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

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。

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After analyzing the USB Device Controller function requirements, the thesis divides the system into several sub-modules by the way of TOP-DOWN.

在对usb设备控制器的功能进行详细的分析后，采用自顶向下的方法划分系统模块。

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