基于FPGA以太网MAC协议设计及实现.docx

华中科技大学硕士学位论文摘要随着互联网的飞速发展,以太网的应用也越来越广泛,速度也越来越快。在网络安全领域,通常使用网络过滤设备来对大量的以太网数据包进行分析。网络过滤设备正常工作的关键是对以太网数据包的正确收发,而这也正是以太网 MAC (媒体接入控制)层的主要功能。以太网 MAC 协议的设计实现,在以太网的相关应用中有十分重要的作用。同时,采用 FPGA 作为设计实现的载体,可以缩短开发周期,为调试修改提供便利。本文在对 MAC 协议进行分析理解的基础上,将整个 MAC 协议的实现分为数据接收,数据发送和控制管理三个部分,并说明了他们之间的相互关系。此外,各个部分按照数据流向和具体功能又划分了若干个子模块。数据接收和发送部分主要划分了接口转换,前导帧处理,校验码处理等模块,负责对发送和接收的数据进行处理分析。控制管理部分则为外部调试与配置提供了相应的接口,包括流量统计信息的读取,外部 PHY 芯片的配置等。在详细阐述了各模块的设计实现之后,本文针对系统特点,搭建了仿真平台,给出了模块级和系统级的仿真结果,最后在硬件上测试之后,对仿真和测试的结果进行了分析。本文设计实现的 MAC 协议以 Altera 公司的 Cyclone 3系列的 FPGA 芯片为载体, 运用 Verilog HDL 语言进行 RTL 级别的功能描述,能够实时地处理千兆的网络数据流量,并且可以通过 CPU 总线对外部 PHY 芯片进行配置,达到了预期的目标。关键词:以太网, MAC, FPGA, Verilog I 华中科技大学硕士学位论文 Abstract With the rapid development of , applications are increasingly used, and their speed is faster and faster. In the field work security, we typically work filtering devices to analyse packets. To work filtering devieces work properly, the key is correctly to send and receive data packets, and this is also the media access control (MAC) layer's main function. The design and implementation of MAC has an important role in related applications. Meanwhile, as the design and implementation carrier, FPGA can shorten the development cycle and makes debugging very convenient. Based on the analysis of MAC protocols, this paper divides the implementation into three parts, including data reception, data transmission and management. In addition, we use diagram to show the relationship between these three parts, which are further divided according to the data processing flow and specific features. The data reception and transmission parts are responsile for data analysis and processing, which mainly include interface conversion, leading frame and checksum processing modules. The management part provides a debugging and configuration interface, including traffic statistics, PHY chip configuration etc. After detailed design and implementation of each module, we set upa simulation platform and get the simulation resu