Given the following: The adder propagation delay is 2ns, the register setup time

Question

Given the following: The adder propagation delay is 2ns, the register setup time is 1 ns, the register clk-to-q is 1ns, and the clock frequency is 400MHz. Will the accumulator function correctly? If not, what would you suggest changing to fix the problem?

Given the following: The adder propagation delay is 2ns, the register setup time is 1 ns, the register clk-to-q is 1ns, and the clock frequency is 400MHz. Will the accumulator function correctly? If not, what would you suggest changing to fix the problem?

Explanation / Answer

total delay D = 2+1+1 = 4ns

time period of clk T = 1/(400M) = 2.5 n

D>T

hence the accumulator does not function correctly

Make Tmime period T = 4 ns

So

frequency of clock = 1/(4 n) = 250 MHz

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