82571EB/82572EI EEPROM Information Guide
7
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
1
.
Note:
A default value of FFFFh means the word is not used for any purpose.
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
Word
Used
By
15 8
7 0
Image
Value
Function
Flexible
Size up to
7Eh
FW
Flex
Filter
Flexible Filter Data
both
1 Word
FW
Flex
Filter
Flexible Filter Length
both
Flexible
Size
Reserved
1.
LAN1 is not applicable to the
82572EI
.
Table 3. IA Byte Ordering Convention
IA Byte / Value
Vendor
1
2
3
4
5
6
Example 1 (Intel Original)
00
AA
00
Variable
Variable
Variable
Example 2 (Intel New)
00
A0
C9
Variable
Variable
Variable
