Ripple Carry Adder
carry
in
carry
out
sum
a
b
sum = a XOR b XOR cin
cout = a b + a cin + b cin
a0
b0
a1
b1
a2
b2
c0
c4
S0
S1
S2
a3
b3
S3
+
+
+
+
+
If delay of + is tpd, then delay at c4 is 4 tpd
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