W6100 datasheet(71/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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S0_RX_RSR0(0x0224)

S0_RX_RSR1(0x0225)

0x08

0x00

4.2.29 Sn_RX_RD (SOCKET n RX Read Pointer Register)

[RW] [0x0228-0x229] [0x0000]

Sn_RX_RD is initialized by Sn_CR[OPEN]. The received DATA in SOCKET n RX buffer is read or

updated as the following procedure.

1. HOST reads the start address of the received DATA from Sn_RX_RD in SOCKET n RX

buffer.

2. HOST reads the received DATA from the start address.

3. HOST increases Sn_RX_RD by the read DATA size. If the value of increasing Sn_RX_RD

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

be ignored and the value of Sn_RX_RD must be set to the lower 16bits offset address.

4. HOST sets Sn_CR[RECV] to free SOCKET n RX buffer up by the size of DATA read.

Ex) S0_RX_RD =1536(0x0600)

S0_RX_RD0(0x0228)

S0_RX_RD1(0x0229)

0x06

0x00

4.2.30 Sn_RX_WR (SOCKET n RX Write Pointer Register)

[RO] [0x022C-0x022D] [0x0000]

Sn_RX_WR indicates the last address of the received DATA in SOCKET n TX buffer block.

Sn_RX_WR is initialized by Sn_CR [OPEN] and automatically increased by received DATA size.

If the incremented Sn_RX_WR 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_RX_WR = 1536(0x0600)

S0_RW_WR0(0x022C)

S0_RW_WR1(0x022D)

0x06

0x00

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