W5200 datasheet(24/88 Pages) WIZNET

24 / 88 page

Reserved

4.2 Socket Registers

Sn3_MR (Socket n Mode Register) [R/W] [0x4000+0x0n00] [0x00]4

This register sets up socket option or protocol type for each socket.

MULTI

ND / MC

Bit

Symbol

Description

MULTI

Multicasting

0 : disable Multicasting

1 : enable Multicasting

It is applied only in case of UDP.

For using multicasting, write multicast group address to Socket n

Destination IP and multicast group port number to Socket n Destination

Port Register, before OPEN command.

MAC Filter

0 : Disable MAC filter

1 : Enable MAC filter

It is used in MACRAW (P3~P0: “0100”).

When this bit is set as ‘1’, W5200 can receive packet that is belong in

itself or broadcasting. When this bit is set as ‘0’, W5200 can receive all

packets on Ethernet. When using the hybrid TCP/IP stack, it is

recommended to be set as ‘1’ for reducing the receiving overhead of

host.

ND/MC

Use No Delayed ACK

0 : Disable No Delayed ACK option

1 : Enable No Delayed ACK option,

This only applies to TCP case (P3-P0 : “0001”) If this bit is set as ‘1’, ACK

packet is immediately transmitted after receiving data packet from a

peer. If this bit is cleared, ACK packet is transmitted according to internal

timeout mechanism.

n is Socket n-thumber (0, 1, 2, 3, 4, 5, 6, 7).

[Read/Write] [address of socket 0, address of socket 1, address of socket 2, address of socket 3,address of

socket 4, address of socket 5, address of socket 6, address of socket 7] [Reset value]

W5200 Datasheet(PDF) 24 Page - WIZnet Co., Ltd