Ripple Counter: Glitch Duration Calculation
Asynchronous counters inherently produce intermediate, invalid states during multi-bit transitions which can trigger false clock edges in downstream logic.
An N-bit up-counting ripple counter is constructed using negative-edge triggered T flip-flops. The primary clock drives the LSB Q0, and each subsequent stage is clocked by the Q output of the preceding stage. Every flip-flop has a clock-to-Q delay of t_pcq = 5ns. A combinational logic block monitors the counter outputs to decode the all-zeros state.
Determine the duration of the worst-case transient glitch observed by the decode logic during the rollover transition from all-ones to all-zeros.
Constraints
- Assume zero propagation delay for the combinational decode logic itself.
- Interconnect routing delay between flip-flop stages is negligible.
- The counter state is represented as
Q[N-1:0], whereQ0is the LSB.
Topics
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