82801DB Datasheet, PDF (295/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LPC Interface Bridge Registers (D31:F0)
9.1.6
9.1.7
9.1.8
9.1.9
PI—Programming Interface (LPC I/F—D31:F0)
Offset Address: 09h
Default Value: 00h
Attribute:
Size:
RO
8 bits
Bit
7:0 Programming Interface Value — RO.
Description
SCC—Sub-Class Code Register (LPC I/F—D31:F0)
Offset Address: 0Ah
Default Value: 01h
Attribute:
Size:
RO
8 bits
Bit
Description
7:0 Sub Class Code — RO. This 8-bit value indicates the category of bridge for the LPC PCI bridge.
BCC—Base-Class Code Register (LPC I/F—D31:F0)
Offset Address: 0Bh
Default Value: 06h
Attribute:
Size:
RO
8 bits
Bit
Description
7:0
Base Class Code — RO. This 8-bit value indicates the type of device for the LPC bridge. The code is
06h indicating a bridge device.
HEADTYP—Header Type Register (LPC I/F—D31:F0)
Offset Address: 0Eh
Default Value: 80h
Attribute:
Size:
RO
8 bits
Bit
Description
7 Multi-Function Device — RO. This bit is 1 to indicate a multi-function device.
6:0 Header Type — RO. 7-bit field identifies the header layout of the configuration space.
Intel^® 82801DB ICH4 Datasheet
295