INTEL82801 Datasheet, PDF (195/414 Pages) Intel Corporation – 82801AB (ICH0) I/O Controller Hub

LPC Interface Bridge Registers (D31:F0)
8.1.5
8.1.6
8.1.7
8.1.8
8.1.9
RID—Revision ID Register (LPC I/F—D31:F0)
Offset Address: 08h
Default Value: See ICH Spec. Updates
Attribute:
Size:
RO
8 bits
Bit
Description
7:0
Revision Identification Number. 8-bit value that indicates the revision number for the LPC bridge.
Refer to ICH Specification Updates for this value.
PI—Programming Interface (LPC I/F—D31:F0)
Address Offset: 09h
Default Value: 00h
Attribute:
Size:
RO
8 bits
Bit
7:0 Programming Interface Value.
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. 8-bit value that 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. 8-bit value that 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. This bit is ‘1’ to indicate a multi-function device.
6:0 Header Type. 8-bit field identifies the header layout of the configuration space.
82801AA and 82801AB Datasheet
8-5