UPDATING REFERENCE VOLTAGES TO COMPENSATE FOR CHANGES IN THRESHOLD VOLTAGE DISTRIBUTIONS OF NONVOLATILE MEMORY CELLS

摘要

A system including a reference voltage module configured to generate one or more reference voltages for determining states of a plurality of memory cells of a nonvolatile memory, where the plurality of memory cells have a threshold voltage distribution. A divider module divides, in response to a change in the threshold voltage distribution, a voltage range into a plurality of regions. An update module updates, to compensate for the change in the threshold voltage distribution, one of the reference voltages to a voltage value associated with one of the plurality of regions.