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。
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。
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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