help please.......how to catch number

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can someone help me how to design coding that catch number 8 and it will increment the counter..i've done the coding but cannot catch number 8..it will catch random number....

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Why don't you post what you've tried so far.

In VHDL the code would look something like;

constant WIDTH : integer := 4;
signal match : std_logic;
signal match_value : std_logic_vector(WIDTH-1 downto 0) := X"8";
...
match <= '1' when (count = match_value) else '0';

Cheers,

Dave

if Reset='0' then

level<="0000";else

if PUSH'event and PUSH='1' then if X=8 then

if (level < 10) then

level <= level +1;

else

level <= "0000";

end if;

end if;

--can i do like this?

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--can i do like this?

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No, probably not.

You need to use a proper clock and separate the logic into functional blocks;

1) Push button interface, with debounce logic

* synchronize the push-button to the clock

* detect an edge, and then ignore the input for a while

2) A counter

3) Synchronized push-button and match control logic

Create a testbench for your logic, eg., something that contains a clock and a noisy push-button press, and use that to confirm that you only see one button press.

If you don't know how 'noisy' to make your button press, create a simple design and download it into your hardware. Add a SignalTap II instance and capture a trace from a push-button press. You will see that the signal generates multiple transitions when you click on the button. Your debounce logic needs to convert the ugly push-button signal into a nice clean logic level.

Cheers,

Dave