newbie needs help

Discussion in 'Homework Help' started by Alexia Noir, Aug 27, 2009.

  1. Alexia Noir

    Thread Starter New Member

    Aug 27, 2009
    6
    0
    hi there, i'm a newbie and i would to ask about don't care in boolean function. how do we know it's a don't care? is all that is not listed in the ops and sop consider as don't care? help me please
     
  2. RiJoRI

    Well-Known Member

    Aug 15, 2007
    536
    26
    "Don't Care" means that whether the input is HI or LO, the output will not change. Something like A OR NOT-A is a "Don't Care" function. No matter if A is HI or LO, the result will always be HI.

    --Rich
    Technically, it should be called a "Doesn't Care" circuit...
     
  3. Alexia Noir

    Thread Starter New Member

    Aug 27, 2009
    6
    0
    i see. thank you :). but what if a question just gave a boolean function and was asked to determine the don't care. i was given a sum of product question and was asked to identify its don't care. may i know how?
     
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