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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
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
A D flip-flop utilizing a PGT clock is in the CLEAR state. Which of th...
The given question is asking which input action will cause a D flip-flop utilizing a PGT (Positive-Going Transition) clock to change states when it is in the CLEAR state. Let's analyze each option one by one.

a) CLK = NGT, D = 0
- In this option, the clock signal is negative-going transition (NGT) and the input D is 0.
- Since the flip-flop is utilizing a PGT clock, it will only respond to positive-going transitions of the clock signal.
- Therefore, this input action will not cause the flip-flop to change states.

b) CLK = PGT, D = 0
- In this option, the clock signal is positive-going transition (PGT) and the input D is 0.
- Since the clock signal is a positive-going transition, it will enable the flip-flop to respond to the input D.
- When the clock signal rises, the flip-flop will sample the value of D and update its state accordingly.
- In this case, since D is 0, the flip-flop will remain in the CLEAR state.
- Therefore, this input action will not cause the flip-flop to change states.

c) CLK = NGT, D = 1
- In this option, the clock signal is negative-going transition (NGT) and the input D is 1.
- Similar to option a, since the flip-flop is utilizing a PGT clock, it will not respond to negative-going transitions of the clock signal.
- Therefore, this input action will not cause the flip-flop to change states.

d) CLK = PGT, D = 1
- In this option, the clock signal is positive-going transition (PGT) and the input D is 1.
- Since the clock signal is a positive-going transition, it will enable the flip-flop to respond to the input D.
- When the clock signal rises, the flip-flop will sample the value of D and update its state accordingly.
- In this case, since D is 1, the flip-flop will change its state from CLEAR to SET.
- Therefore, this input action will cause the flip-flop to change states.

Hence, option D is the correct answer as it is the only option that utilizes a PGT clock and results in a state change from CLEAR to SET.
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Community Answer
A D flip-flop utilizing a PGT clock is in the CLEAR state. Which of th...
PGT refers to Positive Going Transition and NGT refers to negative Going Transition. Earlier, the DFF is in a clear state (output is 0). So, if D = 1 then in the next stage output will be 1 and hence the stage will be changed.
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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 = 0b)CLK = PGT, D = 0c)CLOCK NGT, D = 1d)CLOCK PGT, D = 1Correct answer is option 'D'. Can you explain this answer?
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