Fujitsu Corporation

Yasuo Ishiwata

Sadayuki Ohyama

Osamu Kezuka

Masaru Sakurai

Kazuho Kitazawa

A communication control method is provided for an encryption processing unit connected to a connection status acquiring unit which is connected to a circuit that transmits packets on a network and acquires the status of a connection to a network for an encrypting device for encrypting the packet, and connected to an expansion card for connecting to the network, based on the network connection status requested and acquired from the connection status acquiring unit by the expansion card each prescribed period of time, by relaying and acquiring the network connection status from the connection status acquiring unit and forcibly notifying the expansion card that the connection status is connected and/or not connected, according to a requirement/criteria.

Communication control method and communication control unit controlling network connection status among communication units

A PCI bridge circuit connects to first and second PCI buses and performs data transfer between PCI devices. The PCI bridge circuit has a data buffer and controller and the controller, prior to the establishment of a data transfer state with the first PCI device via the first PCI bus, receives data from the second PCI device via the second PCI bus into a data buffer and inserts a wait state. Consequently while reducing the capacity of the data buffer, data transfer between PCI devices can be performed without affecting the transfer performance.

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Kahoku, Japan

Yasuo Ishiwata