Fujitsu Corporation

Fujitsu Semiconductor Limited

Hiroyuki Komori

Takashi Nakajima

Yukio Suda

Masayuki Suzuki

Yuya Tagami

Akio Yokotsuka

A transmission device includes: a reception circuit; and a transmission section that is disposed between the reception circuit and a transmission circuit and transmits a clock signal and data signals in parallel, wherein the transmission circuit performs operations of: inserting a predetermined pattern in a data invalid period of each of the data signals; outputting the each of the data signals in which the predetermined pattern has been inserted in synchronization with an input clock; and adjusting a phase of the clock signal in the data invalid period, the reception circuit performs operations of: detecting a state of a reception clock using the data signals in which the predetermined pattern has been inserted; and determining whether phase adjustment of the clock signal is to be performed, based on the state of the reception clock, and the transmission circuit adjusts the phase of the clock signal, based on a determination result.

Transmission device and signal processing method

A client interface unit receives a pause frame transmitted from a client device compatible with a relatively low communication rate. A data rate conversion unit generates a plurality of pause frames in accordance with a pause time designated by the received one pause frame and transmits the plurality of pause frames to a frame processing unit compatible with a relatively high communication rate. The frame processing unit stops transmitting a frame destined to the client device in accordance with the plurality of pause frames.

Transmission device and pause frame conversion method

A file system includes: a data controller that inverts logic of input data to convert the input data into accumulation data; a nonvolatile storage that has storage areas in which the accumulation data is stored and a table section to which use states of the storage areas are written; and a controller that controls the nonvolatile storage so as to store the accumulation data in the storage areas in accordance with the use states written to the table section.

File system and data management method

A file management device for a control system, has a file write unit which records data of a file into cluster areas of a recording medium, records file information into a directory area of recording medium, and records FAT chain information into FAT of recording medium; a file delete unit which stores file restoration information having the file information and FAT chain information into a memory area, sends back a restoration descriptor for identifying the file restoration information to control system, and deletes the file information and FAT chain information in recording medium; and a file restoration unit which reads data of deleted file from the recording medium based on the file restoration information and sends the data back to control system, and restores the file information and FAT chain information in the recording medium based on the file restoration information of the file selected by the control system.

Growing community of inventors

Kawasaki, Japan

Hiroyuki Komori