Wires that run side by side talk to each other. This section covers both consequences: delta delay, when a neighbour changes how fast a net switches, and noise, when it makes a quiet net twitch. It then turns to the practical side: which fixes to try in which order, how to check that a fix worked, and how to read and sign off a crosstalk report. All numbers are small, consistent and illustrative.
Lesson | After it you can... |
|---|---|
Compute effective capacitance. | |
Find the aggressors that can overlap. | |
Add deltas along a path. | |
Assign the right direction to each check. | |
Estimate a glitch peak. | |
Compare a glitch with a tolerance curve. | |
Prioritise by receiver. | |
Gate signoff on a noise summary. | |
Rank fixes by benefit per cost. | |
Estimate their gain and price. | |
Compare the two ends of a pair. | |
Catch regressions. | |
Check a victim block. | |
Measure what thresholds hide. | |
Argue exclusivity with evidence. | |
Decide readiness. |
Suggested order: top to bottom. Previous sections: OCV, AOCV, POCV and Variation, Multi-Corner Multi-Mode Signoff and Delay Graph and Path Analysis.
Delta delay on switching nets (slower or faster transitions) and noise glitches on quiet nets.