W6100 datasheet(69/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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Value (Dec)

Buffer size

0KB

1KB

2KB

4KB

8KB

16KB

Ex) S0_TX_BSR= 4 Kbytes

S0_TX_BSR(0x0200)

0x04

4.2.24 Sn_TX_FSR (SOCKET n TX Free Buffer Size Register)

[RO] [0x0204-0x205] [0x0000]

Sn_TX_FSR indicates the free size in SOCKET n buffer block.

In UDP, IPRAW and MACRAW mode,

Sn_TX_FSR = Sn_TX_BSR – | Sn_TX_WR(1) – Sn_TX_RD(2) |

In TCP mode,

Sn_TX_FSR = Sn_TX_BSR – | Sn_TX_WR – Internal Pointer(3) |

(1) SOCKET n TX Write Pointer Register

(2) SOCKET n TX Read Pointer Register

(3) TCP ACK Pointer managed by W6100

Make sure sending DATA size does not exceed the size in sn_TX_FSR.

Ex) S0_TX_FSR = 1024 (0x0400)

S0_TX_FSR0(0x0204)

S0_TX_FSR1(0x0205)

0x04

0x00

4.2.25 Sn_TX_RD (SOCKET n TX Read Pointer Register)

[RO] [0x0208-0x0209] [0x0000]

Sn_TX_RD is initialized by Sn_CR[OPEN].

By Sn_CR [SEND], SOCKET sends DATA, which is stored from Sn_TX_RD to Sn_TX_WR in SOCKET

n TX Buffer. After sending DATA, Sn_IR [SENDOK] is set and Sn_TX_RD is automatically increased

by sent data size. If the auto-increment Sn_TX_RD exceeds the maximum value 0xFFFF of the

16-bit offset address and the Carry bit (17th bit) occurs, the carry bit is ignored and

automatically set to the lower 16 bits value.

Ex) S0_TX_RD = 0xd4b3

S0_TX_RD0(0x0208)

S0_TX_RD1(0x0209)

0xd4

0xb3

W6100 Datasheet(PDF) 69 Page - WIZnet Co., Ltd

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