SoC Integration · All levels

Interrupt Topology Contracts: Inputs & Outputs

Inputs & Outputs for Interrupt Topology Contracts.

Inputs and outputs contract

Inputs & Outputs for Interrupt Topology Contracts focuses on interrupt latency tail, missed-interrupt incidents. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

Treat these as a signed integration contract. Ambiguity here causes multi-team debug loops where everyone is right inside their own assumptions.

diagram

INPUTS
  - baseline manifest (versions + hashes)
  - interface/budget contract revision
  - mode assumptions (functional/test/low-power)
  - owner accountability map

OUTPUTS
  - measurable closure deltas
  - owner-approved fix proposal
  - regression evidence package
  - risk/waiver disposition

Integration sequence

diagram

SOC INTEGRATION FLOW — Interrupt Topology Contracts

requirements + budgets
        |
        v
IP handoff + collateral check
        |
        v
integration build + bring-up smoke
        |
        v
cross-domain signoff evidence
        |
        v
tapeout readiness decision

Metric in focus: interrupt latency tail, missed-interrupt incidents

Ownership map

diagram

OWNERSHIP MAP — Interrupt Topology Contracts

artifact             owner
-----------------    -----------------
primary owner     firmware owner
co-owner          platform architect
review owner      RTL owner

No top-level issue should remain ownerless beyond one review cycle.

SoC deep dive

Address, interrupt, and IO contracts are where hardware/software alignment is won or lost.

Concept diagram

diagram

HW/SW CONTRACT
address map + interrupt model + io defaults -> firmware behavior

Metric graph

diagram

BOOT REGRESSION SOURCES
map churn █████
reset defaults ████
driver mismatch ███

Reports and artifacts

address decode audit
interrupt latency report
IO bring-up checklist
boot contract review

Mini case study

A map alias issue caused sporadic peripheral misconfiguration despite clean block-level tests.

Debug branches

Freeze address map baseline
Audit reset defaults
Validate firmware assumptions

Senior review question

Ask: what baseline, owner, and artifact prove this topic is truly closed?

Key takeaways

State baseline manifest and owner with every closure metric.
Run cross-domain regression after every top-level fix.

Common pitfalls

Comparing results across different manifests.
Unowned issues slipping through review cycles.
Waiving risks without expiry and validation plan.

Principal SoC review addendum

Interrupt architecture defines aggregation, priority, routing, and affinity policies that software relies on for deterministic response.

Metric: interrupt latency tail, missed-interrupt incidents

Practice this lesson