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Intel
®
82575EB Gigabit Ethernet Controller — Mandatory PCI Configuration Registers
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
190 January 2011
Note: The following color notation is used for reference:
Interpretation of the various 82575 registers is provided as follows.
Vendor ID
This is a read only register that has the same value for all PCI functions. It identifies uniquely Intel
products. The field can be automatically loaded from the EEPROM at address 0Eh during initialization
with a default value of 8086h.
Device IDs
This is a read-only register. This field identifies individual 82575 functions. It has the same default value
for the two LAN functions but can be auto-loaded from the EEPROM during initialization with a different
value for each port. The following table lists the possible values according to the SKU and functionality
of each function.
Note: Refer to the 82575 Specification Update for supported device IDs.
Command
This is a read/write register. Its layout follows. Shaded bits are not used by this implementation and are
hard wired to 0b. Each function has its own Command register. Unless explicitly specified, functionality
is the same in all functions.
Table 61. PCI Compatible Configuration Registers
Byte
Offset
Byte 3 Byte 2 Byte 1 Byte 0
0h
Device ID Vendor ID (8086h)
4h Status Register (0010h) Command Register (0000h)
8h
Class Code (020000h, 010185h, 070002h, 0C0701h) Revision ID (02h)
Ch
(00h) Header Type
(00h, 80h)
Latency Timer (00h) Cache Line Size (10h)
10h Base Address 0
14h Base Address 1
18h Base Address 2
1Ch Base Address 3
20h Base Address 4
24h Base Address 5
28h
CardBus CIS Pointer (00000000h)
2Ch
Subsystem ID (0000h) Subsystem Vendor ID (8086h)
30h Expansion ROM Base Address
34h
Reserved (000000h) Cap_Ptr (C8h)
38h
Reserved (00000000h)
3Ch
Max_Latency (00h) Min_Grant
(00h)
Interrupt Pin
(01h)
Interrupt Line
(00h)
Fields identical to all functions.
Read only fields.
Hard coded fields.