Question: Consider the following circuit where the combinational circuit is represented by COMB and clock skew is represented by t skew . Given the following parameters:

Consider the following circuit where the combinational circuit is represented by COMB and clock skew is represented by t_skew.

D, QHcomb1-D2 Q2Hcomb2D3 Q3 skew1 >CK CK >CK Clock - fskew2

Given the following parameters:
FF setup time = 20 ns
FF hold time = 10 ns
FF propagation delay = 5 to 10 ns
Tcomb 1 = 5 ns to 7 ns
Tcomb 2 = 6 ns to 11 ns

(a) What is the minimum clock period with t_skew1 = t_skew2 = 0?
(b) Now set Tcomb1 = 1 to 4 ns. Is there a setup time violation for the middle flip-flop? If no, what is the setup time margin?
(c) Now set Tcomb1 = 1 to 4 ns. Is there a hold-time violation for the middle flip-flop? If no, what is the hold-time margin?
(d) What are the minimum values of t_skew1and t_skew2 that will fix the violations?
(e) What is the minimum clock period after violations have been fixed?

D, QHcomb1-D2 Q2Hcomb2D3 Q3 skew1 >CK CK >CK Clock - fskew2

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