asynchornous counter

Discussion in 'Homework Help' started by 5465da, Dec 28, 2012.

  1. 5465da

    Thread Starter New Member

    Dec 28, 2012
    2
    0
    Question

    1)In an asynchronous counter what is the frequency of the fifth flip flop when the clock input is 128khz?

    Is it 4KHz?
    since there is five flip flop divide by 2, five time?


    2)A 3 bit johnson counter output is 800kHz, what is the input of it?
    Is it 1.6MHz?
    800kHz x 2 =1.6MHz ??????

    I just wan to confirm with the answer
     
    Last edited: Dec 28, 2012
  2. WBahn

    Moderator

    Mar 31, 2012
    17,748
    4,796
    You answer to the first one is sound and so is your reasoning.

    For the second one, describe the behavior of an n-bit Johnson counter. Is that consistent with your reasoning and answer?
     
  3. 5465da

    Thread Starter New Member

    Dec 28, 2012
    2
    0
    second wan
    2x3=6 since it is a johnson counter
    Mod 6
    Formula
    Input= Mod x output
    so 6 x 800khz = 4.8MHz Right????
     
  4. WBahn

    Moderator

    Mar 31, 2012
    17,748
    4,796
    Correct (assuming that by "output frequency" they mean that the counter returns to the same state 800k times per second).
     
    5465da likes this.
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