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Debounce.vhd
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Debounce.vhd
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--Copyright (c) 2012 Richard T Stofer
--
--Permission is hereby granted, free of charge, to any person obtaining
--a copy of this software and associated documentation files (the
--"Software"), to deal in the Software without restriction, including
--without limitation the rights to use, copy, modify, merge, publish,
--distribute, sublicense, and/or sell copies of the Software, and to
--permit persons to whom the Software is furnished to do so, subject to
--the following conditions:
--
--The above copyright notice and this permission notice shall be
--included in all copies or substantial portions of the Software.
--
--THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
--EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
--MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
--NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
--LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
--OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
--WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
--
----------------------------------------------------------------------------------
-- Company:
-- Engineer:
--
-- Create Date: 15:54:10 11/30/2006
-- Design Name:
-- Module Name: Debounce - Behavioral
-- Project Name:
-- Target Devices:
-- Tool versions:
-- Description:
--
-- Dependencies:
--
-- Revision:
-- Revision 0.01 - File Created
-- Additional Comments:
--
----------------------------------------------------------------------------------
library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.STD_LOGIC_ARITH.ALL;
use IEEE.STD_LOGIC_UNSIGNED.ALL;
---- Uncomment the following library declaration if instantiating
---- any Xilinx primitives in this code.
--library UNISIM;
--use UNISIM.VComponents.all;
entity Debounce is
Port ( Input : in STD_LOGIC;
Clk : in STD_LOGIC;
Output : out STD_LOGIC);
end Debounce;
architecture Behavioral of Debounce is
signal counter : std_logic_vector(19 downto 0);
signal newstate : std_logic;
begin
process(Input, Clk)
begin
if rising_edge(Clk) then
if Input /= newstate then
newstate <= Input;
counter <= (others => '0');
elsif counter = 500000 then
Output <= Input;
else
counter <= counter + 1;
end if;
end if;
end process;
end Behavioral;