公开(公告)号：US20240312519A1

公开(公告)日：2024-09-19

申请号：US18666886

申请日：2024-05-17

Applicant: KIOXIA CORPORATION

Inventor： Tomonori TAKAHASHI ,  Masanobu SHIRAKAWA ,  Osamu TORII ,  Marie TAKADA

IPC: G11C11/56 ,  G11C16/04 ,  G11C16/08 ,  G11C16/26

CPC classification number: G11C11/5671 ,  G11C16/0483 ,  G11C16/08 ,  G11C16/26

Abstract: According to one embodiment, a semiconductor memory device includes: a memory cell configured to hold 5-bit data; a word line coupled to the memory cell; and a row decoder configured to apply first to 31st voltages to the word line. A first bit of the 5-bit data is established by reading operations using first to sixth voltages. A second bit of the 5-bit data is established by reading operations using seventh to twelfth voltages. A third bit of the 5-bit data is established by reading operations using thirteenth to eighteenth voltages. A fourth bit of the 5-bit data is established by reading operations using nineteenth to 25th voltages. A fifth bit of the 5-bit data is established by reading operations using 26th to 31st voltages.

公开(公告)号：US20210295153A1

公开(公告)日：2021-09-23

申请号：US17184026

申请日：2021-02-24

Applicant: KIOXIA CORPORATION

Inventor： Ryota YOSHIZAWA ,  Kenichiro FURUTA ,  Yuma YOSHINAGA ,  Osamu TORII ,  Tomoya KODAMA

IPC: G06N3/08 ,  G06N3/04 ,  H03M13/45

Abstract: A learning device includes an encoding unit, a plurality of permutation units, a plurality of decoding units, a selection unit, and a learning unit. The encoding unit is configured generate an encoded word by encoding a transmission word. The permutation units are configured to permutate the encoded word according to different permutation manners to generate a plurality of permutated encoded words. The decoding units are configured to perform message passing decoding on the plurality of permutated encoded words, to generate a plurality of decoded words. The message passing decoding involves weighting of values of a word transmitted during the message passing decoding. The selection unit is configured to select one or more of the decoded words. The learning unit is configured to perform learning of weighting values of the weighting based on the transmission word and the selected one or more of the decoded words.