W5100 datasheet(28/72 Pages) WIZNET

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It is applied only in case of MULTI bit is ‘1’

Reserved

Protocol

Sets up corresponding socket as TCP, UDP, or IP RAW mode

Meaning

Closed

TCP

UDP

IPRAW

* In case of socket 0, MACRAW and PPPoE mode exist.

Meaning

MACRAW

PPPoE

Sn_CR (Socket n Command Register) [R/W] [0x0401, 0x0501, 0x0601, 0x0701] [0x00]

This register is utilized for socket n initialization, close, connection establishment,

termination, data transmission and command receipt. After performing the commands, the

Value

Symbol

Description

0x01

OPEN

It is used to initialize the socket. According to the value of Socket n

Mode Register (Sn_MR), Socket n Status Register(Sn_SR) value is

changed to SOCK_INIT, SOCK_UDP, SOCK_IPRAW, or SOCK_MACRAW.

For more detail, refer to 5. Functional Description.

0x02

LISTEN

It is only used in TCP mode.

It changes the value of Socket n Status Register (Sn_SR) to SOCK_LISTEN

in order to wait for a connection request from any remote peer (TCP

Client).

For more detail, refer to 5.2.1.1 SERVER mode.

0x04

CONNECT

It is only used in TCP mode.

It sends a connection request to remote peer(TCP SERVER). If the

connection is failed, Timeout interrupt will occur.

For more detail, refer to 5.2.1.2 CLIENT mode.

0x08

DISCON

It is only used in TCP mode.

It sends a connection termination request. If connection termination is

failed, Timeout interrupt will occur. For more detail, refer to 5.2.1.1

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