Datasheet

44 / 66 W5500 Datasheet Version1.0.9
4.2 Socket Registers
Sn
4
_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/
MFEN
BCASTB
ND / MC
/MMB
UCASTB
MIP6B
P3
P2
P1
P0
Bit
Symbol
Description
7
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.
6
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’)
5
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’).
4
n is Socket number (0, 1, 2, 3, 4, 5, 6, 7). n is set ‘SNUM[2:0]’ in Control Bits sets.