W5500 datasheet(44/66 Pages) WIZNET

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W5500 Datasheet Version1.0.9

4.2

Socket Registers

Sn4_MR (Socket n Mode Register) [R/W] [0x0000] [0x00]

Sn_MR configures the option or protocol type of Socket n.

MULTI/

MFEN

BCASTB

ND / MC

/MMB

UCASTB

MIP6B

Bit

Symbol

Description

MULTI/

MFEN

Multicasting in UDP mode

0 : disable Multicasting

1 : enable Multicasting

This bit is applied only during UDP mode(P[3:0] = ‘0010’).

To use multicasting, Sn_DIPR & Sn_DPORT should be respectively configured

with the multicast group IP address & port number before Socket n is

opened by OPEN command of Sn_CR

MAC Filter Enable in MACRAW mode

0 : disable MAC Filtering

1 : enable MAC Filtering

This bit is applied only during MACRAW mode(P[3:0] = ‘0100’).

When set as ‘1’, W5500 can only receive broadcasting packet or packet

sent to itself. When this bit is ‘0’, W5500 can receive all packets on

Ethernet. If user wants to implement Hybrid TCP/IP stack, it is

recommended that this bit is set as ‘1’ for reducing host overhead to

process the all received packets.

BCASTB

Broadcast Blocking in MACRAW and UDP mode

0 : disable Broadcast Blocking

1 : enable Broadcast Blocking

This bit blocks to receive broadcasting packet during UDP mode(P[3:0] =

‘0010’). In addition, This bit does when MACRAW mode(P[3:0] = ‘0100’)

ND/MC/

MMB

Use No Delayed ACK

0 : Disable No Delayed ACK option

1 : Enable No Delayed ACK option

This bit is applied only during TCP mode (P[3:0] = ‘0001’).

4n is Socket number (0, 1, 2, 3, 4, 5, 6, 7). n is set ‘SNUM[2:0]’ in Control Bits sets.

W5500 Datasheet(PDF) 44 Page - WIZnet Co., Ltd

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