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W5100S Scheda tecnica(PDF) 73 Page - WIZnet Co., Ltd

Il numero della parte W5100S
Spiegazioni elettronici  embedded Ethernet controller
PDF  110 Pages
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Produttore elettronici  WIZNET [WIZnet Co., Ltd]
Homepage  https://www.wiznet.io/ko/Product/
Logo WIZNET - WIZnet Co., Ltd

W5100S Scheda tecnica(HTML) 73 Page - WIZnet Co., Ltd

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4.4.4 Other Functions
4.4.4.1
UDP MAC Send
When Peer MAC Address is known, UDP Mode SOCKET transmits Data Packet without the ARP
Process by setting Sn_DHAR.
(Ref 4.4.1 UDP Unicast : Send DATA? / Sending Process)
4.4.4.2
UDP SOCKET Options
In UDP Mode, Unicast and Broadcast Packets are received. But if Sn_MR2 [BRDB] is set to ‘1’,
Broadcast Packet is blocked.
In UDP Multicast Mode, Unicast, Broadcast and Multicast Packets are received. But if Sn_MR2
[UNIB] or Sn_MR2 [BRDB] are set to ‘1’, Unicast or Broadcast Packets are blocked.
These Block Bits must be set before Sn_CR [OPEN] Command.
Sn_MR[MULTI] Sn_MR2[BRDB] Sn_MR2[UNIB]
Unicast
Multicast
Broadcast
0
0
Don’t Care
O
X
O
0
1
Don’t Care
O
X
X
1
0
0
O
O
O
1
0
1
X
O
O
1
1
0
O
O
X
1
1
1
X
O
X
4.4.4.3
Port Unreachable Block
If Peer transmits UDP Packet to a Port that does not exist on W5100S. W5100S automatically
transmits ICMP Packet (Destination Port Unreachable) to Peer. But it could be the target for
Port Scan Attack. But if MR2 [UDPURB] is set to ‘1’, W5100S does not transmit ICMP Packet
(Destination Port Unreachable).



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