Data Sheet

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iEthernet

W5200

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

Above three cases, Sn_SR is changed to SOCK_CLOSED.

0x08

DISCON

Only valid in TCP mode

Regardless of “TCP SERVER” or “TCP CLIENT”, this disconnect command

processes the

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

connected peer

Passive close: When FIN packet is received from peer, a FIN packet is

replied back to the peer

when FIN/ACK packet is received, Sn_SR is changed to SOCK_CLOSED.

When a disconnect request is not received, TCPTO occurs (Sn_IR(3)=’1’)

and Sn_SR is changed to SOCK_CLOSED.

cf> If CLOSE is used instead of DISCON, only Sn_SR is changed to

SOCK_CLOSED without disconnect-process(disconnect-request). If a RST

packet is received from a peer during communication, Sn_SR is

unconditionally changed to SOCK_CLOSED.

0x10

Closes Socket n .

Sn_SR is changed to SOCK_CLOSED.

0x20

SEND

SEND transmits all the data buffered in the TX memory. For more details,

please refer to Socket n TX Free Size Register (Sn_TX_FSR0), Socket n

TX Write Pointer Register(Sn_TX_WR0), and Socket n TX Read Pointer

0x21

SEND_MAC

Used in UDP mode only

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

Destination Hardware Address which can be retrieved by the ARP

(Address Resolution Protocol) process. SEND_MAC uses Socket n

Destination Hardware Address(Sn_DHAR0) that is chosen by the user

without going through the ARP process.

0x22

SEND_KEEP

Used in TCP mode

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

has no response from peers or is terminated, the Timeout interrupt will

occur.

0x40

RECV

RECV processes the data received by using a RX read pointer

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

with Socket n RX Received Size Register (Sn_RX_RSR0), Socket n RX

Write Pointer Register(Sn_RX_WR), and Socket n RX Read Pointer