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

[Altera_Forum]

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....

[Altera_Forum]

--- Quote Start ---  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....  --- Quote End ---  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

[Altera_Forum]

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?

[Altera_Forum]

--- Quote Start ---   --can i do like this?  --- Quote End ---  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