Invention Grant
- Patent Title: Positioning read thresholds in a nonvolatile memory based on successful decoding
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Application No.: US17388048Application Date: 2021-07-29
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Publication No.: US11621048B2Publication Date: 2023-04-04
- Inventor: Yonathan Tate , Ilia Benkovitch , Michael Jeffet , Nir Tishbi , Roy Roth , Ruby Mizrahi
- Applicant: APPLE INC.
- Applicant Address: US CA Cupertino
- Assignee: APPLE INC.
- Current Assignee: APPLE INC.
- Current Assignee Address: US CA Cupertino
- Agency: Kligler & Associates Patent Attorneys Ltd
- Main IPC: G11C29/42
- IPC: G11C29/42 ; G11C29/44 ; H03M13/29 ; G11C16/26 ; G11C16/10

Abstract:
A memory controller includes an interface and a processor. The interface communicates with a plurality of memory cells, and an individual one of the plurality of memory cells stores data in multiple predefined programming levels. The processor is configured to read an Error Correction Code (ECC) code word from a group of memory cells, via the interface, using multiple read thresholds positioned between adjacent programming levels, for producing multiple readouts that contain respective numbers of errors, to derive from the code word a reference readout that contains no errors, or contains a number of errors smaller than in the code word, to calculate multiple distances between the reference readout and the respective readouts, and set a preferred read threshold based on the calculated distances, and to perform subsequent read operations for retrieving data from the plurality of memory cells, using the preferred read threshold.
Public/Granted literature
- US20230031584A1 Positioning read thresholds in a nonvolatile memory based on successful decoding Public/Granted day:2023-02-02
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