本文简要介绍了USB2.0协议层的通信原理，描述了USB2.0主机端控制器核心部分的划分、设计及实现。

This paper introduced the communication principle of USB2.0' protocol layer and the division, design and realization of the core part of USB2.0' host port controller.

youdao

我想说的是，那些编写自己的云控制器，并且过去没有编写过具有核心竞争力的产品的公司更容易出问题。

Suffice to say that those who write their own cloud controllers, and haven't a history in writing software as a core competency tend to be more buggy.

youdao

小组件的核心内容是控制器。

The central piece of the widget is the controller.

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