I Cant Understand Where Is My Error Here?

Discussion in 'Homework Help' started by transgalactic, Apr 29, 2008.

  1. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
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  2. Caveman

    Active Member

    Apr 15, 2008
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    Your problem doesn't make sense. You simply didn't get the right answer because you interpreted it differently. In the actual solution only four cases output a zero:
    [0001],[0011],[1001],[1011].
     
  3. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
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    ye i understand that we should take the minimal function from the karno table

    i cant understand how did they build this mux using that function???
     
  4. transgalactic

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    Apr 29, 2008
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  5. Caveman

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    Apr 15, 2008
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    The mux gives the equation:
    Y = !C*!D + B*C*D + !C*D*D + C*!D*D
    The last term is always 0 because !D*D
    The next to last term can drop the second D.
    Then rearranging:
    Y = !C*!D + !C*D + B*C*D
    The first two terms can be combined.
    Y = !C(!D + D) + B*C*D
    The !D + D is always 1 so it can go away.
    Y = !C + B*C*D
    Since !C is covered, the C in the second term is redundant, so it can be removed.
    Y = !C + B*D
     
  6. Papabravo

    Expert

    Feb 24, 2006
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    Because the world is not a fair and just place.
     
  7. Caveman

    Active Member

    Apr 15, 2008
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    Amen, brother.
     
  8. transgalactic

    Thread Starter Active Member

    Apr 29, 2008
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    i understood the proccess when you took some expression
    and transformed it into the minimal formula

    i cant understand how did you got this big expression ???

    i need some how to build a MUX from this minimal function that i got from tha table (i dont know how)
    ???

    on the other hand i have here
    a similar question which is solved by my way (circuling each row)

    http://img166.imageshack.us/my.php?image=img8810ev2.jpg

    is that a wrong way to solve it like that??
     
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