Digital Electronics - Flip-Flops - Discussion


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

Answer: Option D


No answer description available for this question.

Muskaan said: (Dec 5, 2012)  
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.

Khush said: (Dec 22, 2014)  
But D can be 1 in NGT. How you determined whether it should be option D only.

Sameena said: (Feb 8, 2015)  
It says in the question, that flip flop is using a PGT clock.

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