Low Power Verification · All levels

Isolation & Level Shifting

Verification of isolation and level-shifter intent across power domains, including clamp strategy correctness, signal-direction safety, placement legality, and redundant-or-missing protection analysis.

Section goal

How to study this section

Start with each topic hub and restate boundary mechanism in your own words.
Use reports and debug pages to classify first failing low-power phase.
Practice worked examples and interview drills under fixed metadata.
Close with checklist and execution impact before signoff claims.

Topics

isolation-strategy-verification/ - Isolation Strategy and Clamp Value Verification
level-shifter-checks/ - Level-Shifter Direction, Threshold, and Enable Checks
iso-ls-placement-bugs/ - Isolation + Level-Shifter Placement Bugs at Domain Crossings
redundant-or-missing-isolation/ - Detecting Redundant or Missing Isolation

Low-power verification deep dive

Boundary correctness depends on timing: isolate and shift at the right crossings and right phases.

Concept diagram

diagram

BOUNDARY SAFETY VIEW

domain crossing -> level-shift requirement -> isolation control -> OFF/ON transition behavior

Metric graph

diagram

BOUNDARY BUG CLASSES

missing isolation      █████
late isolation         ████
LS misdirection        ███

Metrics and artifacts to collect

cross-domain boundary inventory
clamp-value correctness report
LS direction and threshold checks
missing or redundant boundary action list

Mini case study

A boundary bug escaped unit tests until domain-off traffic stress revealed late isolation enable timing.

Debug branches

Map each crossing to expected LS and isolation behavior.
Verify enable timing against collapse and restore edges.
Check clamp safety for protocol-facing signals.

Senior review question

Ask: what exact low-power transition boundary failed first, and which artifact proves the closure claim reproducibly?

Practice this lesson

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