Intel PCI-X manual Ethernet Address Words 00h-02h, Software Compatibility Word Word 03h

EEPROM Interface

5.6.1Ethernet Address (Words 00h-02h)

The Ethernet Individual Address (IA) is a six-byte field that must be unique for each Ethernet port (and unique for each copy of the EEPROM image). The first three bytes are vendor specific. The value from this field is loaded into the Receive Address Register 0 (RAL0/RAH0). For a MAC address of 12-34-56-78-90-AB, words 2:0 load as follows (note that these words are byte- swapped):

Word 0 = 3412

Word 1 = 7856

Word 2 - AB90

Note: Since the 82546GB/EB is a dual-port device, the Ethernet Address in these words are assigned to LAN A. The Ethernet Address for LAN B is the Ethernet Address for LAN A with its least significant bit inverted.

5.6.2Software Compatibility Word (Word 03h)

This is the third word read by the Ethernet controller and contains additional initialization values that:

•Sets defaults for some internal registers

•Enables/disables specific features

Note: For the 82544GC/EI, typical values are 0000h for a fiber-based design and 0400h for a copper- based design.

Table 5-4. Software Compatibility Word (Word 03h)

Bit	Name	Description
15:12	Reserved	Reserved for future use.
11	LOM	LAN on Motherboard (LOM#). Set this bit to 1b (default) to enable LOM#;
		set to 0b to disable LOM#.
		Server card. Set this bit to 1b (default) to enable server card; set to 0b to
10	SRV	disable server card.
		0b is the default setting for the 82541xx and 82547GI/EI.
		Client card. Set this bit to 0b (default) to disable client card; set to 1b to
9	CLI	enable client card.
		1b is the default setting for the 82541xx and 82547GI/EI.
8	OEM	OEM card. Set this bit to 1b (default) to enable OEM card; set to 0b to
		disable OEM card.
7:6	Reserved	Reserved for future use. Set these bits to 0b.
		Reserved for future use.
5	Reserved	Set this bit to 1b.
		Set this bit to 0b for the 82540EP/EM, 82541xx and 82547GI/EI.
4	SMBa	SMBus. Set this bit to 1b (default) to enable SMBus; set to 0b to disable
		SMBus.

Software Developer’s Manual 103