2015年荐USB无线网卡的SOPC接口设计.docVIP

USB无线网卡的SOPC接口设计 摘 要 嵌入式系统的无线局域网接入可以实现嵌入式系统的无线控制数据传输，从而使嵌入式系统的控制、运行以及开发更加方便，并可以满足一些特殊的应用场合。而USB无线网卡驱动程序的设计是嵌入式系统的无线局域网接入的关键环节。 本文通过对无线局域网IEEE802.11b协议规范和SOPC技术的深入理解和分析，利用基于Nios II嵌入式软核处理器和IEEE802.11b的USB无线网卡来实现嵌入式系统的无线局域网接入。 首先，本文认真研究了USB协议，深入理解和分析了USB通信的基本概念和传输方式等内容。其次，详细分析了USB接口芯片ISP1362及无线网卡接口芯片ISL3873的控制原理及编程结构。最后，在基于Nios II处理器构建的SOPC硬件平台上，阐述了USB驱动程序和无线网卡驱动程序的设计方法。 关键词 USB无线网卡、SOPC、ISP1362 The Interface Design of USB Wireless Network Card Based on SOPC Abstract Embedded Systems wireless LAN access can realize embedded systems wireless control data transmission, thus makes embedded systems control, operation as well as the development more convenient, and may meet some special application. And the design of the USB wireless network card driver is the key link of embedded systems wireless LAN access. Wireless LAN IEEE802.11b protocol standard and SOPC technology are understood and analyzed deeply in this paper. And the Nios II embedded soft nuclear processor and the USB wireless network card fitted with IEEE802.11b standard are used to realize embedded systems wireless LAN access. First, the USB protocol has been earnestly studied in the paper, and the basic concept and transmission mode of USB communication have been understood and analyzed in-depth. Secondly, control principle and programming structure of USB connection chip ISP1362 and wireless network card connection chip ISL3873 have been analyzed in detail. Finally, on the SOPC hardware platform based on Nios II processor, the design method of the USB driver and the wireless network card driver has been elaborated. Key word USB wireless network card、SOPC、ISP1362 目 录 1 绪论 5 1.1 USB无线网卡的发展及应用 5 1.2 SOPC技术的发展前景 6 1.3 USB无线网卡SOPC接口设计的目的及意义 7 2 USB协议简介 9 2.1 USB数据流模型 9 2.1.1 端点（Endpoint） 10 2.1.2 管道（Pipe） 11 2.1.3 包（Pack） 11 2.1.4 事务（Transaction） 13 2.2 数据传输类型 15 2.2.1 控制传输（Control Transfer） 16 2.2.2 批量传输（Bulk Transfer） 20 2.2.3 中断传输(Interrupt Transfer) 22 2.2.4 同步传输（Synchronous Transfer） 22 2.3 USB设备总线枚举