[信息与通信]LXI扫描开关设计.doc

摘　　要本文最后对 关键词：LXI；；Abstract This thesis gives emphasis on the design of LXI-Scanning Switches. LXI-Scanning Switches is a module that plays an important role in the automatic test of transforming among various signals. LXI is the lastest bus technology following the VXI, PXI bus technology, based on the Ethernet technogy, it integrates more merits: it is strongly exchangeable with a small footprint, it is also faster and easier to build a automatic test system by using LXI technology. The device of switch is one of the eight devices in the IVI driver standard. In this thesis, the function part of the LXI device is designed. It chooses the chip FPGA as the main component for controlling and all the relays are directly controlled by the FPGA. To gurantee the electric current when relays work, all the relays are drived by the chip MC1413. In the thesis, the logic is designed in Verilog HDL. It is better to achieve the function of controlling in the logic since there is no limit in the process of program which exists in the software. The characteristic that all the clock modules work parallelly makes it possible for several groups of relays to scan at the same time. In the aspect of the software, both of the client pages based on WEB server and CGI programs which are started by the corresponding pages are designed.Meanwhile, on the basis of the designed IVI-COM driver, the program to analyze and excute commands is developed. At last, the thesis introduces the the test process, test method and test result for LXI-Scanning Switches module. Keywords：LXI; ; Relay; FPGA 目　　录 摘　　要 I Abstract II 第1章 绪论 1 1.1 研究的目的和意义 1 1.2 国内外研究现状 2 1.2.1 仪器总线技术的发展历程 2 1.2.2 LXI技术现状及特点 3 1.2.3 扫描开关技术 4 1.3 主要研究内容 5 1.4 论文结构 6 第2章 总体设计方案 7 2.1 模块的主要功能和技术指标 7 2.2 模块的总体设计方案 7 2.3 硬件设计方案 9 2.4 软件设计方案 10 2.4.1 基于WEB网页控制的软件方案 10 2.4.2 基于IVI-COM驱动控制的软件方案 11 2.5 本章总结 12 第3章 硬件电路设计及逻辑设计 13 3.1 功能板电路设计 13 3.1.1 FPGA与核心板ARM接口设计 13 3.1.2 继电器排布设计和继电器与外部接口设计 14 3.1.3 继电器驱动电路设计 15 3.2 FPGA芯片内部逻辑设计 17 3.2