W6100 datasheet(67/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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In UDP4, UDP6, UDPD and IPRAW6 mode, Sn_DPORTR is set to the peer’s destination port.

In UDP4 and UDP6 multicast mode, Sn_DPORTR is set to the multicast group port.

ref) 6.3.3 UDP Multicast

Ex) S0_DPORTR = 5000 (0x1388),

S0_DPORTR0(0x0140)

S0_DPORTR1(0x0141)

0x13

0x88

4.2.19 Sn_MR2 (SOCKET n Mode register 2)

[R=W] [0x0144] [0x00]

Sn_MR2 sets SOCKET n option like Sn_MR.

DHAM

FARP

R=W

Bit

Symbol

Description

[7:2]

Reserved

DHAM

Destination Hardware address Mode

It sets destination hardware address of Ethernet frame to be sent when

Sn_MR[3:0] is not MACRAW mode.

0 : Destination hardware address is set to the address obtained

through ARP-process.

1 : Destination hardware address is set to the value in Sn_DHAR.

FARP

Force ARP

When Sn_MR is UDP4, UDP6, UDPD, IPRAW4 and IPRAW6 mode, SOCKET

n performs ARP/ND-process on every Sn_CR[SEND] or Sn_CR[SEND6].

When Sn_MR is TCP4, TCP6, TCPD and the TCP operation mode is “TCP

SERVER”, the ARP/ND-process is performed before sending the

SYN/ACK packet.

The destination hardware address obtained by ARP-process is used as

destination hardware address of packet to be sent.

0 : Disable

1 : Enable

W6100 Datasheet(PDF) 67 Page - WIZnet Co., Ltd