W6100 datasheet(70/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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4.2.26 Sn_TX_WR (SOCKET n TX Write Pointer Register)

[RW] [0x020C-0x20D] [0x0000]

Sn_TX_WR is initialized by Sn_CR[OPEN].

To send DATA, Sn_TX_WR is processed as the following procedure.

1. HOST reads the start address to store the sending DATA from Sn_TX_WR.

2. HOST stores the sending DATA from the start address in SOCKET n TX buffer.

3. HOST increases Sn_TX_WR by the size of the sending DATA. If the value of Sn_TX_WR

exceeds 0xFFFF(the maximum value of 16bits Offset Address), the carry bit(17th bit) will

be ignored and the value of Sn_TX_WR must be set to the lower 16bits Offset Address.

4. HOST sets Sn_CR[SEND] to send the stored DATA in SOCKET n TX buffer.

Ex) S0_TX_WR = 0x0800

S0_TX_WR0(0x020C)

S0_TX_WR1(0x020D)

0x08

0x00

4.2.27 Sn_RX_BSR (SOCKET n RX Buffer Size Register)

[R=W] [0x0220] [0x02]

Sn_RX_BSR sets SOCKET n RX Buffer Size to 0, 1, 2, 4, 8 or 16 KB.

If the total size of SOCKET n RX buffer exceeds 16KB, it causes a malfunction in buffer

read/write access process.

Value (Dec)

Buffer size

0KB

1KB

2KB

4KB

8KB

16KB

Ex) S0_RX_BSR = 8 Kbytes

S0_RX_BSR(0x0220)

0x08

4.2.28 Sn_RX_RSR (SOCKET n RX Received Size Register)

[RO] [0x0224-0x0225] [0x0000]

Sn_RX_RSR indicates the size of received DATA in SOCKET n RX buffer.

In TCP, UDP, IPRAW and MACRAW mode,

Sn_RX_RSR = | Sn_RX_WR(1) – Sn_RX_RD(2)|

(1) SOCKET n RX Write Pointer Register

(2) SOCKET n RX Read Pointer Register

Ex) S0_RX_RSR = 2048 (0x0800)

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