Intel PCI-X, Intel Gigabit Ethernet Controllers manual Offset Field Value Action Comment Bytes

Power Management

Offset	# of	Field	Value	Action	Comment
	bytes
0	6	Destination Address		Compare	MAC Header –
					processed by main
6	6	Source Address		Skip
					address filter
12a	8	Possible LLC/SNAP Header		Skip
12a	4	Possible VLAN Tag		Skip
12a	4	Type		Skip
any	6	Synchronizing Stream	FF*6+	Compare
					Compared to Receive
any+6	96	16 copies of Node Address	A*16	Compare	Address Register 0
					(RAH0, RAL0)

a.Not applicable to the 82541PI/GI/EI and 82547GI/EI.

A Magic Packet’s destination address must match the address filtering enabled in the configuration registers with the exception that broadcast packets are considered to match even if the Broadcast Accept bit of the Receive Control Register (RCTL.BAM) is 0b. If APM Wakeup is enabled in the EEPROM, Ethernet controller starts up with the Receive Address Register 0 (RAH0, RAL0) loaded from the EEPROM. This is enables it to accept packets with the matching IEEE address before the driver comes up.

Note: Accepting broadcast magic packets for wakeup purposes when the Broadcast Accept bit of the Receive Control Register (RCTL.BAM) is 0b is a change from the 82544GC/EI Ethernet controller, which initialized RCTL.BAM to 1b if APM was enabled in the EEPROM, but then required that bit to be 1b to accept broadcast Magic Packets, unless broadcast packets passed another perfect or multicast filter.

Software Developer’s Manual 145