Function realisation using MUX,DEC and

Discussion in 'Homework Help' started by xxxyyy, Nov 25, 2011.

  1. xxxyyy

    Thread Starter Member

    Oct 7, 2011
    34
    1
    Problem:
    Realise function F(A,B,C,D)= A*C*D + A*B*D + A*C*D + A*B*D using DEC 3/8, MUX 8/1 and required number of Nor gates. (underlined variables are complements)
    I know how to realise it using only MUX 8/1,but I really have no idea how to use MUX in combination with DEC and NOR to realise function above... Can someone help me?
     
    Last edited: Nov 25, 2011
  2. Yako

    New Member

    Nov 24, 2011
    245
    2
    I could use some help with this one too. :confused:
     
  3. Yako

    New Member

    Nov 24, 2011
    245
    2
    When you formally study digital electronics you are told things like: with an OR any 1 gives a 1, and with a NOR -- any 1 gives a 0.
     
  4. xxxyyy

    Thread Starter Member

    Oct 7, 2011
    34
    1
    I'm not really sure that I understood you well,but never mind :)
     
  5. Georacer

    Moderator

    Nov 25, 2009
    5,142
    1,266
    Supposing that you can use the NOR gates to implement a SoP form with the DeMUX and you have two DeMUXs, consider the following:

    Separate the function into two parts, the one that factorizes with A and the other with A'. Construct each sub-function with a DeMUX. Use the MUX with selector A to select between the outputs of the two functions. A 2/1 MUX would be sufficient here.

    Check if that's ok and come back to tell us.
     
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