基于FPGA的IEEE488接口协议实现及驱动程序开发

Implementation of IEEE488 Interface Protocol and Driver Development Based on FPGA

IEEE488作为一种通用的并行总线,凭借其低延时、可靠传输等优势,广泛应用于仪器控制与测试系统中;针对目前符合IEEE488接口协议的专用GPIB芯片如NAT9914、uPD7210、MC68488等都已停产,且在售GPIB控制器产品类型少且价格十分昂贵,难以满足国内市场需求的现象,采用了一种基于FPGA技术来实现IEEE488接口协议的方案,以典型的GPIB接口芯片NAT9914为蓝本,使用Verilog语言描述GPIB接口功能,调用VISA虚拟仪器函数库开发驱动程序与设备通信,组建完整的自动测试系统,并通过SCPI指令对仪器进行程控、数据采集等操作;该方案有效地解决了专用GPIB芯片停产的问题,同时开发成本低;经实验测试实现了IEEE488接口协议功能,产品性能稳定,各项功能满足测试系统中的测控需求,具有一定的工程实用价值。

As a general parallel bus,IEEE488 is widely used in instrument control and test systems with its advantages of low delay and reliable transmission.At present,the special GPIB chips conforming to the IEEE488 interface protocol,such as NAT9914,uPD7210 and MC68488,have been discontinued,and the products of GPIB controller on sale have few types and are very expensive,which is difficult to meet the needs of the domestic market,a scheme based on FPGA technology is adopted to realize the IEEE488 interface protocol,based on the typical GPIB interface chip NAT9914,the GPIB interface function is described in Verilog language,the visa virtual instrument function library is called to develop the driver to communicate with the equipment,a complete automatic test system is established,and the instrument is programmed and the data is collected through the SCPI instructions.The scheme effectively solves the shutdown problem of special GPIB chip,meanwhile the development cost is low.Through the experimental test,the IEEE488 interface protocol function is realized,the product performance is stable,and all functions meet the measurement and control requirements in the test system,which has certain engineering practical value.