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Help modifying SR Latch to JK Latch

Discussion in 'Electronic Basics' started by Anon, Feb 11, 2006.

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  1. Anon

    Anon Guest

    Hi,

    I am trying to convert SR latch to JK latch. I have looked up several
    places on the web and I don't understand some of the transition states
    in JK that corresponds to SR latch. When SR=11, the Q(t+1) in SR are
    not determined or not defined. So when you draw K-maps to determine
    what JK input will be fed to SR latch for the modification the
    corresponding state of SR does Q(t) -> Q(t+1) = 1 to dont care. My
    question is what do you assume dont care to be in this case.

    Thanks,

    A
     
  2. Dan Hollands

    Dan Hollands Guest

    You would need to add gates in front of the SR to detect the 11 condition
    and based on the state of the SR outputs enable the enable to the corect
    input to toggle the flip flop


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    Dan Hollands
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  3. Jamie

    Jamie Guest

    JK simply allows toggling of output when
    when JK are both 1
    the RS type are undefined which really means
    i gess it would not respond to any
    change when RS = 1 and Clk goes 1. etc..
    i guess it was just remain at the last
    value.
    i don't know how you would combine the
    actions of JK to RS with out effecting other
    operations.
    you could tie back the Q's to the RS inputs ?
     
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