Bump and IO strategies trade SI/PI margin against routability.
+------------------+----------------+----------------+----------------+
| Approach | Strength | Weakness | Best when |
+------------------+----------------+----------------+----------------+
| Strict | predictable | slower early | new program |
| Balanced | practical | needs rigor | stable teams |
| Aggressive | fast | escape risk | late schedule |
| Re-architect | durable | expensive | recurring failures |
+------------------+----------------+----------------+----------------+Pick the approach based on residual silicon risk, not only schedule pressure.
Policy-only arguments without artifact evidence
Unbounded waivers
INTEGRATION EVIDENCE MATRIX — Package Bring-up & Failures
+-------------------+------------------------+--------------------------+-------------------------+
| Evidence | Tells you | Does not prove | Next action |
+-------------------+------------------------+--------------------------+-------------------------+
| Manifest diff | baseline changed | root cause itself | isolate first delta |
| Domain trace | where behavior diverged| ownership accountability | map to contract owner |
| Signoff dashboard | closure posture | reproducibility quality | verify source artifacts |
| Bring-up logs | software-visible symptom| physical/timing cause | correlate with HW trace |
| Waiver register | accepted residual risk | technical closure | review expiry criteria |
+-------------------+------------------------+--------------------------+-------------------------+Package assumptions must be treated as first-class chip constraints.
PACKAGE CO-DESIGN
die io <-> package routing <-> board constraintsPACKAGE RISK MIX
SI margin █████
power integrity ████
lane mapping ███bump map revision log
SI/PI margin report
IO co-design checklist
package bring-up failures
Link degradation on product board came from package routing assumptions not reflected in pre-silicon model.
Compare package model versions
Audit lane mapping
Correlate SI/PI margins to failures
Ask: what baseline, owner, and artifact prove this topic is truly closed?
State baseline manifest and owner with every closure metric.
Run cross-domain regression after every top-level fix.
Comparing results across different manifests.
Unowned issues slipping through review cycles.
Waiving risks without expiry and validation plan.
Late package failures often stem from model mismatch, power-delivery assumptions, or lane/mapping swaps that escaped pre-silicon checks.
Metric: package-related bring-up escape count
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