Question regaring karnaugh map...

Discussion in 'General Electronics Chat' started by karnough, Aug 4, 2009.

  1. karnough

    Thread Starter New Member

    Aug 4, 2009
    2
    0
    Hi,

    Let's assume we have a 4x4 karnaugh map and all of the cells are marked with don't care sign.
    Is this map equails to "1" or to "0"?
    Can I choose all the don't care cells to be as "1" and then circle them all?

    10x.
     
  2. bearing01

    Member

    Jul 29, 2009
    14
    0
    Yes, don't care's (X) can be considered "1" or "0", whatever makes the most convenient or largest circle/group.
     
  3. karnough

    Thread Starter New Member

    Aug 4, 2009
    2
    0
    but, I'm asking about particular karnaugh map which all the cells are don't care. Does the equation is 1 or 0?
     
  4. count_volta

    Active Member

    Feb 4, 2009
    435
    24
    Why would an entire map be don't cares? What possible use could that have? It can be EITHER 1 or 0 whichever you want.

    But it would be silly. The function would be like, f(A,B,C,D) = 0 or f(A,B,C,D) = 1. What is the use of such a function for anything?
     
  5. t06afre

    AAC Fanatic!

    May 11, 2009
    5,939
    1,222
    It is like you flip a coin and it fall down on egde
     
  6. bearing01

    Member

    Jul 29, 2009
    14
    0
    If you got a k-map with all don't cares that means you don't have any logic or decision table to reduce. You get a 1 output with any input.
     
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