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Homework Help: Mod-11 Ripple Counter

  1. Nov 11, 2007 #1
    1. The problem statement, all variables and given/known data
    Create a mod-11 ripple counter using Flip flops and standard logic gates. Only usable flipflops are T,D, and JK. I've used T.

    2. Relevant equations
    Using Quartus II simulation software

    3. The attempt at a solution

    I have the block diagram all done and the simulation. Everything works fine. Except! When the 4 bits get to decimal 11(when its supposed to reset back to 0), it does with every T-flip flop except the third bit. So the decimal when it "resets" is equal to 4, not zero. It actually changes the third bit from 0, to 1 prematurely. I've attached the block diagram and the simulation waveform file with the error pointed out. Any help or hints would be greatly appreciated! Maybe I'm misunderstanding how the reset input works, but unfortunately I have a very poor teacher and the class is usually left to fend for itself in terms of teaching and clarification.


    Attached Files:

    Last edited: Nov 11, 2007
  2. jcsd
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