Design of Network Correspondence Based on the AT89C55WD

The CS8900A is a 10BaseT Ethernet controller with ISA bus.According to 8 bit embedded microcontroller AT89C55WD,it can access and communicate over the Ethernet by directly connecting to MAC layer and physics layer′s interface chip CS8900A.The text introduces the CS8900A chip data and the work principle of data receiving and sending out process,providing the whole frame diagram of the hardware conjunction and the concrete conjunction method of AT89C55WD with CS8900A,putting forward the concept of embedded TCP/IP,the layer structure of the realization and the software project of data processing process in the communication.