Power / PD Handoff translates low-power intent into release-grade evidence. Clear contracts between UPF intent owners and PD implementation teams prevent last-minute ECO churn and ownership ambiguity. The practical challenge is proving policy correctness under real transitions and ensuring each owner closes their layer without semantic drift.
When handoff defect rate, ECO churn after handoff, and ownership clarity score regresses, can you identify the failing transition, policy owner, implementation evidence, and minimum regression that proves closure?
POWER INTENT FLOW — Power / PD Handoff
architecture intent
|
v
UPF objects (domain/supply/state/strategy)
|
v
RTL + synthesis + PD interpretation
|
v
verification + signoff evidence
|
v
release decision
Primary metric: handoff defect rate, ECO churn after handoff, and ownership clarity scoreStart with domain/state diagrams before diving into logs. These are the models to sketch in design and interview reviews.
HANDOFF CONTRACT
intent owner provides:
- UPF baseline + controls + PST
PD owner provides:
- implementation reports + IR evidence
both sign:
- mismatch closure + waiver policyPOWER DOMAIN MAP — Power / PD Handoff
+------------------- always_on -------------------+
| PMU / control / retention rail |
+---------+----------------------------+----------+
| |
+--------v---------+ +--------v---------+
| domain_A | | domain_B |
| switchable |<------->| switchable |
| iso/ret controls | crossings require policy |
+------------------+ +------------------+
Domain boundaries are policy boundaries, not drawing boundaries.STATE TRANSITIONS — Power / PD Handoff
ON --save--> RETENTION --off--> OFF
^ | |
| +----restore<--------+
+--------------------power_up--------+
Guard checks:
- isolation asserted before OFF
- restore before functional traffic
- reset policy consistent with retained stateLP OWNERSHIP LAYERS — Power / PD Handoff
layer owns typical failure
------------------ --------------------------- --------------------------
architecture domain strategy infeasible power states
UPF intent policy objects + bindings wrong/missing policy
implementation LP cell insertion/routing illegal physical behavior
verification transition scenarios uncovered LP bug
signoff governance waiver + release decisions late escape to siliconPrimary metric: handoff defect rate, ECO churn after handoff, and ownership clarity score.
Primary artifact: handoff manifest, owner matrix, and post-handoff ECO log.
Owners to bring into review: PD lead, UPF lead, program manager.
One failing transition timeline with state markers and control signals.
One report snippet proving policy intent versus implementation behavior.
OWNERSHIP MAP — Power / PD Handoff
artifact owner
---------------- -----------------
intent policy PD lead
implementation UPF lead
verification program manager
Escapes happen when ownership is implicit.Each topic is taught across mechanism, inputs/outputs, reports, debug, worked example, pitfalls, interview, checklist, theory, design space, expanded case study, walkthrough, comparison matrix, software view, and silicon impact.
Always name the transition context for every low-power metric.
Bind each policy decision to a specific owner and artifact.
Re-run LP simulation, formal, and implementation checks after changes.
Treating static pass reports as transition closure.
Fixing symptoms without checking policy binding and sequence order.
Shipping with ambiguous ownership on open LP violations.
Mode transition IR and ownership clarity determine tapeout confidence.
GRID + TRANSITIONS
domain partition -> staged wake -> transient IR -> signoff gateTRANSIENT DROOP TREND
baseline ███████
after staging ████
after tuning ██domain grid report
dynamic IR analysis
LP signoff dashboard
handoff owner matrix
Dynamic IR during wake-up, not static IR, was the true blocker for release.
Inspect transition waveforms
Check PMU schedule alignment
Escalate aged waivers
Ask: what transition evidence proves this topic is closed, and which owner signs it?
State transition context must accompany every low-power metric claim.
Intent changes require simulation, formal, and implementation re-validation.
Comparing results from mismatched UPF revisions.
Assuming static checks replace transition validation.
Shipping with aged waivers and unclear ownership.
Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 1
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 2
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 3
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 4
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 5
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 6
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>Use this pack to rehearse low-power closure on low-power/pd-power-integration/power-pd-handoff: transition framing, policy ownership, implementation evidence, and release confidence.
State transition explicitly named with legal source/target states.
Crossing and domain ownership are mapped and agreed.
Policy controls are traced to always-on source logic.
Waveform bookmarks align controls with state timestamps.
Which policy object is first to deviate from intent?
Which owner can apply the smallest reversible fix?
What regression matrix proves no collateral damage?
Which waiver conditions would still block release?
LP EVIDENCE CAPSULE 7
PATH: low-power/pd-power-integration/power-pd-handoff
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>