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Flip-Flops

Q1: A D flip-flop utilizing a PGT clock is in the CLEAR state. Which of the following input actions will cause it to change states?

A
CLK = NGT, D = 0

B
CLK = PGT, D = 0

C
CLOCK NGT, D = 1

D
CLOCK PGT, D = 1

E
CLK = NGT, D = 0, CLOCK NGT, D = 1

ANS:D -

CLOCK PGT, D = 1

PGT is Positive Going Transition
And NGT is negative Going Transition.

Earlier DFF is in clear state (output is 0)
So if D = 1 then in next stage output will be 1
And hence the stage will be changed.



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