公开(公告)号：US09928126B1

公开(公告)日：2018-03-27

申请号：US15716684

申请日：2017-09-27

Applicant: Apple Inc.

Inventor： Assaf Shappir ,  Moshe Neerman ,  Ofer Shapira

IPC: G06F11/00 ,  G11C7/04 ,  G06F11/30

CPC classification number: G06F11/002 ,  G06F11/3058 ,  G11C7/04 ,  G11C11/5642

Abstract: A memory system includes an interface and storage circuitry. The interface is configured to communicate with memory cells that store data. The storage circuitry is configured to program a data unit to a first group of the memory cells, to read the data unit from the first group using at least a read threshold to produce a first readout, and in response to detecting that reading the data unit has failed because the read threshold has fallen outside a supported range of read thresholds, due to a temperature difference between a time of programming the first group and a time of reading the first group, to program a second group of the memory cells. The circuitry is further configured to re-read the data unit from the first group using the at least read threshold to produce a second readout, and to recover the data unit from the second readout.