The W5500 network expansion board integrates a hardware TCP/IP protocol stack, a chip W5500, and a network transformer RJ-45 (HR911105A). Among them, the W5500 is a full hardware TCP/IP embedded Ethernet controller for embedded The system provides a simpler scheme for Internet connection. The hardware logic gate circuit is used to realize the transmission of the TCP/IP protocol stack Layer and network layer (such as: TCP, UDP, ICMP, IPv4, ARP, IGMP, PPPoE and other protocols), and integrated the data link Layer, physical layer, and 32K byte on-chip RAM are used as the data transceiver cache. The master chip of the host computer only needs to undertake TCP/IP application layer control information processing task. Which saves the PC for data replication, protocol processing and The workload and reliability of the system are improved.

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