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- W2783136277 abstract "Fractional bits-per-cell can be realized by a non- power-of-two number of levels in NAND flash. They provide a larger number of modes beyond existing 4-level (MLC), 8-level (TLC), and 16-level (QLC) NAND flash and enable a smoother transition between existing modes, which increase the lifetime write capacity of the NAND device. Existing techniques for $q$-ary levels (where $q$ is non-power-of-two) have a weakness in that $q-1$ read thresholds are required to extract the exact cell-level information for decoding the data. In this paper, we provide logical-to-physical mappings between data and their physical programmed cell levels such that the read latency can be reduced by 2 or 3 times. In particular, we provide several mappings for $q=6$ and $q=12$ that enable 2.5 and 3.5 bits per cell. For non-power-of-two $q$-ary cells, the proposed mapping can be viewed as the counterpart of the Gray code used in MLCs, TLCs, and QLCs to map binary data into one of $q=4,8$ and $16$ levels. We also provide the probability transition matrix-based channel models to extract soft information (e.g., log-likelihood ratios) in our mapping. Finally, we show that non-binary error- correction codes (ECCs) for our proposed mapping have higher data rate than binary ECCs to achieve the same data reliability." @default.
- W2783136277 created "2018-01-26" @default.
- W2783136277 creator A5084528785 @default.
- W2783136277 date "2017-12-01" @default.
- W2783136277 modified "2023-09-26" @default.
- W2783136277 title "Fractional Bits-Per-Cell for NAND Flash with Low Read Latency" @default.
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- W2783136277 doi "https://doi.org/10.1109/glocom.2017.8254419" @default.
- W2783136277 hasPublicationYear "2017" @default.
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