Invention Grant
US09159407B2 Soft readout from analog memory cells in the presence of read threshold errors
有权
在存在读取阈值错误的情况下,从模拟存储器单元中软读出
- Patent Title: Soft readout from analog memory cells in the presence of read threshold errors
- Patent Title (中): 在存在读取阈值错误的情况下,从模拟存储器单元中软读出
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Application No.: US13657061Application Date: 2012-10-22
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Publication No.: US09159407B2Publication Date: 2015-10-13
- Inventor: Tomer Ish-Shalom , Ronen Dar
- Applicant: Apple Inc.
- Applicant Address: US CA Cupertino
- Assignee: Apple Inc.
- Current Assignee: Apple Inc.
- Current Assignee Address: US CA Cupertino
- Agency: Meyertons, Hood, Kivlin, Kowert & Goetzel, P.C.
- Main IPC: G11C11/34
- IPC: G11C11/34 ; G11C11/56 ; G11C16/34 ; G11C29/02

Abstract:
A method includes storing data in a group of analog memory cells by writing respective analog values into the memory cells in the group. After storing the data, the analog values are read from the memory cells in the group one or more times using one or more respective read thresholds so as to produce readout results. Reliability measures are computed for the read analog values based on the readout results. An offset of the one or more read thresholds from an optimal read threshold position is estimated based on the reliability measures. The reliability measures are modified to compensate for the estimated offset, and the data stored in the analog memory cells in the group is decoded using the corrected reliability measures.
Public/Granted literature
- US20140112076A1 SOFT READOUT FROM ANALOG MEMORY CELLS IN THE PRESENCE OF READ THRESHOLD ERRORS Public/Granted day:2014-04-24
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