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Course contents

  • How to Use This Course
  • Low-Power Metrics Reference
  • Low-Power Glossary
  • Reading Path
  • Power Intent Fundamentals61
    • Supply Sets & Power States
    • Power Domain Basics
    • UPF Object Model
      • UPF Object Model: Mechanism
      • UPF Object Model: Inputs & Outputs
      • UPF Object Model: Reports & Metrics
      • UPF Object Model: Debug Playbook
      • UPF Object Model: Worked Example
      • UPF Object Model: Pitfalls & Red Flags
      • UPF Object Model: Interview Drills
      • UPF Object Model: Review Checklist
      • UPF Object Model: Theory Deep Dive
      • UPF Object Model: Design Space
      • UPF Object Model: Expanded Case Study
      • UPF Object Model: Step-by-Step Walkthrough
      • UPF Object Model: Comparison Matrix
      • UPF Object Model: Software / Programmer View
      • UPF Object Model: Silicon PPA Impact
    • CPF vs UPF
    • Power Intent Fundamentals: Tricky Q&A
  • Isolation & Retention61
  • Level Shifters & Power Switches61
  • UPF Implementation Flow61
  • Low Power Verification61
  • PD & Power Grid Integration61
  • Low Power Interview Prep4
  • Low Power / UPF Cheatsheet
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‹UPF Object Model
  1. Topics
  2. Low-Power Design
  3. Power Intent Fundamentals
  4. UPF Object Model
  5. UPF Object Model: Interview Drills

Low Power / UPF · All levels

UPF Object Model: Interview Drills

Interview Drills for UPF Object Model.

On this page

    Interview drills

    Interview Drills for UPF Object Model focuses on UPF lint violations, unresolved object references, and policy binding success. The goal is to link observed behavior to power-intent mechanism, ownership, and release risk.

    Diagram
    PROMPT
    You see UPF lint violations, unresolved object references, and policy binding success on UPF Object Model. Walk through root cause and release decision.
    
    STRONG ANSWER
    1. Names failing state transition and domains.
    2. Explains UPF objects (domains, supply nets, sets, strategies, controls) form a graph that tools resolve from RTL through implementation.
    3. Requests UPF lint log, object resolution report, and policy summary.
    4. Proposes bounded fix and regression matrix.
    
    WEAK ANSWER
    Jumps to generic UPF edits without transition timeline, ownership, or signoff evidence.

    Diagram to draw on whiteboard

    UPF object graph

    Diagram
    UPF OBJECT GRAPH
    
    create_power_domain
        -> create_supply_net / create_supply_set
        -> create_pst (power states)
        -> set_isolation / set_retention / set_level_shifter
        -> map controls (PMU signals)
    
    Broken references become silent intent drift.

    Root-cause tree to narrate

    Diagram
    ROOT-CAUSE TREE — UPF Object Model
    
    UPF lint violations, unresolved object references, and policy binding success regressed
            |
       reproducible in same sequence?
         /                \
       no                  yes
       |                    |
    stimulus drift      intent mismatch or
    testbench issue     implementation bug
     /      \              |
    power    checker     crossing/strategy audit
    state    model       + waveform timeline

    Low-power deep dive

    Power intent must be explicit, reviewable, and tool-consistent from day one.

    Concept diagram

    Diagram
    POWER INTENT FLOW
    
    architecture -> UPF objects -> tool binding -> verification evidence

    Metric graph

    Diagram
    INTENT QUALITY
    
    bound policies      ████████████ high
    stale references    ███          medium risk
    missing states      ██           high risk

    Reports and artifacts

    • PST report

    • domain map

    • UPF lint

    • policy binding summary

    Mini case study

    One missing PST entry blocked legal retention mode and caused false debug loops.

    Debug branches

    • Check legal state table first

    • Audit policy binding IDs

    • Freeze UPF revision tags

    Senior review question

    Ask: what transition evidence proves this topic is closed, and which owner signs it?

    Key takeaways

    • State transition context must accompany every low-power metric claim.

    • Intent changes require simulation, formal, and implementation re-validation.

    Common pitfalls

    • Comparing results from mismatched UPF revisions.

    • Assuming static checks replace transition validation.

    • Shipping with aged waivers and unclear ownership.

    Execution drill pack 1

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 1
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 2

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 2
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 3

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 3
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 4

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 4
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 5

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 5
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 6

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 6
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 7

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 7
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 8

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 8
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 9

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 9
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 10

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 10
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 11

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 11
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 12

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 12
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Execution drill pack 13

    Use this pack to rehearse low-power closure on low-power/power-intent-fundamentals/upf-object-model/interview: transition framing, policy ownership, implementation evidence, and release confidence.

    Transition checklist

    • 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.

    Review prompts

    1. Which policy object is first to deviate from intent?

    2. Which owner can apply the smallest reversible fix?

    3. What regression matrix proves no collateral damage?

    4. Which waiver conditions would still block release?

    Evidence capsule

    Diagram
    LP EVIDENCE CAPSULE 13
    
    PATH: low-power/power-intent-fundamentals/upf-object-model/interview
    STATE WINDOW: <from -> to>
    POLICY OBJECT: <isolation / retention / shifter / switch>
    OWNER: <name>
    PRIMARY ARTIFACT: <report/waveform/formal result>
    RELEASE DECISION: <close / bounded waiver / escalate>

    Principal LP review addendum

    UPF objects (domains, supply nets, sets, strategies, controls) form a graph that tools resolve from RTL through implementation.

    Metric: UPF lint violations, unresolved object references, and policy binding success

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    See also

    • UPF Object Model: Mechanism
    • UPF Object Model: Inputs & Outputs
    • UPF Object Model: Reports & Metrics