JK flip flops-truth table

Discussion in 'Homework Help' started by u-will-neva-no, Apr 14, 2011.

  1. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Hello everyone, is there an easier way of obtaining the truth table for the jk flip flop by the means of a truth table?. I have a moore state diagram attached. p.s, sorry for the dodgy drawing XD
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    One might grab a data sheet for a 7473 and simply use the one in it.
     
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  3. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Its just that this was a question from a past paper that I am doing. Internet is not provided in the exam unfortunately!
     
  4. Georacer

    Moderator

    Nov 25, 2009
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  5. t06afre

    AAC Fanatic!

    May 11, 2009
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    Huh.... are you asking this question during your exam....
     
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  6. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Im doing a past paper!
     
  7. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
    230
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    Ok Georace, I have read the post. My problem is that when I do the same for my state transition graph (I noticed that I forgot to loop on my first state in the picture) I do not get the JK truth table. For example, when my inputs are 10, and there is an input of 1, shouldn't the output be from the previous state? I read the previous post and thinking in this manor worked for the first example given...i guess that im reading my state graph wrong because i have labelled my inputs as transitions? If this is the case, how do I read it properly?
     
  8. Georacer

    Moderator

    Nov 25, 2009
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    Your diagram is ok. You haven't marked transitions from 0 for 10 and 11 inputs, but that's not imperative. They can be handled as Don't Care conditions.

    The output of the Moore FSM you posted is always taken from the current state. Not the previous, not the next one. My link has precise directions on how to turn your diagram into a circuit.

    Let's take it step by step. Can you produce the state table, as shown on step 4 of the tutorial? Come back after you do it and post it. Keep in mind that you have only 1 column for current state but two columns in the input section.

    P.S. Please try to make shorter phrases or more coherent ones. I 'm having a hard time reading what you write. Thank you.
     
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  9. u-will-neva-no

    Thread Starter Member

    Mar 22, 2011
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    Sorry for not replying, my internet has been down for a while. I have been able to draw the truth table based Georacer stating that the output is from the current state. Thankyou for the help!
     
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