基于RS422+LVDS高速长线通信的设计与实现  

Design and Implementation of High Speed Long Line Communication Based on RS422+LVDS

作　　者：李建翔 王洪凯 杨玉华[1] 刘东海[1] 李秋媛 LI Jian-xiang;WANG Hong-kai;YANG Yu-hua;LIU Dong-hai;LI Qiu-yuan(North University of China,Key Laboratory of Instrumentation Science and Dynamic Measurement of Ministry of Education,National Key Laboratory for Electronic Measurement Technology,Taiyuan 030051,China;Beijing Aerospace Long March Aircraft Research Institute,Beijing 100076,China)

机构地区：[1]中北大学,仪器科学与动态测试教育部重点实验室,电子测试国家重点实验室,山西太原030051 [2]北京航天长征飞行器研究所,北京100076

出　　处：《仪表技术与传感器》2021年第3期40-44,96,共6页Instrument Technique and Sensor

摘　　要：为了改善高速数据长距离传输时可靠性低的问题,文中提出了一种软硬件相结合的数据传输方案。该设计在指令下发和状态返回的电路中采用RS422接口电路,并选用ADM2682E磁隔离芯片,在保证可靠性的前提下极大简化电路;在数据传输中采用LVDS接口电路,选用SN65LV1023A串化器以及SN65LV1224B解串器,并配合驱动器和均衡器进行驱动和补偿,使得信号能够进行高速远距离传输。为了提高抗干扰性能,还在嵌入式软件的指令模块增加校验字环节,提高指令识别的可靠性;数据传输中采用半字节CRC校验的方法,降低误码率。经验证,此方案能够在90 m长的电缆中实现240 Mbit/s的零误码传输,稳定可靠,满足任务要求。In order to improve the problem of low reliability when high-speed data is transmitted over long distances,this scheme proposed a data transmission scheme combining software and hardware.This design adopted RS422 interface circuit in the circuit of command issuing and status return,and selected ADM2682E magnetic isolation chip,which greatly simplified the circuit on the premise of ensuring reliability.LVDS interface circuit was used in data transmission,SN65LV1023A serializer and SN65LV1224B deserializer were selected,and the driver and equalizer were used to drive and compensate,so that the signal can be transmitted at high speed and long distance.In order to improve the anti-interference performance,a check word link is also added to the instruction module of the embedded software.The method of nibble CRC check was used in data transmission to reduce the bit error rate.After verification,this solution can achieve 240 Mbit/s zero error transmission in a 90 meter cable,which is stable and reliable,and meets the task requirements.

关 键 词：FPGA RS422串行接口 低电压差分信号 半字节循环冗余校验 校验字 

分 类 号：TN919[电子电信—通信与信息系统]