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Homework Help: Designing a sequential circuit using JK flip flops

  1. Sep 24, 2015 #1
    1. The problem statement, all variables and given/known data

    :2-bit count-down counter; with two flip-flops and one input

    2. Relevant equations
    When input = 0, the state of the flip-flops does not change.
    When input = 1, the state is 11, 10, 01,11, and repeat.

    3. The attempt at a solution
    Start with truth table, then characteristic table, and then excitation table, then Kmap?
    How do I start deriving the truth table
  2. jcsd
  3. Sep 25, 2015 #2


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    Science Advisor

    The truth table is meaningless here. You need to create a state diagram (for example: [state 0, output 00, state change: On clock transition, next state:...]).
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