82801BA Datasheet, PDF (385/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

SMBus Controller Registers (D31:F3)
12.1.5
12.1.6
12.1.7
12.1.8
RID—Revision ID Register (SMBUS—D31:F3)
Offset Address: 08h
Default Value: See bit description
Attribute:
Size:
RO
8 bits
Bit
Description
7:0
Revision Identification Number. 8-bit value that indicates the revision number for the SMBus
Controller. Refer to the Specification Update for the value of the Revision ID Register
PI—Programming Interface (SMBUS—D31:F3)
Address Offset: 09h
Default Value: 80h
Attribute:
Size:
RO
8 bits
Bit
Description
Programming Interface Value—RO.
7:0
80h = The 1b in bit 7 indicates that this IDE controller is capable of bus master operation.
SCC—Sub Class Code Register (SMBUS—D31:F3)
Address Offset: 0Ah
Default Value: 05h
Attributes:
Size:
RO
8 bits
Bit
Sub Class Code—RO.
7:0
05h = SM Bus serial controller
Description
BCC—Base Class Code Register (SMBUS—D31:F3)
Address Offset: 0Bh
Default Value: 0Ch
Attributes:
Size:
RO
8 bits
Bit
Base Class Code—RO.
7:0
0Ch = Serial controller.
Description
82801BA ICH2 and 82801BAM ICH2-M Datasheet
12-3