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)。
The paper presents the interface specification of USB host controller based on UHCI, analyzes the implementation of hardware layer in USB stack.
介绍基于UHCI的USB主机系统的硬件核心主机控制器接口规范，分析US B协议栈的硬件层实现。
When some microprocessors working with USB equipments in embedded systems without their own USB controller, their USB interface must be expanded.
对于多款微处理器本身没有USB的控制器，为了在嵌入式系统中使用USB设备，需要自行扩展usb接口。
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