(a) A Mealy sequential circuit has one input (x) and
Chapter 14, Problem 14.20(choose chapter or problem)
(a) A Mealy sequential circuit has one input (x) and one output (z). \(z=1\) if and only if the most recent input combined with the preceding three inputs was not a valid excess-3 encoding of a decimal digit; otherwise, \(z=0\). Assume the excess-3 digits are received least significant bit first. Derive a state table for the circuit. Assume that in the reset state all previous inputs were \(0\). (Six states are sufficient.)
(b) Repeat for a Moore circuit (i.e., \(z=1\) if and only if the previous four inputs were not a valid excess-3 digit). (Eight states are sufficient.)
(c) Is it possible for a Moore circuit to generate the correct output while the fourth input bit is present rather than after it has been received? Explain your answer.
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