Samsung Electronics Co., Ltd.

Western Digital Technologies, Inc.

St-ericsson Sa

Telefonaktiebolaget Lm Ericsson (publ)

Oct Circuit Technologies International Limited

Saugata Das Purkayastha

Rowen Alphonso Pereira

Srikanth Tumkur Shivanand

Abhinav Kumar Singh

Suresh Vishnoi

Revanasiddaiah Prabhuswamy Mathada

Anantharaj Thalaimalaivanaraj

Mahesh Sreekandath

Chandrashekhar Mallikarjuna Joshi

Nisha Padattil Kuliyampattil

Vijaya Kumar Kilari

The disclosure relates to a method and data storage device for managing host requests in the data storage device. The method includes receiving, from a host device, a read request for reading data from the data storage device, identifying a type of the read request, and based on the type of the read request being a random read request, performing one or more first operations related to processing of the read request in parallel with one or more second operations including: fetching a logical block address of the data from the read request; and obtaining a logical-to-physical (L2P) mapping table from a first memory associated with the data storage device, based on the logical block address, the L2P mapping table used for reading the data from the data storage device.

Method and data storage device for managing host requests in data storage device

A method of operating a non-volatile memory device is provided. The device includes a latch, a page buffer and blocks, each of which includes pages. The method includes: receiving a page command for a write operation corresponding to a page of one of the blocks; receiving a write command for writing data to the page buffer; latching preexisting latched data or random data generated as latched data; writing the latched data to a page of a new block from among the plurality of blocks that corresponds to a page address based on the write command; and repeatedly updating the page address and repeatedly writing the latched data to additional pages corresponding to each updated page address until each page of the new block has been written to.

Method and apparatus for configuring a non-volatile memory device without data transfer

In a method of organizing data during refresh cycles of a memory device, a read request is sent to a non-volatile flash memory including a plurality of source blocks and a plurality of destination blocks. Data of the plurality of source blocks are read upon sending the read request. The frequency of bit error rate (BER) for the data stored in the plurality of source blocks is identified. The data within the plurality of source blocks are grouped and segregated based on the frequency of BER and a threshold value. The plurality of source blocks and the plurality of destination blocks are refreshed by moving the data present in the plurality of source blocks to respective destination blocks based on the segregated data and moving data from the respective destination blocks to other respective destination blocks.

Method, memory controller and method device that organizes data during refresh cycles

A method for performing a write operation includes selecting, by a host, at least a free write buffer from a plurality of write buffers of a shared memory buffer (SMB) by accessing a cache structure within the SMB for tracking the free write buffer; sending, by the host, at least a logical address accessed from the cache structure with respect to the selected write buffer to issue a write-command to a non-volatile memory; receiving a locking instruction of the selected write buffer from the non-volatile memory; updating a status of the selected write buffer within the cache structure based on the received locking instruction; and allowing the non-volatile memory to extract contents of one or more locked write buffers including the selected write buffer.

Method and system for performing read/write operation within a computing system hosting non-volatile memory

A method for offloading a lookup operation to a NAND offload apparatus, including receiving, by the NAND offload apparatus, a NAND read command from a key-value solid-state drive (KV SSD) NAND interface, wherein the NAND offload apparatus is connected between the KV SSD NAND interface and a NAND device using a NAND bus; determining whether the NAND read command includes an information element indicating an indirect read operation; based on the NAND read command including the information element, performing the indirect read operation by the NAND offload apparatus; and based on the NAND read command not including the information element: passing, by the NAND offload apparatus, the NAND read command to the NAND device through the NAND bus, and configuring, by the NAND offload apparatus, a switch an output gate to pass a response message from the NAND device to the KV SSD NAND interface.

Method and system for offloading lookup operation to NAND offload apparatus

The present disclosure provides a method of logical to physical mapping for a data-storage device comprising a non-volatile memory device. The method comprises maintaining a first type of information representing at least a part of a logical-to-physical address translation map. Further, the method comprises maintaining a second type of information pertaining to the logical-to-physical translation map as a part of a physical page. Further, the method comprises completing a logical-to-physical mapping based on the first and second type of information to thereby determine a physical location, within one or more of the physical pages, of the data stored in each logical page.

Method and system for logical to physical (L2P) mapping for data-storage device comprising nonvolatile memory

Embodiments herein disclose a method for managing seed value for data scrambling in a NAND memory. The method includes detecting, by a NAND controller, a first scrambling of the data of a word line in the NAND memory. The method further includes caching, by the NAND controller, at least one of a last written data of the word line post the first scrambling for each open block in a Dynamic Random Access Memory (DRAM) for programming the word line, and a super page of the last written data of the word line in the DRAM for programming the super page. The method can be used to manage the seed value which is used for NAND page scrambling, which can reduce retention effect. As a result, the retention recycles for the NAND cells may be reduced, which may improve endurance.

Method and apparatus for managing seed value for data scrambling in NAND memory

The disclosure relates in some aspects to suspending a read for a non-volatile memory (NVM) device. For example, a lower priority read may be suspended to enable a higher priority read to occur. Once the higher priority read completes, the lower priority read is resumed. To improve the efficiency of the read suspension, the lower priority read may be suspended once data sensing at a current level of the NVM device completes. The data for each level that has already been sensed is then stored so that this data does not need to be sensed again. Once the lower priority read is resumed, the data sensing starts at the next level of the NVM device. The data output for the lower priority read thus includes the stored data for any levels read before the read is suspended, along with the data from the levels read after the read is resumed.

Suspending and resuming a read operation for a non-volatile memory

Aspects of the disclosure provide for control of a flash translation layer (FTL) in a non-volatile memory (NVM). Disclosed methods and apparatus provide for receiving a message in the FTL, which is transmitted from a host device, and includes desired recycle ratio information that is determined by the host where the ratio is a number of host writes to a number of recycle writes to be performed by the FTL. Based on the recycle ratio information, the FTL determines a target recycle ratio and performs recycling of memory blocks in the NVM based on the determined target recycle ratio. In this manner, the host device is able to exert control over the recycle ratio utilized in the FTL via a transmitted message, which allows the recycle ratio to be more adaptive to host write conditions known to the host device, but not known in the SSD.

Methods and apparatus for controlling flash translation layer recycle from host

Exemplary embodiments provide for compressing, storing, retrieving and decompressing paged code from mass storage devices. By evaluating the size of compressed virtual pages relative to the storage page (read unit) of the mass storage device into which the compressed virtual pages are to be stored, decisions can be made which facilitate later read out and decompression of those compressed virtual pages. According to exemplary embodiments, a virtual page can be stored uncompressed, compressed but undivided or compressed and subdivided into a plurality of parts based on an evaluation.

Methods and devices for reducing compressed page loading time on page fault

Methods for receiving data from a file system and storing it in a flash storage medium, wherein a bad block management process comprises queuing, at a bad block manager, one or more write requests, and receiving data associated with each of the one or more write requests and storing the received data in the bad block manager buffer; and performing cache management of data in the bad block manager buffer and subsequently returning a success status to the file system; and executing the one or more queued write requests in a separate task, wherein the executing comprises programming the received data to the flash storage medium during the bad block management process. Corresponding devices are also provided.

Asynchronous bad block management in NAND flash memory

The invention provides a method for controlling writing of data to a data storage card having a device controller and a storage medium. Particularly, the device controller receives a meta data synchronization disable command and in response, enters a first mode. In the first mode, the device controller does not synchronize meta data related to a data write request to write the data to the storage medium, leaving corresponding unsynchronized meta data. The device controller receives a data write request to write the data, and in response, effects the data write request such that the data is written to the storage medium. However, the meta data related to the data write request is not synchronized to the storage medium. Other aspects provide a corresponding device controller and software/firmware.

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Bengaluru, India

Saugata Das Purkayastha