W5300 datasheet(83/128 Pages) WIZNET

83 / 128 page

KA packet can be transmitted after Sn_SSR is changed to SOCK_ESTABLISHED and more

than one time DATA packet transmitting or receiving. In case of 'Sn_KPALVTR > 0', W5300

automatically transmits KA packet after time-period, and checks TCP connection (Auto-keep-

alive-process). In case of 'Sn_KPALVTR = 0', Auto-keep-alive-process does not operate, and KA

packet can be transmitted by SEND_KEEP command by the host (Manual-keep-alive-process).

Manual-keep-alive-process is ignored in case of 'Sn_KPALVTR > 0'

Ex) In case of 'Sn_KPALVTR = 10', KA packet is transmitted every 50s.

Sn_PROTOR(0x0821A+0x40n/0x21A+0x040n)

Sn_KPALVTR(0x0821A+0x40n/0x21A+0x040n)

Sn_PROTOR (0x0821B+0x40n/0x21B+0x040n)

10 (0x0A)

Sn_PROTOR

Sn_PROTOR (SOCKETn Protocol Number Register)[R/W]

[0x0821B+0x40n/0x21B+0x40n] [0x00]

It is 1 byte register that sets protocol number field of IP header at the IP layer.

It is valid only in IPRAW mode, and ignored in other modes. Sn_PROTOR is set before OPEN

command. SOCKETn opened as IPRAW mode, transmits and receives the data of protocol

number set in Sn_PROTOR. Sn_PROTOR can be assigned in the range of 0x00 ~ 0xFF, but

W5300 does not support TCP(0x06) and UDP(0x11) protocol number

Protocol number is defined in IANA(Internet assigned numbers authority). For the detail, refer to

online document (http://www.iana.org/assignments/protocol-numbers).

Ex) Sn_PROTOR = 0x01 (ICMP)

Sn_PROTOR(0x0821A+0x40n/0x21A+0x040n)

Sn_KPALVTR(0x0821A+0x40n/0x21A+0x040n)

Sn_PROTOR (0x0821B+0x40n/0x21B+0x040n)

Sn_KPALVTR

0x01

Sn_TOSR (SOCKETn TOS Register) [R/W] [0x0821C+0x40n/0x21C+40n] [0x00]

It sets TOS(Type of Service) field of IP header at the IP layer. It should be set before OPEN

command. Refer to http://www.iana.org/assignments/ip-parameters.

Ex) Sn_TOSR = 0x00

Sn_TOSR(0x0821C+0x40n/0x21C+0x040n)

Sn_TOSR0(0x0821C+0x40n/0x21C+0x040n)

Sn_TOSR1(0x0821D+0x40n/0x21D+0x040n)

Reserved

0x00

W5300 Datasheet(PDF) 83 Page - WIZnet Co., Ltd