W5300 datasheet(64/128 Pages) WIZNET

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UIPR (Unreachable IP Address Register) [R] [0x08048/0x048] [00.00.00.00]

UPORTR (Unreachable Port Register) [R] [0x0804C/0x04C] [0x0000]

When trying to transmit UDP data to destination port number which is not open, W5300 can

receive ICMP (Destination port unreachable) packet. In this case, I

R(DPUR) becomes ‘1’ and

destination IP address and unreachable port number of ICMP packet can be acquired through

UIPR and UPORTR.

Ex1) UIPR = 192.168.0.11

UIPR(0x08048/0x048)

UIPR2(0x0804A/0x04A)

UIPR0(0x08048/0x048)

UIPR1(0x08049/0x049)

UIPR2(0x0804A/0x04A)

UIPR3(0x0804B/0x04B)

192 (0xC0)

168 (0xA8)

0 (0x00)

11 (0x0B)

Ex2) UPORT = 5000(0x1388)

UPORTR(0x0804C/0x04C)

UPORTR0(0x0804C/0x04C)

UPORTR1(0x0804D/0x04D)

0x13

0x18

FMTUR (Fragment MTU Register) [R] [0x0804E/0x04E] [0x0000]

When communicating with the peer having a different MTU, W5300 can receive an

ICMP(Fragment MTU) packet. At this case, IR(FMTU) becomes ‘1’ and destination IP address

and fragment MTU value of ICMP packet can be acquired through UIPR and FMTUR. In order

to keep communicating with the peer having Fragment MTU, set the FMTUR first in Sn_MSSR

of the SOCKETn, and try the next communication.

Ex) FMTUR = 512(0x200)

FMTUR(0x0804E/0x04E)

FMTUR0(0x0804E/0x04E)

FMTUR1(0x0804F/0x04F)

0x02

0x00

Pn_BRDYR (PIN "BRDYn" Configure Register) [R/W] [0x08060+4n/0x060+4n] [0x--00]

It configures the PIN "BRDYn" which is monitoring TX/RX memory status of the specified

SOCKET. If the free buffer size of TX memory is same or bigger than the buffer depth of

Pn_BDPTHR, or received buffer size of RX memory is same or bigger than the Pn_BDPTHR,

PIN "BRDYn" is signaled.

W5300 Datasheet(PDF) 64 Page - WIZnet Co., Ltd