82801DB Datasheet, PDF (403/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

USB UHCI Controllers Registers
11.1.10
BASE—Base Address Register (USB—D29:F0/F1/F2)
Address Offset:
Default Value:
20–23h
00000001h
Attribute:
Size:
R/W, RO
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
11.1.11
SVID — Subsystem Vendor ID (USB—D29:F0/F1/F2)
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 what was written by BIOS into the IDE_SVID
register.
11.1.12
SID — Subsystem ID (USB—D29:F0/F1/F2)
Address Offset:
Default Value:
Lockable:
2Eh–2Fh
00h
No
Attribute:
Size:
Power Well:
RO
16 bits
Core
Bit
Description
Subsystem ID (SID) — R/Write-Once. The SID register, in combination with the SVID register,
15:0 enables the operating system (OS) to distinguish subsystems from each other. The value returned
by reads to this register is the same as what was written by BIOS into the IDE_SID register.
Intel^® 82801DB ICH4 Datasheet
403