W5200 datasheet(35/88 Pages) WIZNET

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UDP DATA packets before performing SEND or SEND_MAC command.

At the PPPoE mode, the PPP session ID that is already known is set in the S0_DPORT. PPP session

ID (set by S0_DPORT0) is applied to PSIDR after performing the OPEN command.

Ex) In case of Socket 0 Destination Port = 5000(0x1388), configure as below,

0x4010

0x4011

0x13

0x88

Sn_MSS (Socket n Maximum Segment Size Register)[R/W][0x4012+0x0n00-0x4013+0x0n00]

[0x0000]

This register is used for MSS (Maximum Segment Size) of TCP, and the register displays MSS set

by the other party when TCP is activated in Passive Mode. It just supports TCP or UDP mode.

When using PPPoE (MR(PPPoE)=‘1’), the MTU of TCP or UDP mode is assigned in the range of

MTU of PPPoE.

Mode

Normal (MR(PPPoE)=‘0’)

PPPoE (MR(PPPoE)=‘1’)

Default

MTU

Range

Default

MTU

Range

TCP

1460

1 ~ 1460

1452

1 ~ 1452

UDP

1472

1 ~ 1472

1464

1 ~ 1464

IPRAW

1480

1472

MACRAW

1514

At the IPRAW or MACRAW, MTU is not processed internally, but default MTU is used. Therefore,

when transmitting the data bigger than default MTU, the host should manually divide the data

into the unit of default MTU.

At the TCP or UDP mode, if transmitting data is bigger than MTU, W5200 automatically divides

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 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 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 (

http://www.iana.org/assignments/protocol-numbers

W5200 Datasheet(PDF) 35 Page - WIZnet Co., Ltd

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