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.
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。
The forth part is about CAN bus network application layer protocol, which was invented independently, with the support of the SJA1000 bus controller.
第四部分主要介绍在SJA1000总线控制器支持下的，独立自主开发的CAN总线应用层协议。
The forth part is about CAN bus network application layer protocol, which was invented independently, with the support of the SJA1000 bus controller.
第四部分主要介绍在SJA1000总线控制器支持下的，独立自主开发的CAN总线应用层协议。
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