1 more question:

Discussion in 'Homework Help' started by infinitig35, Mar 4, 2008.

  1. infinitig35

    Thread Starter Member

    Mar 3, 2008
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    What is one method of changing a count up type of asynchronous counter to a count down type of asynchronous counter?
    thanks all
     
  2. Dave

    Retired Moderator

    Nov 17, 2003
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    Each bit in the counter sequence is represented by a cascaded arrangement of JK flip-flops. If the clock at each subsequent JK stage is sourced from the NOT(Q) output (ref. http://sub.allaboutcircuits.com/images/04349.png), then taking Q as the output gives you a count-up counter and NOT(Q) gives you a count-down counter.

    So the answer is toggle between taking your outputs from Q to NOT(Q).

    Dave
     
  3. infinitig35

    Thread Starter Member

    Mar 3, 2008
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    Sounds good Dave. Thanks alot.
     
  4. Dave

    Retired Moderator

    Nov 17, 2003
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  5. infinitig35

    Thread Starter Member

    Mar 3, 2008
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    By the way Dave. I'm taking an electrical engineering course: the title of the book is "Digital Systems, Principles and Logic". All these questions I post on this board will be graded, so hopefully all the answers are correct. Thanks for all your help Dave.

    :)
     
  6. Dave

    Retired Moderator

    Nov 17, 2003
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    We offer no guarantees and ultimately you have responsibility as to whether to trust the answers or not. However I can assure you many of the members here answer from experience and knowledge.

    Good luck with your course. I hope you get time to check our E-book Volume on digital electronics.

    Dave
     
  7. infinitig35

    Thread Starter Member

    Mar 3, 2008
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    Well, I've found a great site here and planning to stay for a long time. Hopefully I can provide some help as I learn more.
    So are you an engineer Dave?

    Nhat
     
  8. Dave

    Retired Moderator

    Nov 17, 2003
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    Welcome aboard! I hope you make use of the resources and experience we have here at AAC.

    Yes I am from apprentice through undergraduate and postgraduate degrees. Sadly my current position makes me do more maths than engineering; hopefully once my current research proposal goes through I can get back to frying stuff and programming!

    Dave
     
  9. infinitig35

    Thread Starter Member

    Mar 3, 2008
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    Sounds great Dave. Hopefully, I'll be where you're at someday. Dave, did you get to check out my other thread, there's some more questions in the other one. I think they're a little trickier. Thanks
     
  10. Dave

    Retired Moderator

    Nov 17, 2003
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    No problem, I will have a look later when I get home from work.

    Dave
     
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