DenseChip

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Chip-Package I/O Co-design: Step-by-Step Walkthrough

Step-by-Step Walkthrough for Chip-Package I/O Co-design.

Step-by-step analysis walkthrough

Use when you own Chip-Package I/O Co-design in a top-level integration review.

  1. Open latest integration baseline and manifest.

  2. Inspect failing metric by domain.

  3. Trace first failing contract boundary.

  4. Collect artifacts and assign single-thread owner.

  5. Define minimal proof experiment.

  6. Apply smallest reversible fix.

  7. Run focused check then full regression.

  8. Update dashboard and governance log.

  9. Decide: close, waive with expiry, or escalate.

  10. Publish final review memo.

Artifacts to collect

  • I/O co-design matrix, pad-ring checklist, board interface spec

  • baseline manifest

  • owner matrix

  • regression summary

  • risk memo

Decision memo template

diagram
SOC DECISION MEMO — Chip-Package I/O Co-design
baseline:
metric:
root cause:
fix:
residual risk:
owners: I/O architect, package lead, board owner

Reference visuals

Chip-package-IO co-design loop

diagram
CO-DESIGN LOOP

pad-ring assumptions <-> package routing <-> board constraints
                  |
             iterate until all three agree

SoC deep dive

Package assumptions must be treated as first-class chip constraints.

Concept diagram

diagram
PACKAGE CO-DESIGN
die io <-> package routing <-> board constraints

Metric graph

diagram
PACKAGE RISK MIX
SI margin █████
power integrity ████
lane mapping ███

Reports and artifacts

  • bump map revision log

  • SI/PI margin report

  • IO co-design checklist

  • package bring-up failures

Mini case study

Link degradation on product board came from package routing assumptions not reflected in pre-silicon model.

Debug branches

  • Compare package model versions

  • Audit lane mapping

  • Correlate SI/PI margins to failures

Senior review question

Ask: what baseline, owner, and artifact prove this topic is truly closed?

Key takeaways

  • State baseline manifest and owner with every closure metric.

  • Run cross-domain regression after every top-level fix.

Common pitfalls

  • Comparing results across different manifests.

  • Unowned issues slipping through review cycles.

  • Waiving risks without expiry and validation plan.

Principal SoC review addendum

I/O co-design aligns pad-ring, bump assignment, voltage domains, ESD, and board routing expectations as a single contract.

Metric: I/O timing closure against package constraints

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