307013-003 Datasheet, PDF (670/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

PCI Express* Configuration Registers (Desktop and Mobile Only)
18.1.8
BCC—Base Class Code Register
(PCI Express—D28:F0/F1/F2/F3/F4/F5)
Address Offset: 0Bh
Default Value: 06h
Attribute:
Size:
RO
8 bits
18.1.9
Bit
Description
Base Class Code (BCC) — RO.
7:0
06h = Indicates the device is a bridge device.
CLS—Cache Line Size Register
(PCI Express—D28:F0/F1/F2/F3/F4/F5)
Address Offset: 0Ch
Default Value: 00h
Attribute:
Size:
R/W
8 bits
Bit
Description
7:0
Base Class Code (BCC) — R/W. This is read/write but contains no functionality, per the
PCI Express* Base Specification.
18.1.10 PLT—Primary Latency Timer Register
(PCI Express—D28:F0/F1/F2/F3/F4/F5)
Address Offset: 0Dh
Default Value: 00h
Attribute:
Size:
RO
8 bits
Bit
Description
7:3 Latency Count. Reserved per the PCI Express* Base Specification.
2:0 Reserved
18.1.11 HEADTYP—Header Type Register
(PCI Express—D28:F0/F1/F2/F3/F4/F5)
Address Offset: 0Eh
Default Value: 81h
Attribute:
Size:
RO
8 bits
Bit
Description
Multi-Function Device — RO.
7 _{0 = Single-function device.}
1 = Multi-function device.
6:0 Configuration Layout. Hardwired to 01h, which indicates a PCI-to-PCI bridge.
670
Intel ^® ICH7 Family Datasheet