基于DM9000A的网络接口设计

为了实现嵌入式以太网通信，使用以太网控制芯片DM9000A和单片机MSP430F5529，组成了嵌入式以太网接口，实现了网络通信，其中单片机完成自身以及以太网控制芯片的初始化、数据的封包和收发控制，而DM9000A芯片负责网络数据的发送和接收。详细介绍了系统的硬件构成框图和硬件设计，给出了实际的接口电路，重点描述了单片机和DM9000A芯片之间的软件接口程序设计，并给出了网络通信协议的应用方法。实验结果表明，该设计体积小、接口简单、速度快、功耗低，具有很高的推广价值。

Design of network interface based on DM9000A

For achieving the embedded Ethernet communication,Ethernet control chip DM9000A and MCU MSP430F5529 are used to make up the embedded Ethernet interface and realize the network communication.The MCU is applied to the initialization of itself and Ethernet carp chip,data packet and transceiving control,while the Ethernet carp chip DM9000A is used to receive and send the network data.The hardware block diagram,hardware design and practical interface circuit of the system are presented in detail.The program design of the software interface between MCU and DM9000A is described emphatically.The application method of network communication protocal is given.The experimental result shows that the design is worth of spreading due to the small volume,simple interface,fast speed and low power consumption of the system.