The introduction of the USB system and OHCI standard.

介绍usb的体系结构和特点以及OHCI标准。

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The basic functionality of USB OHCI root hub is the foundation of the root hub design.

USBOHCI根集线器的基本功能是根集线器设计的基础。

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USB host controllers follow one of two standards: UHCI (Universal host controller Interface) or OHCI (Open host controller Interface).

usb主机控制器遵循两个标准之一：UHCI(通用主机控制器接口)或OHCI(开放式主机控制器接口)。

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USB host controllers follow one of two standards: UHCI (Universal host controller Interface) or OHCI (Open host controller Interface).

usb主机控制器遵循两个标准之一：UHCI(通用主机控制器接口)或OHCI(开放式主机控制器接口)。

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