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In a D flip-flop, the output Q after the clock edge is equal to ________.

  • A.the previous output
  • B.the D input just before the edge
  • C.the complement of the D input
  • D.always logic 1

Answer: A

Correct answer: the D input just before the edge

The D flip-flop simply stores whatever is on its D input at the active clock edge, holding it until the next edge. This makes it the natural building block for registers and memory cells.

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