W5100 WIZnet, W5100 Datasheet - Page 57

• 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.
5.2.3 IP raw
IP Raw mode can be utilized if transport layer protocol of some ICMP or IGMP that W5100 does
not support, needs to be processed.
{
START:
}
/* sets IP raw mode */
Sn_MR = 0x03;
/* sets Protocol value */
/* The value of Protocol is used in Protocol Field of IP Header.
Sn_PROTO = protocol_value;
/* sets OPEN command */
Sn_CR = OPEN;
/* Check if the value of Socket n Status Register(Sn_SR) is SOCK_IPRAW. */
if (Sn_SR != SOCK_IPRAW) Sn_CR = CLOSE; goto START;
For the list of protocol identification number of upper classification, refer to on line
documents of IANA (http://www.iana.org/assignments/protocol-numbers). */

It initializes the socket as IP raw.
Socket Initialization
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