W5100S datasheet(47/110 Pages) WIZNET

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W5100S Datasheet Version1.2.5

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Sn_MSS sets SOCKET n MSS and it must be set before Sn_CR [OPEN]. Sn_MSS must not be

exceeded specified size as below table.

Mode

Normal (MR [PPPoE]=’0’) Range

PPPoE (MR [PPPoE]=’1’) Range

TCP

1~1460

1~1452

UDP

1~1472

1~1464

IPRAW

1480

1472

MACRAW

1514

Ex) S0_MSS = 1460 (0x05B4),

S0_MSS0(0x0412)

S0_MSS1(0x0413)

0x05

0xB4

3.2.10 Sn_PROTOR (SOCKET n IP Protocol Register)

[R=W] [0x0014+0x0100*(n+4)] [0x0000]

Sn_PROTOR configures Protocol Number (Ref IANA_Protocol Number) of IP Header except for

TCP (0x06), UDP (0x11) and IGMP (0x01).

On IPRAW Mode, only the Protocol configured in Sn_PROTR can be transmitted and received.

Ex) ICMP (Internet Control Message Protocol) = 0x01

3.2.11 Sn_TOS (SOCKET n IP Type Of Service Register)

[R=W] [0x0015+0x0100*(n+4)] [0x00]

Sn_TOS configures the TOS (Type Of Service) of IP Header. (Ref IANA_IP Parameters)

3.2.12 Sn_TTL (SOCKET n IP Time To Live Register)

[R=W] [0x0016+0x0100*(n+4)] [0x80]

Sn_TTL configures TTL (Time To Live) of IP header. (Ref IANA_IP Parameters)

3.2.13 Sn_RXBUF_SIZE (SOCKET n RX Buffer Size Register)

[RW] [0x001E+0x0100*(n+4)] [0x02]

Sn_RXBUF_SIZE configures SOCKET n RX Buffer Size as 0, 1, 2, 4 and 8 Kbytes. RX Memory is

sequentially allocated from SOCKET 0 to SOCKET 3. The total sum of Sn_RXBUF_SIZE must not

be exceeded 8 Kbytes. Sn_RXBUF_SIZE can also be configured by RMSR.

Value (Dec)

Buffer size

0KB

1KB

2KB

4KB

8KB

Ex) S0_RXBUF_SIZE = 8KB

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