VLSI Question:
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In what cases do you need to double clock a signal before presenting it to a synchronous state machine?

Answer:

if the input signal is asynchronous with the clock (state
machine clock), then you need to double clock the same
signal to synchronize with the state machine clock.

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Describe a finite state machine that will detect three consecutive coin tosses (of one coin) that results in heads?You have a driver that drives a long signal & connects to an input device. At the input device there is either overshoot, undershoot or signal threshold violations, what can be done to correct this problem?