For a state machine, suppose the propagation and contamination delays of the next state circuit are 20nsecs and 5nsec, respectively. For the registers to store the current state, the propagation delay, set-up time, and hold time are 4 nsec, 2nsec, 2nsec, respectively.
a) What is the minimum clock period required for this state machine?
b) Whne can the external inputs be changed after a rising clock edge for proper operation?
c) For how long should the external inputs be held stable for proper operation? (Consider total time needed before and after a rising edge.)