MMMC Signoff

Section goal

Multi-corner multi-mode analysis, library mapping, operating conditions, signoff matrix design, and view consistency.

How to study this section

1. Start with the topic hub to learn the contract.

2. Use mechanism and reports pages to connect rules to metrics.

3. Use debug and worked-example pages for interview and on-call practice.

4. Close with checklist and PPA impact before signing any change.

Topics

1. corner-mode-matrix-design/ — Corner / Mode Matrix Design

2. library-set-and-opcond-mapping/ — Library Set & Opcond Mapping

3. signoff-vs-implementation-views/ — Signoff vs Implementation Views

4. mmmc-debug-playbook/ — MMMC Debug Playbook

Related topics

• STA course hub

STA deep dive

Signoff WNS is the minimum across the full scenario matrix.

Concept diagram

MMMC

corners (ss/tt/ff) x modes (func/test) x views (signoff RC)
= scenario set -> min(WNS) is signoff

Metric graph

WNS HEATMAP BY CORNER

        ss    tt    ff
setup  -80   +10   +5
hold   -15   -2    -8

Reports and artifacts

• per-corner WNS

• mode summary

• lib map audit

• view delta

Mini case study

Passed TT typical but failed SS hold — signoff matrix was incomplete; added low-voltage mode.

Debug branches

• Isolate failing scenario first

• Never compare unlike SPEF tags

Senior review question

Ask: what corner/mode/view proves this topic is closed or failing?