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公开(公告)号：US20180196705A1
公开(公告)日：2018-07-12
申请号：US15911490
申请日：2018-03-05
发明人： Michael G. Miller , Ashutosh Malshe , Violante Moschiano , Peter Feeley , Gary F. Besinga , Sampath K. Ratnam , Walter Di-Francesco , Renato C. Padilla, JR. , Yun Li , Kishore Kumar Muchherla
CPC分类号： G06F11/073 , G06F3/0619 , G06F3/0659 , G06F3/0679 , G06F11/0751 , G06F11/0772 , G06F11/079
摘要： Apparatus include controllers configured to iteratively program a group of memory cells to respective desired data states; determine whether a power loss to the apparatus is indicated while iteratively programming the group of memory cells; and if a power loss to the apparatus is indicated, to change the desired data state of the particular memory cell before continuing with the programming. Apparatus further include controllers configured to read a particular memory cell of a last written page of memory cells, determine whether a threshold voltage of the particular memory cell is less than a particular voltage level, and to mark the last written page of memory cells as affected by power loss during a programming operation of the last written page of memory cells when the threshold voltage of the particular memory cell is determined to be higher than the particular voltage level.
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公开(公告)号：US12131790B2
公开(公告)日：2024-10-29
申请号：US18125595
申请日：2023-03-23
IPC分类号： G06F11/10 , G06F3/06 , G06F11/34 , G06F12/02 , G06F12/0891 , G06F16/11 , G06F16/16 , G06F16/17 , G11C16/10 , G11C16/16 , G11C16/26 , G11C16/34
CPC分类号： G11C16/3495 , G06F12/0891 , G11C16/102 , G11C16/16 , G11C16/26 , G06F2212/1016 , G06F2212/7201 , G06F2212/7211
摘要： A method includes determining that a ratio of valid data portions to a total quantity of data portions of a block of memory cells is greater than or less than a valid data portion threshold and determining that health characteristics for the valid data portions of the block of memory cells are greater than or less than a valid data health characteristic threshold. The method further includes performing a first media management operation on the block of memory cells in response to determining that the ratio of valid data portions to the total quantity of data portions is greater than the valid data portion threshold and performing a second media management operation on at least a portion of the block of memory cells in response to determining that the ratio of valid data portions to the total quantity of data portions is less than the valid data portion threshold and the health characteristics for the valid data portions are greater than the valid data health characteristic threshold.
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公开(公告)号：US20240168879A1
公开(公告)日：2024-05-23
申请号：US18386760
申请日：2023-11-03
发明人： Akira Goda , Kishore K. Muchherla , Shyam Sunder Raghunathan , Leo Raimondo , Jung Sheng Hoei , Xiangang Luo , Ashutosh Malshe , Jianmin Huang
IPC分类号： G06F12/02
CPC分类号： G06F12/0246
摘要： An apparatus can comprise a memory array comprising a plurality of strings of memory cells each comprising: a first group of memory cells coupled to a first group of access lines and corresponding to a first erase block; and a second group of memory cells coupled to a second group of access lines and corresponding to a second erase block. A controller is configured to determine a cumulative amount of read disturb stress experienced by the first erase block by monitoring read disturb stress experienced by the first erase block due to: read operations performed on the first erase block; read operations performed on the second erase block; and program verify operations performed on the second erase block. The controller can perform an action on the first erase block responsive to the cumulative amount of read disturb stress experienced by the first erase block meeting a criteria.
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公开(公告)号：US11914878B2
公开(公告)日：2024-02-27
申请号：US17576033
申请日：2022-01-14
发明人： Ashutosh Malshe , Antonio D. Bianco
CPC分类号： G06F3/064 , G06F3/0619 , G06F3/0652 , G06F3/0659 , G06F3/0679 , G06F12/0253 , G06F2212/7211
摘要： A method includes determining a health characteristic value of a block of memory cells, determining a difference between the health characteristic value and a health threshold, determining, based on the difference, a weight to associate with a block of memory cells, selecting, based on the weight, a block of memory cells for a media management operation; and performing a media management operation on the selected block of memory cells.
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公开(公告)号：US11907536B2
公开(公告)日：2024-02-20
申请号：US18093069
申请日：2023-01-04
IPC分类号： G06F3/06
CPC分类号： G06F3/0608 , G06F3/0646 , G06F3/0679
摘要： A method includes determining a respective number of and respective locations of valid data portions of a plurality of blocks of NAND memory cells, based on the respective locations of the valid data portions, determining respective dispersions of the valid data portions within the plurality of blocks of NAND memory cells, based at least on the respective dispersions, selecting a block of NAND memory cells from the plurality of blocks of NAND memory cells, and performing a folding operation on the selected block.
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公开(公告)号：US20230393736A1
公开(公告)日：2023-12-07
申请号：US17830166
申请日：2022-06-01
发明人： Vamsi Pavan Rayaprolu , Sampath K. Ratnam , Patrick R. Khayat , James Fitzpatrick , Kishore Kumar Muchherla , Sivagnanam Parthasarathy , Ashutosh Malshe
IPC分类号： G06F3/06
CPC分类号： G06F3/0608 , G06F3/0679 , G06F3/0655
摘要： One of a plurality of compaction strategies to be performed on the memory device based on at least one characteristic of a memory device is identified. Each of the plurality of compaction strategies is to program host data from at least one single-level cell (SLC) of the memory device to at least one quad-level cell (QLC) of the memory device. One or more host data from a host system is received. A compaction operation on the one or more host data using the one of the plurality of compaction strategies is performed.
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公开(公告)号：US11829290B2
公开(公告)日：2023-11-28
申请号：US17247805
申请日：2020-12-23
CPC分类号： G06F12/0253 , G06F2212/1044
摘要： A processing device in a memory system determines a rate at which an amount of valid data is decreasing on a first block of the memory device and determines whether the rate at which the amount of valid data is decreasing on the first block satisfies a threshold criterion. Responsive to the rate at which the amount of valid data is decreasing on the first block satisfying the threshold criterion, the processing device performs a media management operation on the first block of the memory device.
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公开(公告)号：US11810627B2
公开(公告)日：2023-11-07
申请号：US17886884
申请日：2022-08-12
发明人： Kishore Kumar Muchherla , Harish R. Singidi , Renato C. Padilla , Vamsi Pavan Rayaprolu , Ashutosh Malshe , Sampath K. Ratnam
CPC分类号： G11C16/3431 , G06F11/076 , G06F11/3037 , G11C16/08 , G11C16/349 , G11C16/3427
摘要： A processing device in a memory system maintains a counter to track a number of read operations performed on a data block of a memory device and determines that the number of read operations performed on the data block satisfies a first threshold criterion. The processing device further determines whether a number of scan operations performed on the data block satisfies a scan threshold criterion. Responsive to the number of scan operations performed on the data block satisfying the scan threshold criterion, the processing device performs a first data integrity scan to determine one or more first error rates for the data block, each of the one or more first error rates corresponding to a first set of wordlines of the data block, the first set comprising first alternating pairs of adjacent wordlines.
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公开(公告)号：US11755472B2
公开(公告)日：2023-09-12
申请号：US17375478
申请日：2021-07-14
发明人： Kishore Kumar Muchherla , Peter Sean Feeley , Sampath K. Ratnam , Ashutosh Malshe , Christopher S. Hale
IPC分类号： G06F12/128 , G06F12/02 , G06F12/0897
CPC分类号： G06F12/0253 , G06F12/0246 , G06F12/0897 , G06F12/128
摘要： A method includes identifying a first block of a plurality of blocks stored at a first memory based on an amount of valid data of the first block, and writing the valid data of the first block from the first memory to a second memory. The first memory has a first memory type and the second memory has a second memory type different from the first memory type. The method further includes identifying a second block of the plurality of blocks stored at the first memory based on an age of valid data of the second block, determining that the age of the valid data of the second block satisfies a threshold condition, and in response to determining that the age of the valid data of the second block satisfies the threshold condition, writing the valid data of the second block from the first memory to the second memory.
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公开(公告)号：US11740957B2
公开(公告)日：2023-08-29
申请号：US17506505
申请日：2021-10-20
发明人： Vamsi Pavan Rayaprolu , Harish R. Singidi , Kishore Kumar Muchherla , Ashutosh Malshe , Xiangang Luo
IPC分类号： G06F11/07
CPC分类号： G06F11/0793 , G06F11/0727 , G06F11/0751
摘要： A failure of a first memory access operation is detected at a memory device. Responsive to the detection, a first error control operation and a second error control operation are performed. In response to a determination that the second error control operation has remedied the failed first memory access operation, the second error control operation is associated with a second priority which is higher than a first priority associated with the first error control operation.
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