Whiteboard answer shape

1. Name the protocol layer.
2. Name the transaction identity.
3. State the ordering or flow-control rule.
4. Ask for waveform + transaction log + spec clause.
5. Propose the smallest experiment.
6. State the regression suite.

Scenarios

1. scenario-axi-ordering-trap/ — Scenario: AXI Ordering Trap

2. scenario-ddr-bandwidth-collapse/ — Scenario: DDR Bandwidth Collapse

3. scenario-pcie-link-degrade/ — Scenario: PCIe Link Degrade

Protocol deep dive

Protocol correctness is a layered contract enforced at every boundary.

Concept diagram

intent -> transaction -> channel -> physical

Metric graph

baseline -> experiment -> target

Metrics and artifacts to collect

• latency

• throughput

• error rate

• compliance status

Mini case study

Always anchor debug to the first bad transaction.

Debug branches

• Name layer

• Name ID

• Name artifact

Senior review question

Ask: what is the first transaction that deviates, and which spec rule does it test?