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Codiode/Problems/Sequential Logic

Propagation Delay Asymmetry: Rising vs. Falling Output

MediumLogic CircuitTiming Diagram

A positive-edge-triggered D flip-flop updates its output Q on the rising edge of CLK with a high-transition delay (t_pcqH) of 3 time units and a low-transition delay (t_pcqL) of 5 time units.

Three signals are shown: CLK (clock, period 2), D (input data), and Q (output, initially 0).

Trace Q across all 16 time steps.

Constraints

  • Output Q only changes after a rising edge of CLK.
  • A 0-to-1 transition on Q takes exactly 3 time steps to appear after the clock edge.
  • A 1-to-0 transition on Q takes exactly 5 time steps to appear after the clock edge.
  • The value captured is strictly the value of D at the exact moment of the CLK rising edge.

Topics

timing-analysisflip-flopspropagation-delay

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