基于嵌入式NIOS Ⅱ的μC/TCP-IP网络接口设计

Design Of μC/TCP-IP network interface Based on Imbedded NIOS Ⅱ

本文阐述了基于32位软核处理器NIOS Ⅱ的网络接口实现方法:硬件方面,采用集成在FPGA内部的可编程、可裁剪的NIOS软核为主控制器,网络接口部分采用以太网控制芯片LAN91C111实现;软件方面对各模块的设计进行了详细分析,包括基于μC-OS的LwIP协议的实现、硬件驱动程序的实现以及在通信协议基础上的软件设计流程。该设计具有通用性好、集成度高、可扩展性强、低成本等优点,有广泛的应用价值。

This paper presents the implementation of network interface based on 32-bit Soft-Core processor NIOS II. One the hardware side, the main controller adopts a tailorable and programmable soft-core processor NIOS, which is integrated in FPGA. The network interface is implemented with the Ethernet control chip LAN91C 111. One the software side, the design of each system model is analyzed in detail, including the implementation of LwIP based on C-OS, the hardware driver, and the design flow of communication protocol software. The proposed design improves the performance in the aspects of generality, integration degree, scalability, and cost, and therefore has widespread application value.