In the aspects of software modularization, emphasize to analyze USB device firmware, driver program of computer operating system and interface program-three parts of programming method.

在针对软件的模块化方面，着重分析了USB外设端的固件、主机操作系统上的客户驱动程序以及操作界面程序三个部分程序编写方法。

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Class Code the Class Code register is read-only and is used to identify the generic function of the device and, in some cases, a specific register-level programming interface.

本寄存器是只读的，被用来标识该设备类属的功能，而且在有些情况下，是一个寄存器级的编程接口。

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Each device class defines a set of semantics and a programming interface that devices of that class adhere to.

一个设备类用来描述一个类型的设备，想声音和网络设备。下面的设备类已经被系统确定。

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