W5100 WIZnet, W5100 Datasheet - Page 51
W5100
Manufacturer Part Number
W5100
Description
Ethernet ICs 3-IN-1 ENET CONTR TCP/IP+MAC+PHY
Manufacturer
WIZnet
Datasheet
1.W5100.pdf
(71 pages)
Specifications of W5100
Rohs
yes
Product
Ethernet Controllers
Data Rate
10 Mb/s, 100 Mb/s
Supply Voltage - Max
3.6 V
Supply Voltage - Min
3 V
Maximum Operating Temperature
+ 80 C
Package / Case
LQFP-80
Ethernet Connection Type
10Base-T, 100Base-TX
Minimum Operating Temperature
- 40 C
Mounting Style
SMD/SMT
Standard Supported
802.3, 802.3u
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© Copyright 2009-2010 WIZnet Co., Inc. All rights reserved.
5.2.2 UDP
UDP provides unreliable and connectionless datagram transmission structure. It processes
data without connection establishment. Therefore, UDP message can be lost, overlapped or
reversed. As packets can arrive faster, recipient can not process all of them. In this case, user
application should guarantee the reliability of data transmission. UDP transmission can be
processed as below,
{
START:
}
/* sets UDP mode */
Sn_MR = 0x02;
/* sets source port number */
Sn_PORT = source_port;
/* sets OPEN command */
Sn_CR = OPEN;
/* Check if the value of Socket n Status Register(Sn_SR) is SOCK_UDP . */
if (Sn_SR != SOCK_UDP) Sn_CR = CLOSE; goto START;
/* ※ The value of Source Port can be appropriately delivered when remote HOST knows it. */
Initialize the socket n as UDP .
Socket Initialization
51