Kabushiki Kaisha Toshiba

Toshiba Memory Corporation

Arata Miyamoto

Kenichi Maeda

Hiroto Nakai

Masahiro Ishiyama

Hiroshi Yao

Naomi Takeda

Daisuke Iwai

Yu Nakanishi

Tokumasa Hara

Kenichiro Yoshii

Shinya Murai

Hiroki Kudo

Kenta Yasufuku

Ryo Yamaki

Akira Yamaga

Naoaki Kokubun

Ikuo Magaki

Naoto Oshiyama

According to one embodiment, a storage unit, a management unit that acquires attributes of communication apparatuses from a plurality of the communication apparatuses and stores identifiers of the communication apparatuses and the attributes in the storage unit in association with each other as communication apparatus information, and a selection unit that selects a distributor apparatus that is the communication apparatus distributing a content to the other communication apparatuses as a radio signal based on the communication apparatus information are included.

Data processor, content distribution system, and communication apparatus

According to the embodiments, a communication apparatus stores therein an operation mode indicating whether the communication apparatus is a publisher or a subscriber, and includes a message processing unit that generates a transmission message and analyzes a reception message and a nonvolatile memory. When the communication apparatus is subscriber, the communication apparatus sends a repair message to request a retransmission of a data chunk not successively received. When the communication apparatus is publisher, the communication apparatus selectively retransmits the data chunk based on the repair message.

Communication apparatus and communication method

A mode of a publisher or a subscriber is stored. Also, a first identifier indicating affiliation to a first group is stored. In a case of the publisher, a transmission message including ToC information, which is a list of the first identifiers and data to be transmitted, is transmitted to an outside. In a case of the subscriber, when a received message includes the first identifier, data included in the message is stored into a non-volatile memory, and when it is determined that all data in the ToC information stored in the received message are already received and that the number of publishers is less than a threshold, the stored mode is changed to the publisher.

According to one embodiment, a memory system includes a bit-error-rate manager configured to manage information associated with a bit error rate for each physical block, a logical-block constructing unit configured to construct a logical block based on the information associated with the bit error rate, and a block manager configured to manage the correspondence between the logical block constructed by the logical-block constructing unit and the physical blocks. The logical block is a collection of a plurality of physical blocks.

Memory system and constructing method of logical block

According to the embodiments, when a communication apparatus is a publisher, a transmission message including a first identifier is transmitted using first transmission power, when the communication apparatus is a subscriber, data of a reception message including the first identifier is stored in a nonvolatile memory, when at least a part of the reception message cannot be received, a repair message for requesting retransmission of the reception message is transmitted from a wireless interface unit using second transmission power, and when there is no response, a repair message is transmitted using third transmission power that is larger than the second transmission power.

According to one embodiment, a virtual block is constructed according to configuration conditions that, when a plurality of physical blocks included in the virtual block are selected, the sum of the number of physical block pairs and the number of single blocks allocated from the same memory chip to one virtual block is less than or equal to a first value.

Memory system and constructing method of virtual block

According to an embodiment, a retention time of each block group is managed and a degree of wear of each block is managed. A free block allocated to each block group is determined based on the retention time of each block group and the degree of wear of each block.

Memory controller and memory system

A storage device according to an embodiment includes first and second non-volatile semiconductor memories. In addition, the storage device includes first controller that controls the first non-volatile memory to cause the first non-volatile memory to perform processes. In addition, the storage device includes second controller that controls the second non-volatile memory to cause the second non-volatile memory to perform processes. The storage device further includes a signal line which is connected to the first controller and the second controller and through which a token is transmitted between the first controller and the second controller. The first controller is capable of controlling the first non-volatile memory while holding the token and the second controller is capable of controlling the second non-volatile memory while holding the token.

Growing community of inventors

Ota-ku, Japan

Arata Miyamoto