Clocking: jitter budget, lock stability, uncertainty delta.
SerDes: BER, training pass rate, lane margin, retry count.
Converters: sample validity, calibration residual, saturation/overflow behavior.
Physical/signoff: keepout violations, substrate coupling, IR droop at islands, waiver count.
Program: blocker burn-down, closure confidence, owner signoff completeness.
METRIC GRAPH — jitter / BER / validity / signoff blockers
health / margin
^
| target
| - - - - - - -
| o post-fix
| o
| o baseline
| o failing run
+--------------------------------------> debug iteration
repro setup root-cause proof release candidate
Readout:
- compare only equivalent mode, payload, clock, and environment tags
- separate symptom stabilization from true mechanism closure