基于PXI的LVDS高速通信板卡设计

Design of LVDS High Speed Communication Board Based on PXI

针对采集系统与计算机的高速数据传输问题,设计了基于PXI接口的通信板卡。板卡以FPGA为控制核心,控制LVDS进行数据采集,将数据通过PXI接口发送给计算机,通过WDM驱动结构完成PXI总线连接到计算机的软件接口,并编写上位机程序对板卡进行测速。不同于传统数据采集卡,没有采用专用的PCI芯片,单独以FPGA来实现PXI接口。测试证明,设计的通信板卡可以实现高速数据采集功能,速度可达107 MB/s,在节约成本的同时加快了PXI板卡的开发周期。

A communication board based on PXI interface was designed to solve the problem of high⁃speed data transmission between acquisition system and computer.The board took FPGA as the control core,controlled LVDS for data collection,sent data to the computer through PXI interface,completed the software interface connecting PXI bus to the computer through WDM driver structure,and wrote the upper computer program to measure the board speed.Different from the traditional data acquisition card,PXI interface was implemented by FPGA instead of special PCI chip.The test proves that the high⁃speed data acquisition function can be realized with the speed up to 107 MB/s,which not only saves the cost but also speeds up the development cycle of PXI board card.