总线控制器作为管理计算机与现场总线的接口装置，起到了管理计算机与智能仪表数据双向传输的网桥作用。

As a network bridge, communication controller is the interface device which realize the function of communication between supervise PC and field bus.

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以数据库加密装置的PCI接口驱动开发为背景，研究了PCI的总线特点、控制机制、接口规范及接口设计方式。

After the PCI bus features, control mechanism, interface specification and interface design pattern is studied, we expatiate the driver specialty in Linux.

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