为满足工业生产中对现场总线柔性可重构以及高速实时传输要求,讨论了一种可在线配置高速实时总线的设计与实现.本研究通过对SPI协议的改进,使其适应进行长距离传输的全双工通信,以保证传输速度和实时要求.通过现场可编程门阵列(field programmable gate array,FPGA)技术的应用和报文结构的特殊设计,实现了总线数据报文长度的在线柔性配置和从模块的智能扩展.文中给出的工程应用实例证明了此方法的可行性. In order to meet the requirements of field reconfigurable flexible bus and high speed real-time transmission in industrial production, a design and implementation of high-speed real-time bus can be configured online.In this study, Full-duplex communication to ensure the transmission speed and real-time requirements.Through the field programmable gate array (field programmable gate array, FPGA) technology and the special design of the message structure, the bus data packet length online flexible configuration and From the module’s intelligent expansion, the engineering application example given in this paper proves the feasibility of this method.