means adding extra circuitry to make internal nodes controllable and observable, drastically reducing test cost and time.
Self-contained, works at-speed. Disadvantages: Area overhead, fault coverage may be < 100% (add deterministic patterns). digital systems testing and testable design solution
BIST involves placing the tester directly on the chip. It uses internal logic—typically a Pseudo-Random Pattern Generator (PRPG)—to create test vectors and a Signature Analyzer to verify the output. BIST is essential for high-speed memory (MBIST) and mission-critical systems (like automotive or medical electronics) that need to perform self-diagnostics in the field. means adding extra circuitry to make internal nodes