用于虚拟仪器的USB2·0接口高速数据采集卡的设计  

Design of High-speed Data Acquisition Card with USB2.0 Interface Used in Virtual Instrument

作　　者：程耀林[1] 李享元[1] 何湘竹[1] 

机构地区：[1]中南民族大学电信学院,湖北武汉430074

出　　处：《计算机测量与控制》2011年第5期1220-1222,1256,共4页Computer Measurement &Control

基　　金：中南民族大学校基金资助项目(YZY07003)

摘　　要：提出了一种用于虚拟仪器的USB2.0接口高速数据采集卡的设计。针对USB2.0高速模式实现难的问题,分析了高速数据路径上的所有瓶颈及其解决方法,提出了系统的同步设计方法。选择ADS5232作为高速A/D芯片,CY7C68013作为USB2.0接口芯片,充分利用了该芯片提供的高速模式、自动工作模式和Slave FIFO端口模式,使用FPGA作为所有模块的控制器,CPU不参与数据处理,只用于寄存器初始化,从而实现高速采样和高速传输。软件部份分析了固件程序,驱动程序和主机应用程序的功能特性以及采集卡和Labview开发工具的接口问题。硬件测试的USB2.0接口的净荷平均速率达到149.6 Mbps,表明高速模式的采集卡是可以实现的。Design of high-speed data acquisition card with USB2.0 interface used in virtual instrument was put forwarded.The all data bottlenecks on the high-speed data path were analyzed and its solutions were provided for the problem about USB2.0 high-speed mode realization difficulty,and the system synchronization design method was put forwarded too.ADS5232 was selected as high-speed A/D chip,CY7C68013 was selected as USB2.0 interface chip,and its high-speed mode,Auto-in/Auto-out modes and Slave FIFO port mode were used adequately,FPGA device was selected as controllers of all modules,and CPU did not participate in data processing,only initialized registers,and sequentially it could implement high-speed processing and high-speed transmission.Software part analyzed functions and characteristics of firmware,driver and host applications,and the interface between the data acquisition card and LabVIEW development tool was analyzed too.The results of hardware testing indicates that the average speed of payload reached 149.6 Mbps,and the data acquisition card to support USB2.0 high-speed mode can be realized.

关 键 词：USB2.0高速模式 自动模式 数据瓶颈 同步设计 

分 类 号：TP334.22[自动化与计算机技术—计算机系统结构]