Low Power Verification · All levels

Retention & Restore

How to verify retention intent, save/restore sequencing, corruption root causes, and subtle state-loss escapes across power-down and wake-up transitions.

Section goal

How to verify retention intent, save/restore sequencing, corruption root causes, and subtle state-loss escapes across power-down and wake-up transitions.

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

retention-register-verification/ - Retention Registers and Cell-Level Verification
save-restore-sequences/ - Save/Restore Handshake Sequencing
retention-corruption-debug/ - Debugging Retention Corruption
state-loss-scenarios/ - Detecting Unintended State Loss Scenarios

Low-power verification deep dive

Retention closure requires proving end-to-end state lifecycle through save, off, and restore windows.

Concept diagram

diagram

RETENTION LIFECYCLE

save request -> state capture -> power off -> power on -> restore -> traffic resume

Metric graph

diagram

RETENTION STABILITY

restore mismatch       █████
save timing defects    ████
stable wake cycles     ███████

Metrics and artifacts to collect

retention save/restore timing report
pre/post state diff matrix
multi-cycle retention stress summary
state-loss bug trend by mode

Mini case study

A corruption issue persisted until retention checks compared multi-cycle state snapshots rather than single wake events.

Debug branches

Track save acknowledgement against actual state capture.
Validate restore completion before functional traffic resumes.
Run repeated sleep/wake cycles to expose drift.

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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