Abstract
The over-erase algorithm (OEA) is the state-of-the-art procedure exploited in nor Flash architectures to increase the memory reliability against the over-erase phenomenon mainly caused by either fast or erratic bits. In FN/FN architectures, since the soft-programming operation involved in the algorithm uses the same physical mechanism of the erase operation, its execution potentially triggers additional failures. In this paper, a detailed characterization of the soft-programming failures is provided by categorizing their statistical occurrence in order to capture their relationship with the failures exposed after the execution of the algorithm. A model of the failure rate is then derived to provide a rough guideline for OEA optimization in terms of performance and reliability.
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