Patents by Inventor Kishore Kumar Muchherla

Kishore Kumar Muchherla 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: 11521699
    Abstract: A first scan operation of a set of memory pages of a data block is performed using a first reliability threshold level to identify a set of scan results. A workload type associated with the data block is determined based on the set of scan results. The first reliability threshold level is adjusted to a second reliability threshold level based on the workload type. A second scan operation of the set of memory pages of the data block is performed using the second reliability threshold level.
    Type: Grant
    Filed: October 30, 2020
    Date of Patent: December 6, 2022
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Vamsi Pavan Rayaprolu, Kishore Kumar Muchherla, Ashutosh Malshe, Gianni S. Alsasua, Harish R. Singidi
  • Publication number: 20220383962
    Abstract: 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.
    Type: Application
    Filed: August 12, 2022
    Publication date: December 1, 2022
    Inventors: Kishore Kumar Muchherla, Harish R. Singidi, Renato C. Padilla, Vamsi Pavan Rayaprolu, Ashutosh Malshe, Sampath K. Ratnam
  • Publication number: 20220383955
    Abstract: A processing device of a memory sub-system is configured to detect a power on event that is associated with a memory device and indicates that power has been restored to the memory device; estimate a duration of a power off state preceding the power on event associated with the memory device; and update voltage bin assignments of a plurality of blocks associated with the memory device based on the duration of the power off state.
    Type: Application
    Filed: August 8, 2022
    Publication date: December 1, 2022
    Inventors: Kishore Kumar MUCHHERLA, Sampath K. RATNAM, Shane NOWELL, Sivagnanam PARTHASARATHY, Mustafa N. KAYNAK, Karl D. SCHUH, Peter FEELEY, Jiangang WU
  • Publication number: 20220375530
    Abstract: A system includes a memory device and a processing device. The processing device performs, at a first frequency, a first scan of a page of a block family that measures a first data state metric and identifies a specific bin corresponding to a measured value for the first data state metric. Processing device updates a bin, to which the page is assigned, to match the specific bin. Processing device performs, at a second frequency higher than the first frequency, a second scan of the page to measure a second data state metric for read operations performed using a threshold voltage offset value from each of multiple bins. Processing device updates the bin, to which the page is assigned for the specified die, to match a second bin having the threshold voltage offset value that yields a lowest read bit error rate from the second scan.
    Type: Application
    Filed: August 4, 2022
    Publication date: November 24, 2022
    Inventors: Kishore Kumar Muchherla, Shane Nowell, Mustafa N. Kaynak, Karl D. Schuh, Jiangang Wu, Devin M. Batutis, Xiangang Luo
  • Patent number: 11507300
    Abstract: A processing device detects a read operation at a memory device that is directed at a word line group from among multiple word line groups of the memory device. The processing device increments a read counter associated with the word line group based on the read operation being directed at the word line group. The processing device determines the read counter exceeds a read-disturb threshold and performs read-disturb handling on the word line group in response to determining the read counter exceeds the read-disturb threshold.
    Type: Grant
    Filed: October 26, 2020
    Date of Patent: November 22, 2022
    Assignee: Micron Technology, Inc.
    Inventors: Michael G. Miller, Ashutosh Malshe, Gianni Stephen Alsasua, Renato Padilla, Jr., Vamsi Pavan Rayaprolu, Kishore Kumar Muchherla, Harish Reddy Singidi
  • Patent number: 11507317
    Abstract: A program operation is executed on a memory sub-system. In response to receiving a request to execute a read operation, executing a first program suspend operation to suspend the program operation. In response to a completion of the read operation, a program resume operation is executed to resume execution of the program operation. A delay period is established following execution of the program resume operation during which execution of the program operation is completed. A second program suspend operation is executed following the delay period.
    Type: Grant
    Filed: November 20, 2020
    Date of Patent: November 22, 2022
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Jiangang Wu, Sampath K. Ratnam, Yang Zhang, Guang Chang Ye, Kishore Kumar Muchherla, Hong Lu, Karl D. Schuh, Vamsi Pavan Rayaprolu
  • Patent number: 11500564
    Abstract: A block family associated with a memory device is initialized. An initial value of a power cycle count associated with the memory device is stored. Responsive to programming a block residing in the memory device, the block is associated with the block family. Responsive to determining that a current value of the power cycle count exceeds the initial value of the power cycle count, the block family is closed. Responsive to determining that a time period that has elapsed since initializing the block family exceeds a threshold period, the block family is closed.
    Type: Grant
    Filed: January 20, 2021
    Date of Patent: November 15, 2022
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Kishore Kumar Muchherla, Mustafa N. Kaynak, Jiangang Wu, Sampath K. Ratnam, Sivagnanam Parthasarathy, Peter Feeley, Karl D. Schuh
  • Publication number: 20220357873
    Abstract: An example memory sub-system comprises: a memory device; and a processing device, operatively coupled with the memory device. The processing device is configured to: receive a first host data item; store the first host data item in a first page of a first logical unit of a memory device, wherein the first page is associated with a fault tolerant stripe; receive a second host data item; store the second host data item in a second page of the first logical unit of the memory device, wherein the second page is associated with the fault tolerant stripe, and wherein the second page is separated from the first page by one or more wordlines including a dummy wordline storing no host data; and store, in a third page of a second logical unit of the memory device, redundancy metadata associated with the fault tolerant stripe.
    Type: Application
    Filed: July 25, 2022
    Publication date: November 10, 2022
    Inventors: Kishore Kumar Muchherla, Mark A. Helm, Giuseppina Puzzilli, Peter Feeley, Yifen Liu, Violante Moschiano, Akira Goda, Sampath K. Ratnam
  • Publication number: 20220351786
    Abstract: A determination that a first programming operation has been performed on a particular memory cell can be made. A determination can be made, based on one or more threshold criteria, whether the particular memory cell has transitioned from a state associated with a decreased error rate to another state associated with an increased error rate. In response to determining that the particular memory cell has transitioned from the state associated with the decreased error rate to the another state associated with the increased error rate, an operation can be performed on the particular memory cell to transition the particular memory cell from the another state associated with the increased error rate to the state associated with the decreased error rate.
    Type: Application
    Filed: July 19, 2022
    Publication date: November 3, 2022
    Inventors: Vamsi Pavan Rayaprolu, Kishore Kumar Muchherla, Peter Feeley, Sampath K. Ratnam, Sivagnanam Parthasarathy, Qisong Lin, Shane Nowell, Mustafa N. Kaynak
  • Publication number: 20220350488
    Abstract: An example memory sub-system includes a memory device and a processing device, operatively coupled to the memory device. The processing device is configured to identify a first block family comprising a first set of blocks, wherein the first block family comprises a plurality of blocks that have been programmed within at least one of a specified time window or a specified temperature window; identify a second block family comprising a second set of blocks; and responsive to a determining that a threshold criterion is satisfied, combine the first block family and the second block family by appending, to first block family metadata of the first block family, a record referencing the second set of blocks.
    Type: Application
    Filed: July 19, 2022
    Publication date: November 3, 2022
    Inventors: Michael Sheperek, Kishore Kumar Muchherla, Shane Nowell
  • Publication number: 20220342813
    Abstract: A highly read data manager of a memory device receives a request to perform receives a request to perform a data relocation operation on a first wordline of a plurality of wordlines for a memory device, the memory device comprising a plurality of multi-level memory cells, wherein each multi-level memory cell comprises a plurality of pages; determines at the first wordline comprises data stored at one or more high read disturb pages of the plurality of pages; determines whether the data comprises a characteristic that satisfies a threshold criterion in relation to additional data stored on additional wordlines of the plurality of wordlines; responsive to determining that the data comprises the characteristic that satisfies the threshold criterion, identifies one or more low read disturb pages of the plurality of pages of a target wordline for relocating the data; and responsive to identifying the one or more low read disturb pages of the target wordline, stores at least a portion of the data at the one or more
    Type: Application
    Filed: April 22, 2021
    Publication date: October 27, 2022
    Inventors: Kishore Kumar Muchherla, Giuseppina Puzzilli, Vamsi Pavan Rayaprolu, Ashutosh Malshe, James Fitzpatrick, Shyam Sunder Raghunathan, Violante Moschiano, Tecla Ghilardi
  • Publication number: 20220343985
    Abstract: Described are systems and methods for providing power loss immunity in memory programming operations. An example memory device comprises: a memory array comprising a plurality of memory cells electrically coupled to a plurality of wordlines and a plurality of bitlines; and a controller coupled to the memory array, the controller to perform operations comprising: causing a programming pulse to be applied to to one or more wordlines of the memory array; responsive to determining that a threshold voltage of one or more memory cells of the memory array has reached a pre-program verify level, causing a first bias voltage level to be applied to a first subset of bitlines of the memory array and causing a second bias voltage level to be applied to a second subset of bitlines of the memory array.
    Type: Application
    Filed: April 23, 2021
    Publication date: October 27, 2022
    Inventors: Scott A. Stoller, Pitamber Shukla, Kishore Kumar Muchherla, Fulvio Rori, Bin Wang
  • Publication number: 20220336023
    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: Application
    Filed: April 16, 2021
    Publication date: October 20, 2022
    Inventors: Kishore Kumar Muchherla, Mustafa N. Kaynak, Sampath K. Ratnam, Shane Nowell, Peter Feeley, Sivagnanam Parthasarathy
  • Publication number: 20220334751
    Abstract: Exemplary methods, apparatuses, and systems include receiving a plurality of read operations directed to a portion of memory accessed by a memory channel. The plurality of read operations are divided into a current set of a sequence of read operations and one or more other sets of sequences of read operations. An aggressor read operation is selected from the current set. A supplemental memory location is selected independently of aggressors and victims in the current set of read operations. A first data integrity scan is performed on a victim of the aggressor read operation and a second data integrity scan is performed on the supplemental memory location.
    Type: Application
    Filed: April 15, 2021
    Publication date: October 20, 2022
    Inventors: Saeed Sharifi Tehrani, Ashutosh Malshe, Kishore Kumar Muchherla, Sivagnanam Parthasarathy, Vamsi Pavan Rayaprolu
  • Publication number: 20220334756
    Abstract: Disclosed is a system that comprises a memory device and a processing device, operatively coupled with the memory device, to perform operations that include, receiving a read request to perform a read operation on a block of the memory device; determining whether an entry corresponding to the block is stored in a data structure associated with the memory device; responsive to the entry being stored in the data structure, incrementing a counter associated with the block to track a number of read operations performed on the block of the memory device; resetting a timer associated with the block to an initial value, wherein the timer is to track a period of time that elapses since the read operation was performed on the block of the memory device; determining that the counter and the timer satisfy a first criterion; and responsive to determining that the counter and the timer satisfy the first criterion, removing the entry corresponding to the block from the data structure associated with the memory device.
    Type: Application
    Filed: April 20, 2021
    Publication date: October 20, 2022
    Inventors: Vamsi Pavan Rayaprolu, Kishore Kumar Muchherla, Ashutosh Malshe, Giuseppina Puzzilli, Saeed Sharifi Tehrani
  • Publication number: 20220334752
    Abstract: A processing device of a memory sub-system is configured to identify a plurality of blocks assigned to a first voltage bin of a plurality of voltage bins of a memory device; identify a subset of the plurality of blocks having a time after program (TAP) within a predetermined threshold period of time from a second TAP associated with a transition boundary between the first voltage bin and a subsequent voltage bin of the plurality of voltage bins; determine a threshold voltage offset associated with the subset of blocks; and associate the threshold voltage offset with the subsequent voltage bin.
    Type: Application
    Filed: April 16, 2021
    Publication date: October 20, 2022
    Inventors: Kishore Kumar MUCHHERLA, Sampath K RATNAM, Shane NOWELL, Peter FEELEY, Sivagnanam Parthasarathy, Mustafa N Kaynak
  • Patent number: 11475969
    Abstract: A system includes a memory array with sub-blocks, each sub-block having groups of memory cells. A processing device, operatively coupled with the memory array, is to perform operations including performing, after a wordline is programmed through the sub-blocks, scanning of the wordline. The scanning includes selecting, to sample first data of the wordline, a first group of the groups of memory cells of a first sub-block of the sub-blocks; selecting, to sample second data of the wordline, a second group of the groups of memory cells of a second sub-block of the sub-blocks; concurrently reading the first data from the first group and the second data from the second group of the groups of memory cells; and performing an error check of the wordline using the first data and the second data.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: October 18, 2022
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Kishore Kumar Muchherla, Violante Moschiano, Sead Zildzic, Junwyn A. Lacsao, Paing Z. Htet
  • Patent number: 11474738
    Abstract: Exemplary methods, apparatuses, and systems include receiving a plurality of read operations directed to a portion of memory accessed by a memory channel. The plurality of read operations are divided into a current set of a sequence of read operations and one or more other sets of sequences of read operations. An aggressor read operation is selected from the current set. A supplemental memory location is selected independently of aggressors and victims in the current set of read operations. A first data integrity scan is performed on a victim of the aggressor read operation and a second data integrity scan is performed on the supplemental memory location.
    Type: Grant
    Filed: April 15, 2021
    Date of Patent: October 18, 2022
    Assignee: MICRON TECHNOLOGY, INC.
    Inventors: Saeed Sharifi Tehrani, Ashutosh Malshe, Kishore Kumar Muchherla, Sivagnanam Parthasarathy, Vamsi Pavan Rayaprolu
  • Patent number: 11467980
    Abstract: A first block that is assigned a first sequence identifier can be identified. A determination can be made as to whether the assigned first sequence identifier satisfies a threshold sequence identifier condition that corresponds to a difference between the first sequence identifier assigned to the first block and second sequence identifier assigned to a second block. In response to determining that the assigned first sequence identifier satisfies the threshold sequence identifier condition, a media management operation can be performed on the first block.
    Type: Grant
    Filed: January 10, 2020
    Date of Patent: October 11, 2022
    Assignee: Micron Technology, Inc.
    Inventors: Kishore Kumar Muchherla, Peter Feeley, Sampath K. Ratnam, Ashutosh Malshe
  • Publication number: 20220318086
    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 block of the memory device, wherein the block is associated with a voltage offset bin, determining an ordered set of error-handling operations to be performed to the data, determining a most recently performed error-handling operation associated with the voltage offset bin; adjusting an order of the set of error-handling operations by positioning the most recently performed error-handling operation within a predetermined position in the order of the set of error-handling operations; and performing one or more error-handling operations of the set of error-handling operations in the adjusted order until data associated to the read error is recovered.
    Type: Application
    Filed: March 30, 2021
    Publication date: October 6, 2022
    Inventors: Kishore Kumar Muchherla, Shane Nowell, Mustafa N. Kaynak, Sampath K. Ratnam, Peter Feeley, Sivagnanam Parthasarathy, Devin M. Batutis, Xiangang Luo