Fujitsu Corporation

Atsushi Uchida

Yoko Kawano

Terumasa Haneda

Yuji Hanaoka

Hayato Minamishin

Yuji Tanaka

Atsunori Kimura

Isamu Esaki

Hidekazu Hata

Hiroyuki Ueda

Seiichi Ohno

Yoichi Ono

Emi Cho

Emi Narita

Hidenori Takahashi

Nina Tsukamoto

Toshihiko Suzuki

Toshihiro Tomozaki

Hirotoshi Inoue

Mitsuyuki Mizuno

Ayumi Yamada

Seiichi Fujitsu Limited Ohno

Isamu Fujitsu Kiden Limited Esaki

Yuji Fujitsu Limited Tanaka

Hidekazu Fujitsu Limited Hata

Hayato Fujitsu Limited Minamishin

Atsunori Fujitsu Limited Kimura

Hiroyuki Fujitsu Kiden Limited Ueda

Yoichi Fujitsu Limited Ono

A control apparatus that causes data in a first storage unit to be written in a second storage unit, with power supplied from a sub power supply, when supply of power from a main power supply is discontinued, the control apparatus includes a remaining feed duration obtaining unit that obtains remaining feed duration during which the sub power supply can supply the power; and a retry count setting unit that sets a maximum retry count for writing the data from the first storage unit to the second storage unit, based on the remaining feed duration obtained by the remaining feed duration obtaining unit, when an error occurs while the data is being written.

Control apparatus, computer-readable storage medium, and information processing apparatus

A write DMA includes a write unit, a read unit and a parity generation unit. The read unit reads parity data from one of two NAND flashes storing the parity data therein. The parity generation unit generates parity data based on the read parity data and a plurality of stripes obtained by dividing user data. The write unit writes a stripe into any of a plurality of NAND flashes storing stripes therein, and writes generated parity data into the other NAND flash from which parity data is not read.

Storage device and method for controlling storage device

A storage apparatus includes a storage medium configured to store data and a control unit configured to control access to the storage medium. The control unit includes first storage configured to store data to be stored in the storage medium, a second storage configured to store data, a control information generator configured to generate control information indicating a storage state of the data in the first storage and a transfer controller configured to control transfer of the data stored in the first storage to the second storage on the basis of the control information generated by the control information generator when the supply of power to the control unit is stopped.

Storage apparatus and controlling method for data transmission based on control information

A control apparatus includes a capacitor to store electric power supplied from the power supply unit and to supply the stored electric power to the control apparatus when the power supply from the power supply unit is stopped, a first nonvolatile memory, a second nonvolatile memory, a first controller, and a second controller. The first controller writes the data, stored in the cache memory, into the first nonvolatile memory when the external power supply is stopped verifies whether the data stored in the first nonvolatile memory is normal, and sends information of area where the data in the first nonvolatile memory is not normal when the verification indicates that the writing is not normal. And the second controller writes the information sent from the first controller into the second nonvolatile memory.

Control apparatus and control method

An access control apparatus for controlling an access to a storage device, the access control apparatus includes a measuring unit configured to measure the time to erase data stored in the storage device, and a determination unit configured to determine a data size of an error correcting code added to data stored in the storage device in accordance with the time measured by the measuring unit. The access control apparatus includes a generation unit configured to generate the error correcting code having the data size determined by the determination unit, and an access controller configured to write the data and the error correcting code generated by the generation unit into the storage device.

Access control apparatus, storage apparatus, and method

A non-volatile semiconductor memory device includes: a memory unit including a plurality of memory cells, each of the plurality of memory cells to perform a multi-level storage operation by assigning a value including a plurality of bits to at least four data states defined according to a threshold level; and a controller to control the memory unit, wherein the controller sets at least one of the plurality of bits to an error correction bit that indicates one of a first state and a second state; assigns the first state to the error correction bits that correspond to the data states having a minimum threshold level and a maximum threshold level and the second state to the error correction bits that correspond to the data state having other threshold level; and resets the error correction bit to the first state when the error correction bit indicates the second state.

Non-volatile semiconductor memory device performing multi-level storage operation

A control device including: a storage device that includes a first storage area including a plurality of blocks into which data can be written more than once and a second storage area into which data can be written only once, wherein the first storage area further stores a flag for each of the blocks, the flag indicating whether or not the block is allowed to be used; a flag management information creation unit configured to create, on the basis of the flag, a flag management information for managing whether or not data can be stored in each block of the storage device; and a management information controller configured to cause the flag management information to be stored in the second storage area.

Control device, controller module, and control method

An information processing apparatus includes, a first storage unit, a second storage unit in which data stored in the first storage unit is backed up, and a memory controller that controls data backup operation. The memory controller divides a transfer source storage area into portions, and provides two transfer destination areas, each of the two transfer destination areas being divided into portions, backs up data in a direction from a beginning address of each divided area of the transfer source storage area to an end address thereof in one of the transfer destination areas provided for each divided area of the transfer source storage area, and backs up data in a direction from the end address of each divided area of the transfer source storage area to the beginning address thereof in the other transfer destination storage area.

Data backup method and information processing apparatus

A storage apparatus includes a backup processing unit that stores data stored in a first memory into a second memory as backup data upon occurrence of a power failure, a restore processing unit that upon recovery from the power failure restores the backup data backed up in the second memory to the first memory and erases the backup data, and an erasure processing termination unit that terminates the erasure processing upon a power failure occurring during erasure processing for erasing the backup data stored in the second memory, and a re-backup processing unit that re-backs up data in the first memory corresponding to the backup data erased from the second memory before the erasure processing is terminated by the erasure processing termination unit to a location in the second memory subsequent to a last location that contains the backup data which has not been erased.

Storage apparatus and method of data processing

An asynchronous interface circuit for transferring a data stream between different clock domains, the asynchronous interface circuits includes a data holding circuit for sequentially receiving and transferring data of the data stream in synchronism with a first clock signal, and holding the received data until an input of a next data, an asynchronous memory for sequentially receiving the data held in the data holding circuit in synchronism with the first clock signal and for outputting the data in the order of inputting in synchronism with a second clock signal. The asynchronous interface circuit further includes a monitor for detecting an operating state of the asynchronous memory, and a selector for selecting one of the data output from the asynchronous memory and the data output from the data holding circuit on the basis of a detecting result of the monitor.

Asynchronous interface circuit and data transfer method

A circuit system has a first and a second circuit sub-system, and a bidirectional bus, the first circuit sub-system having a first control circuit that receives a control signal for controlling the direction of the bidirectional bus, and controls the first sub-system to be either of a transmitting or a receiving state based on a state of the control signal, a first sending unit that receives the control signal, and outputs as a first control signal, and a second sending unit that receives the control signal, and outputs as a second control signal, the second circuit sub-system having a first receiving unit that receives the first control signal, a second receiving unit that receives the second control signal, and a second control circuit that controls the second sub-system to assume either the transmitting or the receiving state on the basis of the first and the second control signal.

Circuit system including first circuit sub-system, second circuit sub-system and bidirectional bus, circuit sub-system and method

Disclosed is a multi-processor system causing no distribution loss of resources and having no defect inherent in a prior art concentrated management type system. The multi-processor system (e.g., a switching system) includes a plurality of processors each incorporating a function of managing a part (distributed resources) of all the resources, trying to grasp, when the resource is needed, at first this resource from the distributed resources managed by the processor itself and, if unable to grasp the resource, requesting other processor to grasp the resource needed.

Multi-processor system

A paper sheet manipulating apparatus and a paper sheet transaction apparatus for manipulating paper sheets such as bills has an inlet/outlet port allowing input and output of paper sheets and rotating between the paper sheets inlet position and the paper sheet feeding position; a separating device projected to the outlet port and drawn back to the draw-back position, distinguished, when projected, the paper sheets inputted to the inlet port and the paper sheets to be returned and accommodate the paper sheets into the outlet port; an accommodation section for accommodating the paper sheets; a temporary storing section for temporarily storing the paper sheets which should not be accommodated in the accommodation section or should not be exhausted and a plurality of cassettes for feeding and collecting the paper sheets in the accommodation section and for feeding and collecting the paper sheets in the outlet port, whereby few faults are generated and manipulations can be continued at a high speed for a long period of time without any pause even if a fault is generated.

Paper sheet manipulating apparatus and paper sheet transaction apparatus

A paper sheet manipulating apparatus and a paper sheet transaction apparatus for manipulating paper sheets such as bills includes an inlet/outlet port allowing input and output of paper sheets and rotating between the paper sheets inlet position and the paper sheet feeding position; a separating means projected to the outlet port and drawn back to the draw-back position, distinguish, when projected, the paper sheets inputted to the inlet port and the paper sheets to be returned and accommodate the paper sheets into the outlet port; an accommodation section for accommodating the paper sheets; a temporary storing section for temporarily storing the paper sheets which should not be accommodated in the accommodation section or should not be exhausted and a plurality of cassettes for feeding and collecting the paper sheets in the accommodation section and for feeding and collecting the paper sheets in the outlet port, whereby a fault is little generated and manipulations can be continued at a high speed for a long period of time without any pause even if a fault is generated.

Growing community of inventors

Kawasaki, Japan

Atsushi Uchida