Up & Down Counter Using Push Buttons

I simply copy and paste this from one of my designs...

You need minor changes to manage up and down clocks instead of mine, which increments only.

library altera;

library IEEE;

use IEEE.std_logic_1164.all;

use ieee.std_logic_unsigned.all;

use IEEE.numeric_std.all; -- for the unsigned type

entity mycounter is

generic ( WIDTH : integer := 8);

port (CLK, RESET, LOAD : in std_logic;

DATA : in unsigned(WIDTH-1 downto 0);

Q : out unsigned(WIDTH-1 downto 0) );

end entity mycounter;

architecture mycounter_a of mycounter is

signal cnt : unsigned(WIDTH-1 downto 0);

begin

process(RESET, CLK)

begin

if RESET = '1' then

cnt <= (others => '0');

elsif rising_edge(CLK) then

if LOAD = '1' then

cnt <= DATA;

else

cnt <= cnt + 1;

end if;

end if;

end process;

Q <= cnt;

end architecture mycounter_a;

Regards

Cris