The function of serial communication port in protocol tester was analyzed and a programmable multi-protocol serial communication interface circuit was designed.
分析了网络协议测试仪的串行通信接口功能，设计了一种可编程多协议串行接口电路。
The hardware structure is introduced, emphatically the communication interface circuit. The time sequence logic problem between CAN controller chip SJA1000 and AT91RM9200 is solved using the CPLD.
介绍了新型通信控制器的硬件设计，着重描述了通信接口部分，用复杂可编程逻辑器件CPLD解决了CAN 控制器芯片SJA 1000与AT 91RM 9200之间的时序逻辑问题。
It has characteristics of simple circuit, needing few interface lines, high reliability and can perform duplex communication at high speed.
其特点是电路简单、占用口线少、速率高、可靠，可实现全双工通信。
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