W5200 datasheet(30/88 Pages) WIZNET

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Sn_SR (Socket n Status Register) [R] [0x4003+0x0n00] [0x00]

This register provides the status of Socket n . SOCKET status are changed when using the Sn_CR

of Socket n .

Value

Symbol

Description

0x00

SOCK_CLOSED

It is the status that resource of SOCKETn is released. When

DISCON or CLOSE command is performed, or ARPTO, or

TCPTO occurs, it is changed to SOCK_CLOSED regardless of

previous value.

0x13

SOCK_INIT

It is shown in case that Sn_MR is set as TCP and OPEN

commands are given to Sn_CR. It is changed to SOCK_INIT

when Sn_MR (P3:P0) is Sn_MR_TCP and OPEN command is

performed. It is the initial step of TCP connection

establishment.

It is possible to perform LISTEN command at the "TCP

SERVER" mode and CONNECT command at the "TCP

CLIENT".

It is the status that SOCKETn operates as "TCP SERVER" and

waits for connect-request (SYN packet) from "TCP CLIENT".

0x14

SOCK_LISTEN

Socket n operates in TCP Server Mode and waits for a

connection-request (SYN packet) from a “TCP CLIENT”.

When the LISTEN command is used, the stage changes to

SOCK_LISTEN

Once the connection is established, the SOCKET state

changes

from

SOCK_LISTEN

SOCK_ESTABLISHED;

however,

the

connection

fails,

TCPTO

occurs

(Sn_IR(TIME_OUT) = ‘1’) and the state changes to

SOCK_CLOSED.

0x17

SOCK_ESTABLISHED It is shown in case that connection is established. It is

changed to SOCK_ESTABLISHED when SYN packet from

“TCP

CLIENT”

successfully

processed

the

SOCK_LISTEN, or CONNECTS command is successfully

performed. At this status, DATA packet can be transferred,

that is, SEND or RECV command can be performed.

0x1C

SOCK_CLOSE_WAIT

It is the status that disconnect-request (FIN packet) is

received from the peer As TCP connection is half-closed, it

is possible to transfer data packet. In order to complete

the TCP disconnection, DISCON command should be

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