Chip-Package I/O Co-design: Reports & Metrics

Reports and metrics

Reports & Metrics for Chip-Package I/O Co-design focuses on I/O timing closure against package constraints. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

The job of a report is to convert I/O timing closure against package constraints into a closure decision. One summary number is never enough without baseline, owner, and boundary context.

Metric movement

METRIC GRAPH — I/O timing closure against package constraints

integration confidence
  ^
  |                         target
  |                       - - - - - - -
  |                  o post-fix + regression
  |              o
  |         o baseline
  |    o failing run
  +--------------------------------------> closure iteration
    baseline freeze   owner fix   full matrix

Readout:
  - compare results on the same manifest baseline
  - state owner and boundary with every metric movement

Risk distribution

RISK HISTOGRAM — Chip-Package I/O Co-design

issue count
  |      ***
  |    *******
  |  ***********
  |*************  <- critical tail
  +--------------------> risk severity
   low   medium   high

Debug the high-severity tail first; averages hide escape risk.

• Track I/O timing closure against package constraints by domain and owner boundary.

• Store baseline manifest beside every metric snapshot.

• Report both immediate fix result and full regression result.

• Explicitly call out residual risk and ownership.

SoC deep dive

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

Concept diagram

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

Metric graph

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.

Reading integration reports