A method and apparatus to compact test responses containing unknown values or multiple fault effects in a deterministic test environment. The proposed selective compactor employs a linear compactor with selection circuitry for selectively passing test responses to the compactor. In one embodiment, gating...http://www.google.co.uk/patents/US8108743?utm_source=gb-gplus-sharePatent US8108743 - Method and apparatus for selectively compacting test responses