cs8900a 驱动 TCP/TP协议网络通信，1、可以接收和发送帧 2、 实现了ARP报文传输；3、 ARP应答；4、实现了ICMP协议-cs8900a driven TCP / TP network communication agreement, one that can receive and send two fr a mes, to achieve the ARP packet transmission; 3, ARP response; 4, achieved the ICMP