Error recovery using erasures for NAND flash

摘要

Data is processed by selecting one or more bits in a codeword to replace with an erasure. The selected bits in the codeword are replaced with the erasure and error correction decoding is performed on the codeword with the erasure in place for the selected bits.

主权项

1. A system for processing data, comprising:
a processor; and a memory coupled with the processor, wherein the memory is configured to provide the processor with instructions which when executed cause the processor to:
select one or more bits in a codeword to replace with an erasure, including by:
selecting the one or more bits in the codeword based at least in part on aplurality of accumulated values corresponding to a plurality of bit lines; and
generating the plurality of accumulated values, including by accumulating, for a bit line being analyzed, a magnitude of a difference between a soft value after error correction decoding and a soft value before error correction decoding;replace the selected bits in the codeword with the erasure; andperform error correction decoding on the codeword with the erasure in place for the selected bits.