In the system, the upper layer application software for the USB embedded host in household entertainment products is designed and implemented based on USB Protocol, by resolution of DVD.

系统在usb协议基础上，以DVD解决方案为依托，实现嵌入式usb主机系统在家庭娱乐消费产品中的应用软件设计与实现。

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USB protocol layer describes the grammar and protocol used in the communication of USB host with USB devices, and presents the USB hierarchy consisting of fields, packets, transactions and transfers.

US B协议层描述了USB主机与usb设备交互时的语法和协议，从中定义了字段、包、事务和传送的结构，以及由字段到包、由包到事务、由事务到传送所组成的组织层次关系。

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The protocol of USB Host Controller is analysed and the application of USB technique to intelligent instruments are introduced.

本文研究了US B主控制器协议，并分析了USB技术应用于智能仪表的技术可行性。

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