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Official PYQ · 2023

GATE CS 2023 Q33 — Sequential Circuits

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Consider a sequential digital circuit consisting of T\mathrm{T} flip-flops and D\mathrm{D} flip-flops as shown in the figure. CLKIN\text{CLKIN} is the clock input to the circuit. At the beginning, Q1, Q2\text{Q1, Q2} and Q3\text{Q3} have values 0,10,1 and 1,1, respectively.

Which one of the given values of (Q1, Q2, Q3)\text{(Q1, Q2, Q3)} can NEVER\text{NEVER} be obtained with this digital circuit?

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Answer: A

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