W5100 datasheet(29/72 Pages) WIZNET

29 / 72 page

SERVER mode.

* In case of using CLOSE command instead of DISCON, only the value of

Socket n Status Register(Sn_SR) is changed to SOCK_CLOSED without

the connection termination process.

0x10

It is used to close the socket. It changes the value of Socket n Status

0x20

SEND

It transmits the data as much as the increased size of Socket n TX Write

Pointer. For more detail, refer to Socket n TX Free Size Register

(Sn_TX_FSR), Socket n TX Write Pointer Register(Sn_TX_WR), and Socket

n TX Read Pointer Register(Sn_TX_RR) or 5.2.1.1. SERVER mode.

0x21

SEND_MAC

It is used in UDP mode.

The basic operation is same as SEND. Normally SEND operation needs

Destination Hardware Address that is received in ARP(Address Resolution

Protocol) process. SEND_MAC uses Socket n Destination Hardware

Address(Sn_DHAR) that is written by users without ARP process.

0x22

SEND_KEEP

It is only used in TCP mode.

It checks the connection status by sending 1byte data. If the connection

is already terminated or peer has no response, Timeout interrupt will

occur.

0x40

RECV

Receiving is processed with the value of Socket n RX Read Pointer

For more detail, refer to 5.2.1.1 SERVER mode Receiving Process with

Socket n RX Received Size Register (Sn_RX_RSR), Socket n RX Write

Pointer

and

Socket

Read

Pointer

Sn_IR (Socket n Interrupt Register) [R] [0x0402, 0x0502, 0x0602, 0x0702] [0x00]

This register is used for notifying connection establishment and termination, receiving data

and Timeout. The Socket n Interrupt Register must be cleared by writing ‘1’.

Reserved

SEND_OK

TIMEOUT

RECV

DISCON

CON

Bit

Symbol

Description

Reserved

W5100 Datasheet(PDF) 29 Page - WIZnet Co., Ltd

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