Expansion Of Mux?????

Discussion in 'Homework Help' started by dogar sahab, May 25, 2008.

  1. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
    116
    0
    Please help me out im solving the question
    I have to construct quad 9-1- line MUX with four single 8-1- line MUX and one quadruple 2-1- line MUX.The MUX should be interconnected and inputs labelled so that the selection codes 0000 through 1000 can be directly applied to the MUX selection inputs without added logic.
    I dont know what I should do with the unused inputs while constructing larger MUX from smaller MUX??
     
  2. Wendy

    Moderator

    Mar 24, 2008
    20,766
    2,536
    Just ignore the inputs that aren't used. The 2 -1 mux drives the disable lines of the 8 - 1 mux, and the 2-1 mux input becomes part of the binary number.
     
  3. dogar sahab

    Thread Starter Active Member

    Mar 15, 2008
    116
    0
    OKAY..It means that if I have to cnstruct 15-1 line MUX from two 8-1 line MUX,then I should ignore the unused input(16th input) of the second MUX.
    Is it right if I assert this unused input into the 3-input-OR gate which also contains the outputs coming from two(8-1 line MUX)..???
     
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