Data Sheet

iEthernet W5200

the data into the unit of MTU. MTU is called as MSS at the TCP mode. By selecting from Host-

Written-Value and peer's MSS, MSS is set as smaller value through TCP connection process.

Ex) In case of Socket 0 MSS = 1460(0x05B4), configure as below,

0x4012 0x4013

0x05 0xB4

Sn_PROTO (Socket n-th IP Protocol Register) [R/W] [0x4014+0x0n00] [0x00]

It is a 1 byte register that sets the protocol number field of the IP header at the IP layer. It is

valid only in IPRAW mode, and ignored in other modes. Sn_PROTO is set before OPEN

command. When Socket n-th is opened in IPRAW mode, it transmits and receives the data of

the protocol number set in Sn_PROTO. Sn_PROTO can be assigned in the range of 0x00 ~ 0xFF,

but W5200 does not support TCP(0x06) and UDP(0x11) protocol number

Protocol number is defined in IANA(Internet assigned numbers authority). For the detail, refer

to online document (

Uhttp://www.iana.org/assignments/protocol-numbersU).

Ex) Internet Control Message Protocol (ICMP) = 0x01, Internet Group Management Protocol

= 0x02

Sn_TOS (Socket n-th IP Type Of Service Register) [R/W] [0x4015+0x0n00] [0x00]

It sets the TOS(Type of Service) field of the IP header at the IP layer. It should be set before

the OPEN command. Refer to

Uhttp://www.iana.org/assignments/ip-parametersU .

Sn_TTL (Socket n-th IP Time To Live Register) [R/W] [0x4016+0x0n00] [0x80]

It sets the TTL(Time To Live) field of the IP header at the IP layer. It should be set before the

OPEN command. Refer to

Uhttp://www.iana.org/assignments/ip-parametersU.