SoC Integration · All levels

Package SI/PI Contracts: Inputs & Outputs

Inputs & Outputs for Package SI/PI Contracts.

Inputs and outputs contract

Inputs & Outputs for Package SI/PI Contracts focuses on SI/PI margin violations, package-driven timing regressions. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

Treat these as a signed integration contract. Ambiguity here causes multi-team debug loops where everyone is right inside their own assumptions.

diagram

INPUTS
  - baseline manifest (versions + hashes)
  - interface/budget contract revision
  - mode assumptions (functional/test/low-power)
  - owner accountability map

OUTPUTS
  - measurable closure deltas
  - owner-approved fix proposal
  - regression evidence package
  - risk/waiver disposition

Integration sequence

diagram

SOC INTEGRATION FLOW — Package SI/PI Contracts

requirements + budgets
        |
        v
IP handoff + collateral check
        |
        v
integration build + bring-up smoke
        |
        v
cross-domain signoff evidence
        |
        v
tapeout readiness decision

Metric in focus: SI/PI margin violations, package-driven timing regressions

Ownership map

diagram

OWNERSHIP MAP — Package SI/PI Contracts

artifact             owner
-----------------    -----------------
primary owner     SI/PI owner
co-owner          package architect
review owner      signoff owner

No top-level issue should remain ownerless beyond one review cycle.

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

Package SI/PI constraints define return paths, impedance, and noise budgets that must be reflected in chip-level assumptions.

Metric: SI/PI margin violations, package-driven timing regressions

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