DFF: Clock-to-Q Propagation Delay on Waveform
A positive-edge-triggered D flip-flop captures the value of D at the LOW-to-HIGH transition of CLK. The output Q does not update immediately: it has a clock-to-Q propagation delay of exactly 4 time steps.
Three signals are shown: CLK (clock), D (data input), and Q (output, initially 0).
Trace Q across all 16 time steps.
Constraints
- The output
Qmust remain stable during the propagation delay window following the clock edge. - Transitions drawn exactly at the clock edge violate the delay constraint and are incorrect.
Topics
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