Propagation Delay Asymmetry: Rising vs. Falling Output
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
Qonly changes after a rising edge ofCLK. - A 0-to-1 transition on
Qtakes exactly 3 time steps to appear after the clock edge. - A 1-to-0 transition on
Qtakes exactly 5 time steps to appear after the clock edge. - The value captured is strictly the value of
Dat the exact moment of theCLKrising edge.
Topics
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