Truth table for sequential circuits - flip flops

Discussion in 'Homework Help' started by mario_wins, Nov 5, 2008.

  1. mario_wins

    Thread Starter New Member

    Nov 3, 2008
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    I can complete the truth tables for combinational circuits, but i'm having trouble understanding the concept of flip flops. For exmaple in the diagram i have attached i don't get where are the values for the AND gates on the left & how to construct its truth table.
    Thanks for the help.

    [​IMG]
     
    • TTC.JPG
      TTC.JPG
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    Last edited: Nov 5, 2008
  2. mik3

    Senior Member

    Feb 4, 2008
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    The inputs for the AND gates are coming from the output of the flip flops. You have to assume an initial state on the outputs like A=1 and B=0 and start making the truth table.
     
  3. mario_wins

    Thread Starter New Member

    Nov 3, 2008
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    So it would be like this? Then how do you get the next state due to the flip flops?

    A B X
    0 0 0
    0 0 1
    0 1 0
    0 1 1
    1 0 0
    1 0 1
    1 1 0
    1 1 1
     
  4. mik3

    Senior Member

    Feb 4, 2008
    4,846
    63
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