W5500 Datasheet, PDF (44/65 Pages) List of Unclassifed Manufacturers – Supports 8 independent sockets simultaneously

4.2 Socket Registers
Sn³_MR (Socket n Mode Register) [R/W] [0x0000] [0x00]
Sn_MR configures the option or protocol type of Socket n.
7
6
5
4
3
2
1
0
MULTI/
ND / MC UCASTB
BCASTB
P3
P2
P1
P0
MFEN
/MMB
MIP6B
Bit Symbol
Description
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
MULTI/
7
MAC Filter Enable in MACRAW mode
MFEN
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.
Broadcast Blocking in MACRAW and UDP mode
0 : disable Broadcast Blocking
6
BCASTB 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‟)
Use No Delayed ACK
0 : Disable No Delayed ACK option
ND/MC/
5
1 : Enable No Delayed ACK option
MMB
This bit is applied only during TCP mode (P[3:0] = „0001‟).
When this bit is „1‟, It sends the ACK packet without delay as soon as a
3_{n is Socket number (0, 1, 2, 3, 4, 5, 6, 7). n is set „SNUM[2:0]‟ in Control Bits sets.}
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W5500 Datasheet Version1.0 (August 2013)