Reports and metrics

Reports & Metrics for Clock/Reset + DFT Interactions focuses on scan mode timing escapes, test-mode bring-up issues. The goal is to map symptoms to boundary contracts, owner actions, and regression-proof closure.

The job of a report is to convert scan mode timing escapes, test-mode bring-up issues into a closure decision. One summary number is never enough without baseline, owner, and boundary context.

Metric movement

METRIC GRAPH — scan mode timing escapes, test-mode bring-up issues

integration confidence
  ^
  |                         target
  |                       - - - - - - -
  |                  o post-fix + regression
  |              o
  |         o baseline
  |    o failing run
  +--------------------------------------> closure iteration
    baseline freeze   owner fix   full matrix

Readout:
  - compare results on the same manifest baseline
  - state owner and boundary with every metric movement

Risk distribution

RISK HISTOGRAM — Clock/Reset + DFT Interactions

issue count
  |      ***
  |    *******
  |  ***********
  |*************  <- critical tail
  +--------------------> risk severity
   low   medium   high

Debug the high-severity tail first; averages hide escape risk.

• Track scan mode timing escapes, test-mode bring-up issues by domain and owner boundary.

• Store baseline manifest beside every metric snapshot.

• Report both immediate fix result and full regression result.

• Explicitly call out residual risk and ownership.

SoC deep dive

Clock/reset assumptions must be globally consistent across functional and test modes.

Concept diagram

CLOCK/RESET FLOW
pll lock -> clock enable -> reset release -> domain ready

Metric graph

BOOT STABILITY
stable boots ████████
reset hangs  ███

Reports and artifacts

• clock architecture report

• reset release timing

• mode matrix

• boot trace summary

Mini case study

Intermittent boot hang traced to one domain releasing reset before dependent clock was stable.

Debug branches

• Check mode-specific constraints

• Trace reset dependencies

• Correlate firmware sequencing

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.

Reading integration reports