Patents by Inventor Sivagnanam Parthasarathy

Sivagnanam Parthasarathy has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11841753
    Abstract: An operating temperature of a memory sub-system is identified. It is determined whether the operating temperature satisfies a first temperature condition associated with a threshold temperature. Upon determining that the operating temperature satisfies the first temperature condition, one or more operations are performed on at least one data block at a memory component of the memory sub-system until the operating temperature changes to satisfy a second temperature condition associated with the threshold temperature. The one or more operations are selected to be performed based on a difference between the operating temperature and the threshold temperature.
    Type: Grant
    Filed: September 3, 2021
    Date of Patent: December 12, 2023
    Inventors: Shane Nowell, Sivagnanam Parthasarathy
  • Publication number: 20230393736
    Abstract: 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.
    Type: Application
    Filed: June 1, 2022
    Publication date: December 7, 2023
    Inventors: Vamsi Pavan Rayaprolu, Sampath K. Ratnam, Patrick R. Khayat, James Fitzpatrick, Kishore Kumar Muchherla, Sivagnanam Parthasarathy, Ashutosh Malshe
  • Publication number: 20230396269
    Abstract: A processing device in a memory sub-system reads a sense word from a memory device and executes a plurality of parity check equations on corresponding subsets of the sense word to determine a plurality of parity check equation results. The processing device further determines a syndrome for the sense word using the plurality of parity check equation results and determines whether the syndrome for the sense word satisfies a codeword criterion. Responsive to the syndrome for the sense word not satisfying the codeword criterion, the processing device performs an iterative low density parity check (LDPC) correction process using a scaled bit flip threshold to correct one or more errors in the sense word.
    Type: Application
    Filed: June 1, 2022
    Publication date: December 7, 2023
    Inventors: Eyal En Gad, Mustafa N. Kaynak, Sivagnanam Parthasarathy, Yoav Weinberg
  • Publication number: 20230393755
    Abstract: Embodiments disclosed can include determining, for each memory cell connected to each wordline, a respective value of a metric that reflects a sensitivity of a threshold voltage associated with the memory cell to a change in a threshold voltage of an adjacent cell and determining, for each wordline, based on the determined sensitivity for each memory cell, a respective aggregate measure of adjacent cell dependence. They can further include comparing the determined aggregate measure of adjacent cell dependence to a threshold dependence value. They can also include identifying a first wordline group having wordlines with high adjacent cell dependence and a second wordline group having wordlines with low adjacent cell dependence and storing a record referencing the wordlines of the second wordline group, the record indicating a corresponding location on the die of the memory device.
    Type: Application
    Filed: July 8, 2022
    Publication date: December 7, 2023
    Inventors: Mustafa N. Kaynak, Patrick R. Khayat, Sivagnanam Parthasarathy
  • Publication number: 20230393938
    Abstract: Systems and methods are disclosed including a memory device and a processing device operatively coupled to the memory device. The processing device can perform operations comprising selecting a source set of memory cells of the memory device, wherein the source set of memory cells are configured to store a first number of bits per memory cell; performing a data integrity check on the source set of memory cells to obtain a data integrity metric value; determining whether the data integrity metric value satisfies a threshold criterion; and responsive to determining that the data integrity metric value fails to satisfy the threshold criterion, causing the memory device to copy data from the source set of memory cells to a destination set of memory cells of the memory device, wherein the destination set of memory cells are configured to store a second number of bits per memory cell.
    Type: Application
    Filed: July 7, 2022
    Publication date: December 7, 2023
    Inventors: Vamsi Pavan Rayaprolu, Mustafa N. Kaynak, Sivagnanam Parthasarathy, Patrick Khayat, Sampath Ratnam, Kishore Kumar Muchherla, Jiangang Wu, James Fitzpatrick
  • Publication number: 20230396271
    Abstract: A processing device in a memory sub-system determines a syndrome weight for a sense word read from a memory device and determines whether the syndrome weight for the sense word satisfies a threshold criterion. Responsive to the syndrome weight for the sense word satisfying a respective threshold criterion associated with a next iteration of a first decoding operation, bypassing the first decoding operation and initiating a second decoding operation for the sense word, wherein the second decoding operation has a higher error correction capability than the first decoding operation.
    Type: Application
    Filed: June 1, 2022
    Publication date: December 7, 2023
    Inventors: Eyal En Gad, Mustafa N. Kaynak, Yoav Weinberg, Zhengang Chen, Sivagnanam Parthasarathy
  • Publication number: 20230395168
    Abstract: Embodiments disclosed can include identifying wordline groups where each wordline group is associated with a corresponding default program verify (PV) voltage for each programming level, and determining, for each wordline group, a maximum read window budget (RWB) increase. They can further include defining a target aggregate RWB increase amount based on the maximum RWB increase, and determining, for each wordline group, a minimum number of memory cell programming level groups with corresponding PV voltage offsets sufficient to reach the target aggregate RWB increase amount. The embodiments can also include grouping the programming levels of a specified memory cell into the minimum number of programming level, and applying, based on the specific programming level group containing a target programming level, a corresponding PV voltage offset during a memory cell access operation.
    Type: Application
    Filed: July 8, 2022
    Publication date: December 7, 2023
    Inventors: Mustafa N. Kaynak, Patrick R. Khayat, Sivagnanam Parthasarathy
  • Publication number: 20230395161
    Abstract: Embodiments disclosed can include selecting a target read window budget (RWB) increase and identifying a set of aggressor memory cells. They can also include generating a list of programming level states for the set of aggressor memory cells and identifying, in the list, an entry associated with a maximum RWB increase that is greater than or equal to the target RWB increase. They can further include responsive to identifying the entry with the total number of bits associated with a maximum RWB increase that is greater than or equal to the target RWB increase, modifying a parameter of the memory access operation with the adjustment associated with the identified entry.
    Type: Application
    Filed: July 8, 2022
    Publication date: December 7, 2023
    Inventors: Mustafa N. Kaynak, Patrick R. Khayat, Sivagnanam Parthasarathy
  • Patent number: 11837307
    Abstract: Systems and methods are disclosed including a memory device and a processing device operatively coupled to the memory device. The processing device can perform operations including performing, on data residing in a block of the memory device, an error-handling operation of a plurality of error-handling operations, wherein an order of the plurality of error-handling operations is based on a voltage offset bin associated with the block, wherein the voltage offset bin defines a set of threshold voltage offsets to be applied to a base voltage read level during read operations; and responsive to determining that the error-handling operation has failed to recover the data, adjusting the order of the plurality of error-handling operations.
    Type: Grant
    Filed: November 2, 2022
    Date of Patent: December 5, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Kishore Kumar Muchherla, Shane Nowell, Mustafa N. Kaynak, Sampath K. Ratnam, Peter Feeley, Sivagnanam Parthasarathy, Devin M. Batutis, Xiangang Luo
  • Patent number: 11829245
    Abstract: Systems, methods, and apparatus related to a multi-level error correction architecture used for copying data in memory devices. In one approach, user data is stored in the first partition of a non-volatile memory. First error correction code data is generated for the user data and stored with the user data in the first partition. Second error correction code data is generated for the user data and stored outside the first partition. The second error correction code data provides an increased error correcting capability that is compatible with the error correction algorithm used with the first error correction code data. A copyback operation is used to copy the user data and the first error correction code, but not the second error correction code, to a second partition of the non-volatile memory. The second error correction code can be selectively used if there is a need to recover portions of the user data stored in the first partition.
    Type: Grant
    Filed: March 16, 2022
    Date of Patent: November 28, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Mustafa N. Kaynak, Kishore Kumar Muchherla, Sivagnanam Parthasarathy, James Fitzpatrick, Mark A. Helm
  • Patent number: 11829729
    Abstract: Systems, apparatuses, and methods of operating memory systems are described. Processing-in-memory capable memory devices are also described, and methods of performing fused-multiply-add operations within the same. Bit positions of bits stored at one or more portions of one or more memory arrays, may be accessed via data lines by activating the same or different access lines. A sensing circuit operatively coupled to a data line may be temporarily formed and measured to determine a state (e.g., a count of the number of bits that are a logic “1”) of accessed bit positions of a data line, and state information may be used to determine a computational result.
    Type: Grant
    Filed: May 29, 2020
    Date of Patent: November 28, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Sean S. Eilert, Shivasankar Gunasekaran, Ameen D. Akel, Dmitri Yudanov, Sivagnanam Parthasarathy
  • Patent number: 11823722
    Abstract: A processing device of a memory sub-system is configured to identify a read level of a plurality of read levels associated with a voltage bin of a plurality of voltage bins of a memory device; assign a first threshold voltage offset to the read level of the voltage bin; assign a second threshold voltage offset to the read level of the voltage bin; perform, on block associated with the read level, a first operation of a first operation type using the first threshold voltage offset; and perform, on the blocks associated with the read level, a second operation of a second operation type using the second threshold voltage offset.
    Type: Grant
    Filed: February 15, 2023
    Date of Patent: November 21, 2023
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Kishore Kumar Muchherla, Mustafa N Kaynak, Sampath K Ratnam, Shane Nowell, Peter Feeley, Sivagnanam Parthasarathy
  • Patent number: 11823748
    Abstract: A voltage shift for memory cells of a block family at a memory device is measured. The block family is associated with a first voltage offset. An adjusted amount of voltage shift is determined for the memory cells based on the measured voltage shift and a temporary voltage shift offset associated with a difference between a current temperature and a prior temperature for the memory device. The block family is associated with a second voltage offset in view of the adjusted voltage shift.
    Type: Grant
    Filed: August 18, 2022
    Date of Patent: November 21, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Kishore Kumar Muchherla, Karl Schuh, Mustafa N Kaynak, Xiangang Luo, Shane Nowell, Devin Batutis, Sivagnanam Parthasarathy, Sampath Ratnam, Jiangang Wu, Peter Feeley
  • Publication number: 20230359388
    Abstract: Described are systems and methods for memory read calibration based on memory device-originated metadata characterizing voltage distributions. An example memory device comprises: a memory array comprising a plurality of memory cells electrically coupled to a plurality of wordlines; and a controller coupled to the memory array, the controller to perform operations comprising: receiving one or more metadata values characterizing threshold voltage distributions of a subset of the plurality of memory cells connected to one or more bitlines, wherein the one or more metadata values reflect a conductive state of the one or more bitlines; determining a read voltage adjustment value based on the one or more metadata values; and applying the read voltage adjustment value for reading the subset of the plurality of memory cells.
    Type: Application
    Filed: May 3, 2022
    Publication date: November 9, 2023
    Inventors: Dung Viet Nguyen, Patrick R. Khayat, Zhengang Chen, James Fitzpatrick, Sivagnanam Parthasarathy, Eric N. Lee
  • Patent number: 11808806
    Abstract: A system includes a memory component and a processing device, operatively coupled with the memory component, to receive a request to perform a first test of memory components at a test platform, identify test resources of the test platform that are associated with the memory components, identify, among the test resources, a subset of test resources that are not being used by a second test of the memory components at the test platform, and assign, based on the subset of the test resources, a test resource of the test resources to obtain an assigned test resource for use by the test.
    Type: Grant
    Filed: August 10, 2021
    Date of Patent: November 7, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Aswin Thiruvengadam, Sivagnanam Parthasarathy, Frederick Jensen
  • Patent number: 11797383
    Abstract: The present disclosure includes a redundant array of independent NAND for a three dimensional memory array. A number of embodiments include a three-dimensional array of memory cells, wherein the array includes a plurality of pages of memory cells, a number of the plurality of pages include a parity portion of a redundant array of independent NAND (RAIN) stripe, and the parity portion of the RAIN stripe in each respective page comprises only a portion of that respective page.
    Type: Grant
    Filed: February 4, 2021
    Date of Patent: October 24, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Jung Sheng Hoei, Sampath K. Ratnam, Renato C. Padilla, Kishore K. Muchherla, Sivagnanam Parthasarathy, Peter Feeley
  • Patent number: 11797205
    Abstract: A processing device in a memory sub-system detects an occurrence of a triggering event, determines respective levels of charge loss associated with a first representative wordline of a block of a memory device and with a second representative wordline of the block of the memory device, and determines whether a difference between the respective levels of charge loss satisfies a threshold criterion. Responsive to determining that the difference between the respective levels of charge loss satisfies the threshold criterion, the processing device further determines that the block is in a uniform charge loss state.
    Type: Grant
    Filed: February 18, 2022
    Date of Patent: October 24, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Patrick R. Khayat, Steven Michael Kientz, Sivagnanam Parthasarathy, Mustafa N. Kaynak, Vamsi Pavan Rayaprolu
  • Publication number: 20230325273
    Abstract: Systems and methods are disclosed including a memory device and a processing device operatively coupled to the memory device. The processing device can perform operations including detecting a read error with respect to data residing in a first block of the memory device, wherein the first block is associated with a voltage offset bin; determining a most recently performed error-handling operation performed on a second block associated with the voltage offset bin; and performing the error-handling to recover the data.
    Type: Application
    Filed: June 8, 2023
    Publication date: October 12, 2023
    Inventors: Kishore Kumar Muchherla, Shane Nowell, Mustafa N. Kaynak, Sampath K. Ratnam, Peter Feeley, Sivagnanam Parthasarathy, Devin M. Batutis, Xiangang Luo
  • Publication number: 20230315570
    Abstract: Methods, systems, and apparatus for error correction with syndrome computation in a memory device are described. A first syndrome for first encoded data is generated in a memory device. The first syndrome and the first encoded data are transmitted to a controller that is coupled with the memory device. A second syndrome for first and second encoded data is generated. The first encoded data and the second encoded data are interrelated according to an error correction code. The second syndrome is transmitted to the controller without the second encoded data and the controller is to decode the first encoded data based on at least one of the first syndrome, the second syndrome, or a combination thereof.
    Type: Application
    Filed: June 6, 2023
    Publication date: October 5, 2023
    Inventors: Mustafa N. KAYNAK, Patrick R. KHAYAT, Sivagnanam PARTHASARATHY
  • Patent number: 11775381
    Abstract: A plurality of codewords are programmed to one or more memory pages of a memory sub-system. Each memory page of the memory sub-system is associated with a logical unit of a plurality of logical units of the memory sub-system and at least one of a plane of a plurality of planes of the memory sub-system or a block of a plurality of blocks of the memory sub-system. Each codeword of the plurality of codewords comprises host data and base parity bits. A plurality of additional parity bits are programmed to the one or more memory pages of the memory sub-system, wherein each additional parity bit of the plurality of additional parity bits is associated with a codeword of the plurality of standard codewords. A first set of redundancy metadata is generated corresponding to each of the additional parity bits. The first set of redundancy metadata is programmed to a memory page separate from any memory page storing the additional parity bits.
    Type: Grant
    Filed: September 17, 2021
    Date of Patent: October 3, 2023
    Assignee: Micron Technology, Inc.
    Inventors: Zhengang Chen, Sivagnanam Parthasarathy