Clock-to-Q Delay
A positive-edge-triggered D flip-flop with a non-ideal clock-to-Q delay updates its output $t_{pcq}$ time steps after the rising edge of the clock.
Three signals are evaluated: CLK (clock), D (input) and Q (output). The delay $t_{pcq}$ is exactly 4 time steps and Q is initially 0.
Trace the value of Q across all 16 time steps.
Constraints
- The output
Qmust transition exactly 4 time steps after the positive clock edge. - The value captured from
Dis evaluated exactly at the rising edge ofCLK. - Changing
Qsynchronously at the clock edge produces incorrect hold time analysis for downstream logic and is considered incorrect.
Topics
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