end if;
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end if;
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end process licznik;
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OUTPUT <= c;
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end Behavioral;
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