W5200 datasheet(32/88 Pages) WIZNET

32 / 88 page

0X1B

SOCK_TIME_WAIT

It is changed to SOCK_CLOSED, when disconnect-process is

successfully finished or TCPTO occurs (Sn_IR (TIMEOUT)

=‘1’).

0X1D

SOCK_LAST_ACK

In case of Passive closing,this status indicate that W5200

waits ACK for FIN packet. It is changed to SOCK_ CLOSED,

when Timeout Interrupt occurs (Sn_IR(TIMEOUT)=‘1').

0x01

SOCK_ARP

This status indicates that ARP-request is transmitted in

order to acquire destination hardware address. This status

is observed when SEND command is performed at the

SOCK_UDP or SOCK_IPRAW, or CONNECT command is

performed at the SOCK_INIT.

If hardware address is successfully acquired from

destination (when ARP-response is received), it is changed

to SOCK_UDP, SOCK_IPRAW or SOCK_SYNSENT. If it's failed

and ARPTO occurs (Sn_IR(TIMEOUT)=‘1’), in case of UDP or

IPRAW mode it goes back to the previous status(the

SOCK_UDP or SOCK_IPRAW), in case of TCP mode it goes to

the SOCK_CLOSED.

cf> ARP-process operates at the SOCK_UDP or SOCK_IPRAW

when the previous and current values of Sn_DIPR are

different. If the previous and current values of Sn_DIPR are

same,

ARP-process

doesn’t

operate

because

the

destination hardware address is already acquired.

W5200 Datasheet(PDF) 32 Page - WIZnet Co., Ltd