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Error Correction for TLC and QLC NAND Flash Memories Using Cell-Wise Encoding

  • The growing error rates of triple-level cell (TLC) and quadruple-level cell (QLC) NAND flash memories have led to the application of error correction coding with soft-input decoding techniques in flash-based storage systems. Typically, flash memory is organized in pages where the individual bits per cell are assigned to different pages and different codewords of the error-correcting code. This page-wise encoding minimizes the read latency with hard-input decoding. To increase the decoding capability, soft-input decoding is used eventually due to the aging of the cells. This soft-decoding requires multiple read operations. Hence, the soft-read operations reduce the achievable throughput, and increase the read latency and power consumption. In this work, we investigate a different encoding and decoding approach that improves the error correction performance without increasing the number of reference voltages. We consider TLC and QLC flashes where all bits are jointly encoded using a Gray labeling. This cell-wise encoding improves the achievable channel capacity compared with independent page-wise encoding. Errors with cell-wise read operations typically result in a single erroneous bit per cell. We present a coding approach based on generalized concatenated codes that utilizes this property.

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Metadaten
Author:Daniel Nicolas BailonORCiD, Johann-Philipp ThiersORCiD, Jürgen FreudenbergerORCiDGND
URN:urn:nbn:de:bsz:kon4-opus4-32247
DOI:https://doi.org/10.3390/electronics11101585
ISSN:2079-9292
Parent Title (English):Electronics
Volume:11
Publisher:MDPI
Place of publication:Basel
Document Type:Article
Language:English
Year of Publication:2022
Release Date:2022/10/14
Tag:Non-volatile memory; Channel capacity; Error correction coding; Concatenated codes
Issue:10
Page Number:18 Seiten
Article Number:1585
Note:
Corresponding author: Jürgen Freudenberger
Institutes:Institut für Systemdynamik - ISD
Open Access?:Ja
Relevance:Peer reviewed Publikation in Master Journal List
Licence (German):License LogoCreative Commons - CC BY - Namensnennung 4.0 International