W5500 datasheet(49/66 Pages) WIZNET

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W5500 Datasheet Version1.0.9

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Sn_SR (Socket n Status Register) [R] [0x0003] [0x00]

Sn_SR indicates the status of Socket n. The status of Socket n is changed by Sn_CR

or some special control packet as SYN, FIN packet in TCP.

Value

Symbol

Description

0x00

SOCK_CLOSED

This indicates that Socket n is released.

When DISCON, CLOSE command is ordered, or when a timeout

occurs, it is changed to SOCK_CLOSED regardless of previous

status.

0x13

SOCK_INIT

This indicates Socket n is opened with TCP mode.

It is changed to SOCK_INIT when Sn_MR (P[3:0]) = ‘0001’ and

OPEN command is ordered.

After SOCK_INIT, user can use LISTEN /CONNECT command.

0x14

SOCK_LISTEN

This indicates Socket n is operating as ‘TCP server’ mode and

waiting for connection-request (SYN packet) from a peer

(‘TCP client’).

It will change to SOCK_ESTALBLISHED when the connection-

request is successfully accepted.

Otherwise it will change to SOCK_CLOSED after TCPTO

occurred (Sn_IR(TIMEOUT) = ‘1’).

0x17

SOCK_ESTABLISHED

This indicates the status of the connection of Socket n.

It changes to SOCK_ESTABLISHED when the ‘TCP SERVER’

processed the SYN packet from the ‘TCP CLIENT’ during

SOCK_LISTEN, or when the CONNECT command is successful.

During SOCK_ESTABLISHED, DATA packet can be transferred

using SEND or RECV command.

0x1C

SOCK_CLOSE_WAIT

This indicates Socket n received the disconnect-request (FIN

packet) from the connected peer. This is half-closing status,

and data can be transferred. For full-closing, DISCON

command is used. But For just-closing, CLOSE command is

used.

0x22

SOCK_UDP

This indicates Socket n is opened in UDP mode(Sn_MR(P[3:0])

= ‘0010’).

It changes to SOCK_UDP when Sn_MR(P[3:0]) = ‘0010’) and

OPEN command is ordered.

Unlike TCP mode, data can be transfered without the

connection-process.

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