W5100S datasheet(42/110 Pages) WIZNET

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W5100S Datasheet Version1.2.5

(Ref 4.3.2 TCP Client)

0x08

DISCON

TCP DISCON Command

After DISCON Command, TCP Mode SOCKET transmits FIN Packet to Peer

for TCP Disconnection in SOCK_ESTABLESHED (Sn_SR = ‘0x17’) or

SOCK_CLOSE_WAIT (Sn_SR = ‘0x1C’).

0x10

SOCKET CLOSE Command

After CLOSE Command, SOCKET is closed (Sn_SR = ‘0x00’).

*Caution : Sn_SR is changed to SOCK_CLOSE without FIN Packet sending in TCP

Mode

0x20

SEND

SOCKET SEND Command

After SEND Command, SOCKET sends Data as much as the calculated size

between Sn_TX_WR (SOCKET n TX Write Point Register) and Sn_TX_RD

(SOCKET n RX Read Pointer Register). The Sent Data must not be

exceeded Sn_RX_FSR (SOCKET n TX Free Buffer Size Register). HOST

must execute next SEND Command after Sn_IR [SENDOK] is set to ‘1’.

On TCP and UDP Mode, if the calculated size is over MSS (Maximum

Segment Size), Data is separated by MSS and sent.

On the other hands, on IPRAW and MACRAW Mode, if Data is over MSS,

HOST must separate it by less than MSS.

On TCP Mode, if Peer receives Data (It means TCP Mode SOCKET receives

ACK Packet from Peer), Sn_RX_FSR is automatically increased by sent

Data Size. But if not, Sn_IR [TIMEOUT] is set to ‘1’ and Sn_SR is changed

to SOCK_CLOSED.

On UDP, IPRAW and MACRAW Mode, Sn_TX_FSR is increased by sent Data

Size after Sn_IR [SENDOK] is set to ‘1’.

0x21

SEND_MAC

SOCKET SEND_MAC Command

SEND_MAC Command is used only on UDP and IPRAW Mode. Only the

different with SEND Command is that it skips ARP Process. Before using

SEND_MAC Command, HOST must set Sn_DHAR (SOCKET n Destination

Hardware Address Register) with Peer MAC Address.

0x22

SEND_KEEP

SOCKET SEND_KEEP Command

SEND_KEEP Command is used only on TCP Mode. Before using SEND_KEEP

Command, TCP Mode SOCKET must send more than 1 byte Data to Peer.

After SEND_KEEP Command, TCP Mode SOCKET continues to send Keep

alive (KA) Packet and check the TCP connection. If there is no Peer

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