Fujitsu Corporation

Fujitsu Semiconductor Limited

Spansion Llc.

Nobuhiro Taki

Hirotaka Ueno

Masato Tomita

Hideo Makabe

A communication device including a comparison unit that compares a first identification number of which notification is provided by a packet that sequentially assigns identification numbers to a plurality of nodes in a network, and a second identification number, which is assigned to the communication device. A control unit notifies other nodes of the second identification number and that the identification number of the communication device has not been changed when the first identification number and the second identification number are in non-conformance.

Communication network device that compares first and second identification number of packet to determine if they are in conformance or non-conformance with self-ID packet

A packet communication device for communicating a packet to be transferred in constant cycle, comprising one of a logic inversion section configured to invert a logical value with respect to at least one bit included in a first string of bits included in a first packet; and a register section configured to store another string of bits having a logical value different from a given logical value of the first string of bits; and a selector section configured to select one of the first string of bits and a second string of bits that is output from one of the logic inversion section and the register section to designate any one of a plurality of devices, wherein the packet communication is performed when a selected string of bits selected by the selector section conforms to a setting value of a receiving side.

Packet communication device for communicating packet to be transferred through packet communication which is time-managed in constant cycle and packet communication method thereof

A method of data transmission that includes: transmitting first data to be transferred in a synchronous packet using a second asynchronous packet having priority higher than that of a first asynchronous packet; and requesting transmission of second data following the first data using the second asynchronous packet after a lapse of a certain time from the transmission of the second asynchronous packet.

Method of data transmission, data transmitting apparatus, and network system

A method for transmitting a packet including a packet data fragment and packet information with a transmission device, the method includes determining a concatenated quantity of packets based on size of the packet data fragment, generating a concatenated packet including packet data fragments corresponding to a plurality of first packets, wherein a number of the packet data fragments is determined based on the concatenated quantity, and packet information corresponding to the first packets, and transmitting the concatenated packet in any one of a plurality of communication cycles.

Method and device for transmitting packets

There is provided an IEEE 1394 transmitter for transmitting a plurality of audio data contents, having an audio data generator configured to sample the plurality of audio data contents sequentially to generate format data of an audio data content; and an IEEE 1394 transmission controller configured to add an IEEE 1394 header packet to the format data of the audio data content.

IEEE 1394 transmitter, IEEE 1394 receiver and audio data content transmission method

Disclosed is a serial bus interface device having a physical layer circuit capable of also simulating a plurality of devices without exerting an influence on a topology when the device is connected to a serial bus such as an IEEE 1394 serial bus. When a bus analyzer of the invention is inserted between a personal computer having the ID of 1 and a digital camera having the ID of 0 in order to analyze data on the IEEE 1394 serial bus to which the personal computer and the digital camera are connected, the bus analyzer interfaces with buses without being given an ID by the physical layer circuit, and analyzes the states of the buses without changing the state of the system to be analyzed and without changing the IDs of the personal computer and the digital camera.

Serial bus interface device

A connection device for connecting electronic devices via a network allows activates its status signal in response to a data transfer operation or in response to receiving a remote status signal. By limiting the activation of the status signal, the connection device reduces the power consumption of the electronic devices. The connection device also performs plug-and-play initialization to prevent device conflicts and allow for hot plug-in of electronic devices.

Apparatus and method for controlling device connection

An apparatus for processing transfer data to be transferred in synchronism with one of an external write signal and an external read signal, includes a plurality of memories for storing the transfer data. A plurality of sync signal generators are provided in association with the memories, to generate one of a sync write signal and a sync read signal, which determine write and read timings for the memories, in response to one of the external write signal and the external read signal and an internal clock having a longer period than the one of said external write signal and the external read signal. A distribution circuit is connected to the plurality of sync signal generators, for receiving one of the external write signal and the external read signal and sequentially distributing the one of the external write signal and the external read signal to the sync signal generators. A plurality of address control circuits, are respectively connected between the memories and the sync signal generators, to control the memories in such a way as to write and read the transfer data into and from the memories in synchronism with one of the sync write signal and the sync read signal.

Method and apparatus for fast data transfer using internal clock of

A protocol control circuit for transferring data conforms to the IEEE 1394 standard. The control circuit includes a decoder and RS-type flip-flops.

Growing community of inventors

Kasugai, Japan

Nobuhiro Taki