Subversion Repositories graphicsaccelerator

library IEEE;
use IEEE.STD_LOGIC_1164.ALL;
use IEEE.numeric_std.all;
use IEEE.std_logic_unsigned.all;
entity Debouncer is
    Port ( Clk : in  STD_LOGIC;
           Button : in  STD_LOGIC;
			  Dout : out  STD_LOGIC);
end Debouncer;
architecture Behavioral of Debouncer is
signal Counter,nCounter : STD_LOGIC_VECTOR (23 downto 0) := x"000000";
signal ButtonHistory,nButtonHistory : STD_LOGIC_VECTOR (1 downto 0) := "00";
signal nextHistory : STD_LOGIC := '0';
begin
nCounter <= x"FFFFFF" when Counter=x"FFFFFF" and Button='1' else
				x"000000" when Counter=x"000000" and Button='0' else
				Counter+1 when Button='1' else Counter-1;
nextHistory <= '0' when Counter=x"000000" else '1';
nButtonHistory <= nextHistory & ButtonHistory(1);
Dout <= '1' when ButtonHistory="01" else '0';
process (Clk) begin
	if (rising_edge(Clk)) then
		Counter <= nCounter;
		ButtonHistory <= nButtonHistory;
	end if;
end process;
end Behavioral;