Data Sheet

iEthernet

W5200

3 Reserved Reserved

2 Reserved Reserved

1 Reserved Reserved

0 Reserved Reserved

4.2 Socket Registers

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

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

7 6 5 4 3 2 1 0

MULTI MF ND / MC

P3 P2 P1 P0

Bit Symbol Description

7 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.

6 MF

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.

5 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]