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。
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