Importance

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Abstract

A device controller is used for controlling PCI devices or card devices on an add-inboard. To install multiple devices including a master device on the add-in board, and to build a multifunction PCI device or card device by smoothly controlling their operation, a device controller (1) is provided with a bus arbiter circuit (17) for handling bus mastering request from devices (D1-D8). The device controller causes the bus arbiter circuit (17) and a target detect circuit (16) to detect an initiator and a target, and a bus sequencer (2) to control signal issuing operation in a bus mastering cycle, for example, by an appropriate procedure based on the result of the detecting operation. An add-in board (30) is recognized as a single multifunction device.

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First Claim