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HELP understanding JK circuit

Discussion in 'Homework Help' started by DaffyD, Sep 24, 2008.

  1. DaffyD

    Thread Starter New Member

    Sep 24, 2008
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    I don't understand how a JK flip flop series works. There is a series of 4 circuits all attached to a clock. The starting value is 0000.

    I need to trace it and tell what it does. Diagram is attached.
     
    Last edited: Sep 24, 2008
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    Hint: what will be the state of the Q and ^Q outputs at the initial state?
     
    Last edited: Sep 24, 2008
  3. DaffyD

    Thread Starter New Member

    Sep 24, 2008
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    Everything is set to 0 at start. I understand that but I don't even know how the circuit works.
     
  4. beenthere

    Retired Moderator

    Apr 20, 2004
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    Further hint - if the Q outputs are 0, what must the ^Q outputs be? What happens when you clock the flip flops based on the inputs?
     
  5. DaffyD

    Thread Starter New Member

    Sep 24, 2008
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    Okay, here is what I don't understand specifically. When the clock pulses, does it toggle J or K or both? Or does it toggle J on the rising edge and K on the falling edge? Thanks for your help.
     
  6. beenthere

    Retired Moderator

    Apr 20, 2004
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    Have you looked at a truth table for a J-K flip flop? The state toggles based on the state of the J and K inputs. Get a data sheet for a 7472 to see how they work.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
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