CPF vs UPF translates low-power intent into release-grade evidence. CPF and UPF express similar low-power intent with different constructs; migration quality depends on preserving domain policy semantics, not syntax. The practical challenge is proving policy correctness under real transitions and ensuring each owner closes their layer without semantic drift.
When intent migration completeness, semantic mismatch count, and review waivers regresses, can you identify the failing transition, policy owner, implementation evidence, and minimum regression that proves closure?
POWER INTENT FLOW — CPF vs UPF
architecture intent
|
v
UPF objects (domain/supply/state/strategy)
|
v
RTL + synthesis + PD interpretation
|
v
verification + signoff evidence
|
v
release decision
Primary metric: intent migration completeness, semantic mismatch count, and review waiversStart with domain/state diagrams before diving into logs. These are the models to sketch in design and interview reviews.
MIGRATION CHECK
CPF construct -> UPF construct -> semantic parity?
domain defs -> create_power_domain
isolation -> set_isolation
retention -> set_retention
Syntax conversion is easy; behavior parity is the real work.POWER DOMAIN MAP — CPF vs UPF
+------------------- 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 — CPF vs UPF
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 — CPF vs UPF
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: intent migration completeness, semantic mismatch count, and review waivers.
Primary artifact: migration checklist, side-by-side intent diff, and signoff waiver log.
Owners to bring into review: low-power lead, CAD owner, methodology owner.
One failing transition timeline with state markers and control signals.
One report snippet proving policy intent versus implementation behavior.
OWNERSHIP MAP — CPF vs UPF
artifact owner
---------------- -----------------
intent policy low-power lead
implementation CAD owner
verification methodology owner
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.
Power intent must be explicit, reviewable, and tool-consistent from day one.
POWER INTENT FLOW
architecture -> UPF objects -> tool binding -> verification evidenceINTENT QUALITY
bound policies ████████████ high
stale references ███ medium risk
missing states ██ high riskPST report
domain map
UPF lint
policy binding summary
One missing PST entry blocked legal retention mode and caused false debug loops.
Check legal state table first
Audit policy binding IDs
Freeze UPF revision tags
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
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/power-intent-fundamentals/cpf-vs-upf: 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/power-intent-fundamentals/cpf-vs-upf
STATE WINDOW: <from -> to>
POLICY OBJECT: <isolation / retention / shifter / switch>
OWNER: <name>
PRIMARY ARTIFACT: <report/waveform/formal result>
RELEASE DECISION: <close / bounded waiver / escalate>