Kabushiki Kaisha Toshiba

Toshiba Memory Corporation

Wataru Okamoto

Kosuke Hatsuda

Hidenori Matsuzaki

Junji Yano

Katsuhiko Ueki

Hironobu Miyamoto

Yoko Masuo

Humitaka Tamura

Masayuki Hirayama

Ryoichi Kato

A power supply management device includes a first input terminal that receives an input voltage, and a first power supply circuit that outputs a voltage obtained by converting the input voltage. The first power supply circuit further outputs a first voltage responsive to a first signal being received by the first input terminal. The first power supply circuit yet further outputs a second voltage responsive to a second signal different from the first signal being received by the first input terminal.

Power supply management device and memory system

A memory system includes a nonvolatile semiconductor memory having blocks, the block being data erasing unit; and a controller configured to execute; an update processing for; writing superseding data in a block, the superseding data being treated as valid data; and invalidating superseded data having the same logical address as the superseding data, the superseded data being treated as invalid data; and a compaction processing for; retrieving blocks having invalid data using a management table, the management table managing blocks in a linked list format for each number of valid data included in the block; selecting a compaction source block having at least one valid data from the retrieved blocks; copying a plurality of valid data included in the compaction source blocks into a compaction target block; invalidating the plurality of valid data in the compaction source blocks; and releasing the compaction source blocks in which all data are invalidated.

Memory system and method for controlling a nonvolatile semiconductor memory

A memory system includes a nonvolatile semiconductor memory having blocks, the block being data erasing unit; and a controller configured to execute; an update processing for; writing superseding data in a block, the superseding data being treated as valid data; and invalidating superseded data having the same logical address as the superseding data, the superseded data being treated as invalid data; and a compaction processing for; retrieving blocks having invalid data using a management tablet the management table managing blocks in a linked list format for each number of valid data included in the block; selecting a compaction source block having at least one valid data from the retrieved blocks; copying a plurality of valid data included in the compaction source blocks into a compaction target block; invalidating the plurality of valid data in the compaction source blocks; and releasing the compaction source blocks in which all data are invalidated.

According to one embodiment, a valid-cluster search module searches valid clusters included in first blocks, in each of channels, for compaction. A read command generator generates read commands used to read, in parallel, valid clusters to be migrated to a second block. The valid clusters searched in each of the channels comprise the valid clusters to be migrated. The valid clusters to be migrated correspond to a number of clusters simultaneously written to the second block and to a second number of channels in a first number of channels. A determination module determines the second number of channels corresponding to read commands to be generated next based on a situation of issuance of the read commands.

Memory system having multiple channels and method of generating read commands for compaction in memory system

According to one embodiment, a storage controller includes a condition storage, a determination module, a wear-leveling block retainer, and a data transfer controller. The condition storage is provided in a storage including a plurality of blocks, and stores block condition information including at least one of erasure time information indicating when data is erased last time and erasure count information indicating the number of times data is erased. The determination module determines whether there is a block that requires wear leveling based on the block condition information. The wear-leveling block retainer retains block identification information that identifies a block determined to require wear leveling. The data transfer controller performs compaction to transfer data stored in blocks of the storage for collecting the data in a block, and, when the block identification information is retained, transfers data stored in the block identified by the block identification information.

Storage controller for wear-leveling and compaction and method of controlling thereof

A system includes: a first input buffer that functions as an input buffer for a third storing area; and a second input buffer that functions as an input buffer for the third storing area and that separately stores data with a high update frequency for the third storing area. In the system, a plurality of data written in a first storing area or a second storing area are flushed to the first input buffer in units of logical blocks. Also, a plurality of data written in the first input buffer are relocated to the third storing area in units of logical blocks.

Memory system for flushing and relocating data

A log in which a series of events occurred as a result of the execution of the target program has been recorded is inputted. A plurality of partial logs are created from the inputted log. These partial logs are normalized on the basis of the master log serving as a normalization reference. The feature value representing the degree of feature of the occurrence and nonoccurrence of an event is calculated for each of the normalized logs on the basis of the normalized logs for the remaining partial logs. In a combination of a specific partial log and another partial log, the similarity between these partial logs is calculated by performing an operation on the basis of the feature values. For example, a combination of the specific partial log and the partial log with the highest similarity is displayed.

Computer system and method for aiding log base debugging

An object state classification method includes a step of designating a to-be-determined object that is to be determined, and a state of the to-be-determined object, a step of creating a method set including, as elements, methods called from the designated state of the to-be-determined object, a step of using, as a to-be-determined state, the designated state of the to-be-determined object or another state obtained by calling methods from the designated state, and executing a program for calling methods included in the method set from the to-be-determined state, a step of recording an execution result in a case of calling the methods, and a step of creating a pseudo-state by merging a method group that is the elements of the method set, and the execution result in the case of calling each method of the method group, in association with the to-be-determined state of the to-be-determined object.

Object state classification method and system, and program therefor

One of log analysis methods of the present invention includes the step of executing a program a plurality of times; executing a program a plurality of times; the step of generating a plurality of logs, each log being recorded a plurality of events occurring upon the execution of the program according to an occurrence order of each of the events in each of the logs; the step of performing a first calculation to calculate an event occurrence probability, for the occurrence order of each event, based on at least one from the program description concerning each event recorded in the logs and the data to be used upon the execution of the program description; and the step of outputting information concerning an event which corresponds to a characteristic included in the logs, based on the event occurrence probability.

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Kanagawa, Japan

Wataru Okamoto