W5200 datasheet(67/88 Pages) WIZNET

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layer protocol to suit the host’s needs.

The MACRAW mode can only be used with a SOCKET. If the user uses the SOCKET in

MACRAW mode, not only can it use the SOCKET1~7 in the ‘Hardwired TCP/IP stack’, but

it can also be used as a NIC (Network Interface Controller). Therefore, any SOCKET1~7

can be used with ‘Software TCP/IP stack’. Since the W5200 supports ‘Hardwired TCP/IP

stack’ and ‘Software TCP/IP stack’, it calls ‘Hybrid TCP/IP stack’. If user wants more

SOCKETs beyond the supported 8 SOCKETS, the SOCKET in which the user wants high

performance should be utilizing the ‘‘Hardwired TCP/IP stack’, and the others should

be using ‘Software TCP/IP stack’ by MACRAW mode. So it overcomes the limited capacity

of 8 SOCKETS. The SOCKET of MACRAW mode can process all protocols except using in

SOCKET1~7. Since the MACRAW communication is pure Ethernet packet communication

(there is no other processing), the MACRAW designer should use the ‘Software TCP/IP

stack’ to process the protocol. The MACRAW data should basically contain the 6bytes of

‘Source hardware address’, 6bytes of ‘destination hardware address’ and 2bytes of

‘Ethernet type’ because it is based on Ethernet MAC.

Figure 16 MACRAW Operation Flow

W5200 Datasheet(PDF) 67 Page - WIZnet Co., Ltd