Toshiba Memory Corporation

Lsi Corporation

Sancar Kunt Olcay

Johnson Yen

Lei Chen

Dishi Lai

Madhusudan Kalluri

Zongwang Li

Yang Han

Changyou Xu

Zhimin Ding

Kaichi Zhang

Jianqing Chen

Ngok Ying Chu

Sathiyanarayanan Sampath Kumar

In an example, a method of processing commands for a non-volatile storage device includes storing the commands among a plurality of first-level queues in a random access memory (RAM). Each command is assigned to a first-level queue based on membership in one of a plurality of first-level categories. The method further includes removing selected commands from the plurality of first-level queues according to a first schedule and performing at least one operation on the selected commands. The method further includes storing the selected commands among a plurality of second-level queues in the RAM. Each selected command is assigned to a second-level queue based on whether the command is a read command or a write command. The method further includes removing active commands from the plurality of second-level queues according to a second schedule. The method further includes issuing the active commands to a back end of the controller for processing.

Command load balancing for NVME dual port operations

A data storage device comprises a non-volatile semiconductor memory device and a solid-state drive controller communicatively coupled to the non-volatile semiconductor memory device, including a function level reset manager. The function level reset manager can receive a function level reset request from a host system, generate a function level reset bitmap based on the function level reset request, and broadcast the function level reset request to a command processing pipeline. The function level reset bitmap can indicate which functions are in a reset state. Further, the function level reset manager can determine which functions are in the reset state and instruct the command processing pipeline to cancel commands associated with the functions in the reset state.

Managing function level reset in an IO virtualization-enabled storage device

A method of managing memory descriptors for a plurality of commands to a non-volatile semiconductor storage device includes requesting memory descriptors from a host system for each of the plurality of commands stored in a first memory, storing the memory descriptors for each of the plurality of commands in free descriptor regions of a plurality of descriptor regions in a second memory of the non-volatile semiconductor storage device, and maintaining a dynamic descriptor list in the second memory for each of the plurality of commands, the dynamic descriptor list for each of the plurality of commands comprising occupied descriptor regions of the plurality of descriptor regions in the second memory having associated memory descriptors. At least one of the occupied descriptor regions includes multiple memory descriptors and a single pointer to a next occupied descriptor region of the plurality of descriptor regions.

Method and design for dynamic management of descriptors for SGL operation

In an example, a method of managing direct memory access (DMA) descriptors for commands to a non-volatile semiconductor storage device includes requesting DMA descriptors from the host system for each of a plurality of the commands stored in a command random access memory (RAM). The method further includes storing the DMA descriptors for each of the plurality of the commands in free descriptor regions in a descriptor RAM. The method further includes maintaining a dynamic descriptor list in the descriptor RAM for each of the plurality of commands, the dynamic descriptor list for each of the plurality of commands comprising occupied descriptor regions in the descriptor RAM having associated DMA descriptors.

In an example, a method of fetching direct memory access (DMA) descriptors for commands to a non-volatile semiconductor storage device includes storing the commands among a plurality of queues in a command random access memory (RAM). The method further includes processing one or more of the commands from the plurality of queues and issuing requests to read from or write into the non-volatile semiconductor storage device according to the processing. The method further includes fetching DMA descriptors from the host system for the processed commands according to a real-time fetch quota. The method further includes pre-fetching DMA descriptors from the host system for queued commands that are not being processed according to a pre-fetch quota. The method further includes storing fetched and pre-fetched DMA descriptors in a descriptor RAM.

Method for on-demand fetching of SGL pointers based buffer, traffic and command requirements

Various embodiments of the present invention provide systems and methods for data processing. Such data processing includes data shuffling.

Systems and methods for efficient data shuffling in a data processing system

A method for data sequence detection includes generating a first sample stream, equalizing the first sample stream to generate a first equalized sample stream, and buffering the first equalized sample stream. The first sample stream is interpolated to generate a second sample stream. The second sample stream is equalized to generate a second equalized sample stream. In a first processing path, the samples of the buffered first equalized sample stream are filtered using a first noise predictive filter bank to generate a first set of noise sample streams. In a second parallel processing path, the samples of the buffered first equalized sample stream are interpolated using a second interpolation filter to generate an interpolated sample stream and the interpolated sample stream is filtered to generate a second set of noise sample streams. The first equalized sample stream and the second equalized sample stream are processed to generate adapted filter coefficients for the second interpolation filter. The first and second set of noise sample streams are diversity combined to generate a set of combined noise sample streams. A data sequence is detected using the set of combined noise sample streams.

Data sequence detection in band-limited channels using two stream detector architecture

Various embodiments of the present inventions provide a symbol flipping LDPC decoding system. For example, a symbol flipping data processing system is disclosed that includes a low density parity check decoder operable to decode codewords and to identify unsatisfied parity checks, a symbol flipping controller operable to change values of at least one symbol in the codewords based on the unsatisfied parity checks to assist the low density parity check decoder to decode the codewords, a scheduler operable to control a decoding and symbol flipping mode in the low density parity check decoder and the symbol flipping controller, and a hard decision queue operable to store hard decisions for converged codewords from the low density parity check decoder.

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Sunnyvale, CA, United States of America

Sancar Kunt Olcay