I didn't get what my teacher said about worst case delay. The question sound like this:
Given 4-bit RCA with different delays, find the worst case delay for the adder
tcarry(0->1) = 400pS
tsum(0->1) = 500pS
tcarry(1->0) = 500pS
tsum(1->0) = 600pS
Since the RCA delay formula;
tadder = (N-1)tcarry + tsum
I assume carry will affect more to the overall delay. And my best guess is when A = 0101, B = 0101, worst delay will occurs because carry will change from 1 to 0 two times in the adding process. Am I correct?
Given 4-bit RCA with different delays, find the worst case delay for the adder
tcarry(0->1) = 400pS
tsum(0->1) = 500pS
tcarry(1->0) = 500pS
tsum(1->0) = 600pS
Since the RCA delay formula;
tadder = (N-1)tcarry + tsum
I assume carry will affect more to the overall delay. And my best guess is when A = 0101, B = 0101, worst delay will occurs because carry will change from 1 to 0 two times in the adding process. Am I correct?