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A sequential circuit using D flip-flop and logic gates is shown in the figure, where X and Y are inputs and Z is the output. The circuit is

A sequential circuit using D flip-flop and logic gates is shown in the figure, where X and Y are inputs and Z is the output. The circuit is Correct Answer J – K flip-flop with X = K and Y = J

The input to the D-flip-flop in the circuit is D = X̅ Z + Y Z̅      ______ 1)

When converting D-flip-flop to J K flip-flop we have D = J Q̅ + K̅ Q      ______2)

Comparing 2) and 1) we have

Output Z = Q then

J = Y and K = X

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