一种透明传输的双向SPI接口的设计与实现  

Design and Realization of Two-way Transparent Transmission SPI Interface

作　　者：任宇飞[1] 张相[1] 程乃平[1] 

机构地区：[1]装备指挥技术学院光电装备系,北京101416

出　　处：《电讯技术》2009年第2期51-54,共4页Telecommunication Engineering

摘　　要：在高速图像/指令扩频无线传输系统中,前向链路主要为遥控指令或者遥控数据(例如航迹),后向链路主要为高速图像数据,无线传输信道为实时双向链路。针对这种前后向链路数据量不对称而又需要实时传输的特点,设计了一种新型的SPI接口,从而较好地解决了此类数据不对称信道中的数据实时双向透明传输的问题。该设计基于FPGA实现,可与绝大多数具有SPI接口的MCU(MPU)主设备进行双向SPI透明传输,而不需要增加任何协议。给出了SPI接口的仿真波形和实现结果,设计完成后经测试证明,该接口完全满足SPI协议串行数据传输的要求,性能可靠。In spread spectrum transmission over radio （ TOR ） system of high speed image/instruction, the forward chain is used mostly for command or data of remote-control while the backward chain is used for high speed data of image. The channel of TOR is two-way chain of real time. To cope with such asymmetric chain data rates of forwards and backwards for real time transmission, a new interface of SPI is designed basesd on FPGA to realize the interface of SPI, and it can realize two-way SPI transparent transmission with most MCUs （ MPUs ） which have SPI interface without any additional protocol. The wave form of simulation and the result of realization are given. The interface is proved to be reliable and completely satisfy the requirement of serial data transmission of SPI protocol.

关 键 词：无线传输系统 扩频 双向透明传输 串行外围接口 FPGA 

分 类 号：TN871[电子电信—信息与通信工程]