W5300 datasheet(86/128 Pages) WIZNET

86 / 128 page

Sn_RX_RSR automatically decreases by 2bytes whenever the host reads Sn_RX_FIFOR.

In case of 'Sn_RX_RSR > 0', there is one or more DATA packet in internal RX memory. And the

received data should be processed in DATA packet unit. Refer to Sn_RX_FIFOR.

Ex1) Sn_RX_RSR = 64KB = 65536 = 0x00010000

Sn_RX_RSR(0x08228+0x40n/0x228+0x040n)

Sn_RX_RSR0(0x08228+0x40n/0x21C+0x040n)

Sn_RX_RSR1(0x08229+0x40n/0x229+0x040n)

Reserved

‘1’

Sn_RX_RSR2(0x0822A+0x40n/0x22A+0x040n)

Sn_RX_RSR3(0x0822B+0x40n/0x22B+0x040n)

0x00

Ex2) Sn_RX_RSR = 3800 = 0x00000ED8

Sn_RX_RSR(0x08228+0x40n/0x228+0x040n)

Sn_RX_RSR0(0x08228+0x40n/0x21C+0x040n)

Sn_RX_RSR1(0x08229+0x40n/0x229+0x040n)

Reserved

‘0’

Sn_RX_RSR2(0x0822A+0x40n/0x22A+0x040n)

Sn_RX_RSR3(0x0822B+0x40n/0x22B+0x040n)

0x0E

0xD8

Sn_FRAGR (SOCKETn Fragment Register) [R/W] [0x0822C+0x40n/0x22C+0x40n] [0x40]

It sets the fragment field of the IP header at the IP layer. W5300 does not support the packet

fragment at the IP layer. Even though Sn_FRAGR is configured, IP data is not fragmented. And

its configuration is not recommended.

It should be configured before performing OPEN

command.

Ex) Sn_FRAG

R = 0x40 (Don’t Fragment)

Sn_FRAGR(0x0822C+0x40n/0x22C+0x040n)

Sn_FRAGR0(0x0822C+0x40n/0x22C+0x040n)

Sn_FRAGR1(0x0822D+0x40n/0x22D+0x040n)

Reserved

0x40

Sn_TX_FIFOR

(SOCKETn

TX FIFO

[R/W]

[0x0822E+0x40n/0x22E+0x40n]

[0xUUUU]

It indirectly accesses internal TX memory of SOCKETn.

The internal TX memory can't be accessed directly by the host, but can be accessed through

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