II. EXPERIMENTS
During product qualification and yield improvement stages, devices
were reported with memory failures. Two failing units were used for
analysis. Bitmapping helped to narrow the failing locations down to the
failing bits of interest on each unit. Both these units came from different
phases of the product life cycle ± one from the initial product
qualification phase and the other from the yield improvement phase.
With the bit locations obtained from bitmapping, PFA using parallel