W5500 Datasheet, PDF (40/65 Pages) List of Unclassifed Manufacturers – Supports 8 independent sockets simultaneously

PHAR (Destination Hardware Address Register in PPPoE mode)
[R/W] [0x001E-0x0023] [0x0000]
PHAR should be written to the PPPoE server hardware address acquired in PPPoE
connection process
Ex) In case that destination hardware address is 00:08:DC:12:34:56
0x001E
0x001F
0x0020
0x0021
0x0022
0x00
0x08
0xDC
0x12
0x34
0x0023
0x56
PSID (Session ID Register in PPPoE mode) [R/W] [0x0024-0x0025] [0x0000]
PSID should be written to the PPPoE sever session ID acquired in PPPoE connection
process.
Ex) In case that Session ID is 0x1234
0x0024
18 (0x12)
0025
52(0x34)
PMRU (Maximum Receive Unit in PPPoE mode) [R/W] [0x0026-0x0027] [0xFFFF]
PMRU configures the maximum receive unit of PPPoE.
Ex) in case that maximum receive unit in PPPoE is 0x1234
0x0026
0027
18 (0x12)
52 (0x34)
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W5500 Datasheet Version1.0 (August 2013)