本文主要介绍嵌入式系统硬件平台的选型原则，并着重对ARM处理器的选型进行分析与比较，同时给出实例进行验证。
In the paper, it induces the principle of how to choose types of embedded system hardware platform, and mainly compare and analyze different types of ARM processor. It gives example to test.
文中以一套掌上电脑开发平台的USB主机控制器为实例，分析了嵌入式系统中usb主机控制器的设计与实现。
In this paper, a handheld computer development platform is used as an example to analyze the design and implementation of the USB host subsystem.
文中以一套掌上电脑开发平台的USB主机控制器为实例，分析了嵌入式系统中usb主机控制器的设计与实现。
In this paper, a handheld computer development platform is used as an example to analyze the design and implementation of the USB host subsystem.
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