Mitsubishi Denki Kabushiki Kaisha

Shinichiro Chino

Kenji Suzuki

Satoru Nakai

Yuusuke Ushio

Tadashi Yoshimoto

A controller controls a time stamp providing unit to provide a periodic transfer packet with a time stamp showing the synchronous timing of periodic control designated by the control period timer using the global time indicated by a global timer. Devices are corrected to synchronize operation period timers with the periodic control, by using the time difference between the synchronous timing time of periodic control indicated by the time stamp of the transmitted periodic transfer packet and the global time indicated by global timers, at periodic operation timing of the operation period timers.

Periodic control synchronous system

Transmission delay in a serial bus connected network is determined by transmitting a Ping packet which is replied to in a physical layer of the bus from a request node to a response node, and measuring the time required from transmission of Ping packet by the request node until a SelfID packet corresponding to the Ping packet is returned to the request node. The delay deviation between cycle timers of the request node and the response node is compensated by this transmission delay. The delay deviation may be also compensated using a time stamp.

Synchronizing system using IEEE 1394 serial bus standard

A computer system having a bus connection and disconnection unit for connecting and disconnecting an ISA bus to and from a slave bus, the ISA bus being connected to a main processor. The slave bus is connected with a bus master. When accessing a device on the slave bus, the bus master requests the bus connection and disconnection unit to disconnect ISA bus from the slave bus. This allows the main processor to perform other processing without getting put on hold.

Growing community of inventors

Tokyo, Japan

Shinichiro Chino