Non-volatile memory controller with error correction (ECC) tuning via error statistics collection

摘要

A non-volatile memory controller for a solid state drive includes a soft-decision LDPC decoder. The soft-decision LDPC decoder includes a probability generation module. A processor reads collected statistics collated from decoded frames and tunes the performance of the soft-decision LDPC decoder performance. Additional parameters may also be taken into account, such as the scramble seed and the type of non-volatile memory. An asymmetry in errors may also be detected and provided to a hard-decision LDPC decoder to adjust its performance.

主权项

1. A method of decoding non-volatile memory pages of a non-volatile memory, comprising:
collating error statistics in a decoded output of a soft-decision Low Density Parity Check (LDPC) decoder utilizing a probability to decode the non-volatile memory pages, the probability based on a set of soft-decision read values; and updating, based on the error statistics, a probability lookup table (LUT) used to determine, from the set of soft-decision read values, the probability of a bit in the non-volatile memory page having a particular binary value.