W5100S datasheet(49/110 Pages) WIZNET

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W5100S Datasheet Version1.2.5

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Pointer Register) is increased to Data Size. After transmitting Data, Sn_TX_RD increases by

Sn_TX_WR and Sn_IR [SENDOK] occurs.

Ex) S0_TX_RD = 0xd4b3

S0_TX_RD0(0x0422)

S0_TX_RD1(0x0423)

0xd4

0xb3

3.2.17 Sn_TX_WR (SOCKET n TX Write Pointer Register)

[RW] [0x0024+0x0100*(n+4), 0x0025+0x0100*(n+4)] [0x0000]

Sn_TX_WR indicates the last stored Data Address in SOCKET n TX Buffer Block. Sn_TX_RD is

initialized by Sn_CR [OPEN]. On TCP Mode, Sn_TX_RD is re-configured in TCP Connection Process.

Before Sn_CR [SEND] and Sn_CR [SEND_MAC], Sn_TX_WR must be set as transmitting Data Size.

Ex) S0_TX_WR = 0x0800

S0_TX_WR0(0x0424)

S0_TX_WR1(0x0425)

0x08

0x00

3.2.18 Sn_RX_RSR (SOCKET n RX Received Size Register)

[RO] [0x0026+0x0100*(n+4), 0x0027+0x0100*(n+4)] [0x0000]

Sn_RX_RSR indicates received Data Size in SOCKET n RX Buffer Block.

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)

S0_RX_RSR0(0x0426)

S0_RX_RSR1(0x0427)

0x08

0x00

3.2.19 Sn_RX_RD (SOCKET n RX Read Pointer Register)

[RW] [0x0028+0x0100*(n+4), 0x0029+0x0100*(n+4)] [0x0000]

Sn_RX_RD is the last Data Address read by HOST in SOCKET n RX Buffer Block. HOST is available

to read Data from Sn_RX_RD to Sn_RX_WR in SOCKET n RX Buffer Block. After setting Sn_RX_RD

as much as Data read, HOST must set Sn_CR [RECV] to update Sn_RX_RD.

Ex) S0_RX_RD =1536(0x0600)

W5100S Datasheet(PDF) 49 Page - WIZnet Co., Ltd