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W5500 Datasheet Version1.0.9

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When this bit is ‘1’, It sends the ACK packet without delay as soon as a

Data packet is received from a peer. When this bit is ‘0’, It sends the ACK

packet after waiting for the timeout time configured by RTR.

Multicast

0 : using IGMP version 2

1 : using IGMP version 1

This bit is applied only during UDP mode(P[3:0] = ‘0010’) and MULTI = ‘1’.

It configures the version for IGMP messages (Join/Leave/Report).

Multicast Blocking in MACRAW mode

0 : disable Multicast Blocking

1 : enable Multicast Blocking

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

receive the packet with multicast MAC address.

UCASTB

MIP6B

UNICAST Blocking in UDP mode

0 : disable Unicast Blocking

1 : enable Unicast Blocking

This bit blocks receiving the unicast packet during UDP mode(P[3:0] =

‘0010’) and MULTI = ‘1’.

IPv6 packet Blocking in MACRAW mode

0 : disable IPv6 Blocking

1 : enable IPv6 Blocking

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

It blocks to

receiving the IPv6 packet.

Protocol

This configures the protocol mode of Socket n.

Meaning

Closed

TCP

UDP

MACRAW

* MACRAW mode should be only used in Socket 0.

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