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Homework Help: Full adder with look ahead carry

  1. Nov 2, 2011 #1
    1. The problem statement, all variables and given/known data
    Draw the logic block for the third cell (s2) if a full adder with carry look ahead show all inputs and output
    write equation for Go Po So using inputs of AoBoCo


    2. Relevant equations



    3. The attempt at a solution
    here is what i have, is this what they are asking?
    here is a image
    http://imageshack.us/photo/my-images/835/img0062jx.jpg/

    ok so looking online it seems like im missing the lookahead on the bottom right it would look like this
    http://en.wikipedia.org/wiki/File:4-bit_carry_lookahead_adder.svg

    For the other part,
    Po=Ao+Bo
    Go=Ao*Bo
    So=Ao+Bo+Cio
     
    Last edited: Nov 2, 2011
  2. jcsd
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