DFT / ATPG · All levels

DFT / ATPG Cheatsheet

Dense reference for DFT release, debug, and interview answers.

Debug order

diagram

METRIC -> MECHANISM -> EVIDENCE -> OWNER -> FIX -> REGRESSION

Scan: insertion legality, chain balance, clocking
Compression: ratio, X-handling, diagnosis resolution
ATPG: fault model, constraints, pattern quality
BIST/JTAG: reachability, compliance, security
Signoff: test timing + test power + quality + release checklist

Questions before release

What metric is still at risk and in what context?
Which assumption is weakest (model, constraints, physical, tester)?
Which artifact proves confidence?
Who owns unresolved risk?
What regression matrix was run and passed?

Practice this lesson