W6100 datasheet(59/149 Pages) WIZNET

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W6100 – Hardwired Dual TCP/IP Stack Controller

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By CLOSE command, SOCKET is closed immediately and Sn_SR changes

to SOCK_CLOSED regardless of the previous status.

* CAUTION : In TCP4, TCP6 and TCPD Mode, SOCKET is closed without

sending FIN Packet

0x20

SEND *

SEND Command

SOCKET sends DATA packet in TCP4, TCP6, TCPD, UDP4, UDPD, IPRAW4

and MACRAW mode.

0xA0

SEND6 *

IPv6 SOCKET SEND Command

SOCKET sends DATA packet in UDP6, UDPD and IPRAW6 mode.

0x22

SEND_KEEP

TCP SEND_KEEP Command

SEND_KEEP command is used only in TCP4, TCP6 and TCPD mode and It

is valid only in case that HOST sent at least 1 Byte DATA before

SEND_KEEP command.

SEND_KEEP command sends Keep Alive (KA) packet to peer for checking

if TCP connection is still valid. If ACK packet for KA packet is not

received, Sn_IR[TIMEOUT] occurs and Sn_SR is set SOCK_CLOSED after

the configured retransmission time.

ref) 6.2.4.2

Keep Alive

0x40

RECV

SOCKET RECV Command

By RECV command, HOST can read data received in SOCKET n RX Buffer

block. Sn_RX_RD(SOCKET n Read Pointer Register) must be increased by

the size of the read data.

ref) 4.2.28 Sn_RX_RSR (SOCKET n RX Received Size Register), 4.2.30

Sn_RX_WR (SOCKET n RX Write Pointer Register), 4.2.29 Sn_RX_RD (SOCKET

n RX Read Pointer Register)

* By SEND or SEND6 Commands, SOCKET sends DATA and the DATA size is calculated by Sn_TX_WR(SOCKET n TX

Write Pointer Register) and Sn_TX_RD(SOCKET n TX Read Pointer Register). Sending DATA must not exceed

Sn_TX_FSR(SOCKET n TX Free Buffer Size Register) and HOST sets next SEND Command after Sn_IR[SENDOK]

= ‘1’.

* In TCP4, TCP6, TCPD, UDP4, UDP6 and UDPD Mode, if the sending DATA exceeds MSS(Maximum Segment Size),

the sending DATA is automatically divided by MSS and transmitted.

* In IPRAW4, IPRAW6 and MACRAW Mode, HOST must divide DATA by MSS.

* In TCP4, TCP6 and TCPD Mode, if SOCKET could not successfully send DATA (no receives ACK Packet) to

Destination, SOCKET will be closed and Sn_IR[TIMEOUT] & Sn_SR[SOCK_CLOSED] occurs.

* In TCP4, TCP6, TCPD, UDP4, UDP6, UDPD, IPRAW4, IPRAW6 and MACRAW Mode, Sn_TX_FSR is increased by sent

DATA Size after Sn_IR[SENDOK] = ‘1’.

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