316972-004 Datasheet, PDF (415/884 Pages) Intel Corporation – Intel I/O Controller Hub 9

Gigabit LAN Configuration Registers
12.1.5
RID—Revision Identification Register
(Gigabit LAN—D25:F0)
Offset Address: 08h
Default Value: See bit description
Attribute:
Size:
RO
8 bits
12.1.6
Bit
Description
7:0
Revision ID — RO. Refer to the Intel^® I/O Controller Hub (ICH9) Family Specification
Update for the value of the Revision ID Register
CC—Class Code Register
(Gigabit LAN—D25:F0)
Address Offset: 09h–0Bh
Default Value: 020000h
Attribute:
Size:
RO
24 bits
12.1.7
Bit
23:0
Description
Class Code— RO. Identifies the device as an Ethernet Adapter.
020000h = Ethernet Adapter.
CLS—Cache Line Size Register
(Gigabit LAN—D25:F0)
Address Offset: 0Ch
Default Value: 00h
Attribute:
Size:
R/W
8 bits
12.1.8
Bit
Description
7:0
Cache Line Size — R/W. This field is implemented by PCI devices as a read write field
for legacy compatibility purposes but has no impact on any device functionality.
PLT—Primary Latency Timer Register
(Gigabit LAN—D25:F0)
Address Offset: 0Dh
Default Value: 00h
Attribute:
Size:
RO
8 bits
12.1.9
Bit
Description
7:0 Latency Timer (LT) — RO. Hardwired to ‘0’.
HT—Header Type Register
(Gigabit LAN—D25:F0)
Address Offset: 0Eh
Default Value: 00h
Attribute:
Size:
RO
8 bits
Bit
Description
Header Type (HT) — RO.
7:0
00h = Indicates this is a single function device.
Intel^® I/O Controller Hub 9 (ICH9) Family Datasheet
415