W5100 WIZnet, W5100 Datasheet - Page 51

• Manufacturer Part Number: W5100
• Description: Ethernet ICs 3-IN-1 ENET CONTR TCP/IP+MAC+PHY
• Manufacturer: WIZnet

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

© 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
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