W6100 datasheet(64/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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* CAUTION

Fragment field can be set to any values. But W6100 SOCKET does not perform

fragmentation and does not process any fragmented received packet.

Ex) S0_FRGR0 = 0x0000 (DO NOT fragment)

S0_FRGR0(0x010C)

S0_FRGR1(0x010D)

0x00

4.2.13 Sn_MSSR (SOCKET n Maximum Segment Size Register)

[R=W] [0x0110-0x0111] [0xFFFF]

Sn_MSSR sets SOCKET n MSS (Maximum Segment Size) and it must be done before Sn_CR[OPEN].

Each SOCKET mode has the MSS range. And if SOCKET n MSS set by Sn_MSSR exceeds the MSS

range, it automatically sets the maximum MSS in the MSS range.

Sn_MR[3:0]

Normal Range

(NETMR2[PPPoE]=’0’)

PPPoE Range

(NETMR2[PPPoE]=’1’)

TCP

1~1460

1~1452

TCP6

1~1440

1~1432

UDP

1~1472

1~1464

UDP6

1~1452

1~1444

IPRAW

1~1480

1~1472

IPRAW6

1~1460

1~1452

MACRAW

1~1514

Ex) S0_MSSR = 1460 (0x05B4),

S0_MSSR0(0x0110) S0_MSSR1(0x0111)

0x05

0xB4

4.2.14 Sn_PORTR (SOCKET n Source Port Register)

[R=W] [0x0114-0x0115] [0x0000]

Sn_PORTR sets SOCKET n Source Port Number.

Ex) S0_PORTR = 5000 (0x1388)

S0_PORTR0(0x0114)

S0_PORTR1(0x0115)

0x013

0x88

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