W6100 datasheet(108/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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goto 6.2.1 TCP SERVER : Receiving Process with get_size = data_size;

}

 Send DATA? / Sending Process

Refer to 6.3.1 UDP Unicast : Send Data? / Sending Process

 Complete sending? / Timeout?

Refer to 6.3.1 UDP Unicast: Complete Sending? / Timeout?

 Finished? / CLOSE

Refer to 6.3.1 UDP Unicast: Finished? / CLOSE

6.3.5 Other Functions

6.3.5.1

UDP Mode SOCKET Options

Before Sn_CR[OPEN] command, SOCKET option can be set by Sn_MR and Sn_MR2.

 Destination Hardware Address by Sn_DHAR : Sn_MR2[DHAM]= ‘1’

ARP/ND-process is skipped and Sn_DHAR is used as the destination hardware address.

 Destination Hardware Address by ARP : Sn_MR2[DHAM]= ‘0’

The destination hardware address of UDP data to be transmitted is used as the acquired

address from ARP/ND-process.

 Force ARP : Sn_MR2[FARP]= ‘1’

ARP/ND-process is performed whenever UDP DATA packet is transmitted by Sn_CR[SEND]

or Sn_CR[SEND4].

If Sn_MR2 [DHAM] is also set, ARP/ND-process is performed but the Sn_DHAR is used as

the destination hardware address.

 Auto ARP : Sn_MR2[FARP]= ‘0’

ARP/ND-process is performed when the first UDP data packet is transmitted or when the

destination is changed.

6.3.5.2

UDP Block

In UDP Mode, Unicast and Broadcast packets can be received. But Broadcast packets are

blocked if Sn_MR[BRDB] is set to ‘1’.

In UDP Multicast mode, Unicast, Broadcast and Multicast packets can be received. But if

Sn_MR[UNIB] or Sn_MR[BRDB] are set to ‘1’, Unicast or Broadcast packets are blocked

respectively.

W6100 Datasheet(PDF) 108 Page - WIZnet Co., Ltd