Patent ID: 7007214
Filing Date: 2006-02-28
Classification: G01R

Abstract:
1. A circuit for identifying a defect location in a set of latches, said circuit comprising: a first set of latches wired on a first wiring level; a second set of latches wired on a second wiring level, each latch in the second set of latches being coupled with a corresponding latch in the first set of latches; a controller that selectively parallel shifts the contents of the first set of latches into the second set of latches via a parallel shifting means; a detector, coupled to an output of the second set of latches, that compares an output of the second set of latches with a predetermined bit sequence to identify a location of a defect in a defective set of latches, the defective set of latches being either the first or second set of latches, said detector further identifying whether a wiring of the defective set of latches is on the first wiring level or the second wiring level.