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How To Understand Ex3 Sum Mechanism?

  1. May 7, 2008 #1
    i need to implement a circuit that inputs two 4bit numbers (y3 y2 y1 y0 x3 x2 x1 x0)
    and it has an output of (c3 c2 c1 c0 s3 s2 s1 s0) where "c" is the carry
    and "s" is the sum

    i was given an example in which X=0101 (5) Y=1000 (8) and it outputs
    S=1010 (10) and C=0011 (3)

    i dont know what is the role of C and S
    how do they split the numbers???

    i was asked to implement it using two 4 bit adders

    here is the answer:


    i cant understand this circuit
  2. jcsd
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