Hardware Accessed Words; Ethernet Address (Words 02H:00H); Initialization Control Word 1 (Word 0Ah) - Intel 82571EB EEPROM Information Manual

Word
Flexible
Size up to
7Eh
1 Word
Flexible
Size
1.7

Hardware Accessed Words

This section describes the EEPROM words that are loaded by the 82571EB/82572EI hardware.
Most of these bits are located in configuration registers. The words are only read and used if the
Signature field in the EEPROM Sizing & Protected fields (word 12h) is valid.
Note: When changing a default value of a reserved bit, 82571EB/82572EI behavior is undefined.
1.7.1

Ethernet Address (Words 02h:00h)

The Ethernet Individual Address (IA) is a 6-byte field that must be unique for each Ethernet port
and 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) after resets and after being
in D3.
The Ethernet address is loaded for LAN0 and bit 41, the least significant bit of the last Ethernet
address byte, and is inverted (bit 8 of Word 2) for LAN1
Note: A default value of FFFFh means the word is not used for any purpose.
Table 3. IA Byte Ordering Convention
Example 1 (Intel Original)
Example 2 (Intel New)
1.7.2

Initialization Control Word 1 (Word 0Ah)

The first word read by the 82571EB/82572EI contains initialization values that:
•
Sets defaults for some internal registers
•
Enables/disables specific features
•
Determines which PCI configuration space values are loaded from the EEPROM
1. LAN1 is not applicable to the 82572EI.
Used
15
By
FW
Flex
Filter
FW
Flex
Filter
IA Byte / Value
Vendor 1
00
00
82571EB/82572EI EEPROM Information Guide
8 7
Flexible Filter Data
Flexible Filter Length
Reserved
1
.
2 3
AA 00 Variable
A0 C9 Variable
Image
0 Function
Value
both
both
4 5 6
Variable Variable
Variable Variable
7