82801BA Datasheet, PDF (370/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

USB Controller Registers
11.1.7
SCC—Sub Class Code Register (USB—D31:F2/F4)
Address Offset:
0Ah
Default Value:
03h
Attribute:
Size:
RO
8 bits
Bit
Description
Sub Class Code—RO.
7:0
03h = Universal Serial Bus Host Controller.
11.1.8
BCC—Base Class Code Register (USB—D31:F2/F4)
Address Offset:
0Bh
Default Value:
0Ch
Attribute:
Size:
RO
8 bits
Bit
Base Class Code—RO.
7:0
0Ch = Serial Bus controller.
Description
11.1.9
BASE—Base Address Register (USB—D31:F2/F4)
Address Offset:
Default Value:
20–23h
00000001h
Attribute:
Size:
R/W
32 bits
Bit
31:16
15:5
4:1
0
Description
Reserved.
Base Address—R/W. Bits [15:5] correspond to I/O address signals AD [15:5], respectively. This
gives 32 bytes of relocatable I/O space.
Reserved.
Resource Type Indicator (RTE)—RO. This bit is hardwired to 1 indicating that the base address
field in this register maps to I/O space
11.1.10
SVID—Subsystem Vendor ID (USB—D31:F2/F4)
Address Offset:
Default Value:
Lockable:
2Ch–2Dh
00h
No
Attribute:
Size:
Power Well:
RO
16 bits
Core
Bit
Description
Subsystem Vendor ID (SVID)—RO. The SVID register, in combination with the Subsystem ID
15:0
(SID) register, enables the operating system (OS) to distinguish subsystems from each other. The
value returned by reads to this register is the same as that which was written by BIOS into the
IDE_SVID register.
11-4
82801BA ICH2 and 82801BAM ICH2-M Datasheet