117 Words1 Page

For example; M = 4 bits, N = 16 bits
If P(j) = 1 (Propagation); then Group(j) will be skipped
X(j): m-bits of group (j)
Y(j): m-bits of group (j)
Cin(j): Carry in to group(j)
Cout(j) = Cin(j+1): Carry out of group(j) = Carry in to next group(j+1)
(j): Group(j) consisting of m-bits numbers to add Fig 5.14: Carry Skip Adder Block diagram
Table 5.3: Carry out Cases Table
Case Xi Yi Xi + Yi Ci+1 Comment Ci = 0 Ci = 1
1 0 0 0 1 0 Kill (STOP) Carry In
2 0 1 1 0 Ci Propagate Carry In (P) 1 0 1 0 Ci
3 1 1 0 1 1 Generate (Carry Out)

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