Karnough Map Sum Of Minterms Representation

Discussion in 'Homework Help' started by bellatrix, Jan 18, 2019.

  1. bellatrix

    Thread Starter New Member

    Mar 27, 2018
    11
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    Σm(0,1,2,7)+Σd(4,8) How to show this expression in a Karnough map? What does the second sum(Σd) mean? Is that d mean dont care or something different?
     
  2. WBahn

    Moderator

    Mar 31, 2012
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    7,216
    I've never seen the notation, but "don't care" would seem to be a very good likelihood.
     
  3. ericgibbs

    Moderator

    Jan 29, 2010
    6,797
    1,340
    hi,
    Page #9 of this PDF, defines 'd'
    E
     
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  4. bellatrix

    Thread Starter New Member

    Mar 27, 2018
    11
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    Thank you so much
     
  5. bellatrix

    Thread Starter New Member

    Mar 27, 2018
    11
    1
    I have seen an expression as Σm(0,1,2,7)+Σd(1,8). What to do with m1? Both minterm and dont care?
     
  6. WBahn

    Moderator

    Mar 31, 2012
    23,587
    7,216
    It's probably a typo, so if possible ask for clarification. If that's not possible, since it's both the safest thing to do is treat is as a required minterm. Of course, if the solution assumes it's really a don't care, then you might get marked wrong -- but you've got a really strong case to challenge it.
     
  7. bellatrix

    Thread Starter New Member

    Mar 27, 2018
    11
    1
    It was a question of an exam.. Thanks for help
     
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