W5300 datasheet(71/128 Pages) WIZNET

71 / 128 page

0x02

LISTEN

It is valid only in TCP mode(Sn_MR(P3:P0)=Sn_MR_TCP).

It operates SOCKETn as "TCP SERVER". It changes Sn_SSR to

SOCK_LISTEN at the SOCK_INIT in order to wait for connect-request

(SYN packet) from any "TCP CLIENT"

When Sn_SSR is SOCK_LISTEN and connect-request from a "TCP

CLIENT" is successfully processed, Sn_IR(0) becomes '1' and

Sn_SSR is changed to SOCK_ESTABLISHED. In case that the

connect-request is not processed (SYN/ACK transmission is failed),

TCPTO

occurs

(Sn_IR(3)='1')

and

Sn_SSR

changed

SOCK_CLOSED.

cf> If TCP connect-request port number of "TCP CLIENT" does not

exist, W5300 transmits RST packet and Sn_SSR is not changed.

0x04

CONNECT

Only valid in TCP mode.

It operates SOCKETn as "TCP CLIENT"

It transmits connect-request(SYN packet) to the "TCP SERVER"

designated with Sn_DIPR and Sn_DPORTR.

When connect-request is successfully processed (when receiving

SYN/ACK packet), Sn_IR(0) becomes '1', and Sn_SSR is changed to

SOCK_ESTABLISHED.

There are 3 cases if connect-request is failed

when

ARPTO occurs

(Sn_IR(3)='1')

because

Destination

Hardware Address is not acquired through ARP process

when SYN/ACK packet is not received and TCPTO (Sn_IR(3) is

'1'

When RST packet is received instead of SYN/ACK packet.

In above 3 cases, Sn_SSR is changed to SOCK_CLOSED.

0x08

DISCON

Only valid in TCP mode

Regardless of "TCP SERVER" or

“TCP CLINET”, it performs

disconnect-process.

Active close : it transmits disconnect-request(FIN packet) to

the connected peer.

W5300 Datasheet(PDF) 71 Page - WIZnet Co., Ltd

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