Read threshold determination using reference read threshold

摘要

A non-transitory computer readable medium that stores instructions for: reading a first group of flash memory cells using a reference read threshold to obtain multiple read results; processing the multiple read results by performing at least one out of calculating a distribution of values of the multiple read results and counting a number of read results of a certain value; estimating at least one actual read threshold to be used during future read attempts in response to at least one out of (i) the number of read results of the certain value and (ii) distribution information about a distribution of values of the read results; and reading a second group of flash memory cells using the at least one actual read threshold to provide actual read results.

主权项

1. A non-transitory computer readable medium that stores instructions for:
calculating a reference read threshold in response to information about read threshold voltages of a plurality of flash memory cells and about logical values stored by the plurality of flash memory cells; reading a first group of flash memory cells using the reference read threshold to obtain multiple read results; processing the multiple read results by performing at least one out of calculating a distribution of values of the multiple read results and counting a number of read results of a certain value; estimating at least one actual read threshold to be used during future read attempts in response to at least one out of (i) the number of read results of the certain value and (ii) distribution information about a distribution of values of the read results; and reading a second group of flash memory cells using the at least one actual read threshold to provide actual read results.