Below the protocols layer is another agnostic interface layer that connects protocols to a variety of hardware device drivers with varying capabilities.

协议层下面是另外一个无关接口层，它将协议与具有很多各种不同功能的硬件设备连接在一起。

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Each LLD provides the interface to the particular underlying hardware but USES the standard set of interfaces to the mid layer.

每个LLD都提供了到特定底层硬件的接口，但所使用的到中间层的接口却是一组标准接口。

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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。

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