【作者】 付冲； 陈英； 马希敏； 张永元；

【Author】 FU Chong CHEN Ying MA Xi-min ZHANG Yong-yuan(1.School of Information Science & Engineering,Northeastern University,Shenyang 110004,China;2.Computer Department,Liaoning Economic Professional Technology College,Shenyang 110036,China)

【机构】 东北大学信息科学与工程学院； 辽宁经济职业技术学院计算机系；

【摘要】 以基于精简指令集(RISC)技术的AT90S8515单片机和RTL-8139以太网接口控制器(NIC)为硬件平台,针对嵌入式系统资源有限的特点,提出了一种通用的嵌入式系统以太网接口设计与实现方案.详细阐述了RTL-8139NIC的逻辑结构、工作原理、直接内存访问(DMA)控制器数据发送/接收原理及以太帧封装过程,深入讨论了NIC初始化、数据帧收发、本地/远程DMA操作的寄存器编程过程,给出了一个完整的以太帧接收/发送实现方案.更多还原

【Abstract】 In this paper,a design and implementation scheme of a general embedded system Ethernet interface is proposed based on AT90S8515 single chip that uses RISC technology and RTL-8139 network interface con- troller hardware platform.The design aims at the characteristics that the embedded system only has limited re- sources.The logic structure,operation principle,DMA controller data sending/receiving principles of RTL- 8139 NIC and Ether frame encapsulation course have been explained in detail.The register programming pro- cess of NIC initializing,data frame receiving and dispatching,operation of local/remote DMA controller have been deeply discussed,providing a completed implementation scheme of sending/receiving an Ethernet frame.更多还原