82801FB Datasheet, PDF (512/786 Pages) Intel Corporation – Intel I/O Controller Hub 6 (ICH6) Family

UHCI Controllers Registers
13.1.12
SVID — Subsystem Vendor Identification Register
(USB—D29:F0/F1/F2/F3)
Address Offset:
Default Value:
Lockable:
2Ch–2Dh
0000h
No
Attribute:
Size:
Power Well:
R/WO
16 bits
Core
Bit
Description
Subsystem Vendor ID (SVID) — R/WO. BIOS sets the value in this register to identify the
Subsystem Vendor ID. The USB_SVID register, in combination with the USB Subsystem ID register,
enables the operating system to distinguish each subsystem from the others.
15:0
NOTE: The software can write to this register only once per core well reset. Writes should be done
as a single, 16-bit cycle.
13.1.13 SID — Subsystem Identification Register
(USB—D29:F0/F1/F2/F3)
Address Offset:
Default Value:
Lockable:
2Eh–2Fh
0000h
No
Attribute:
Size:
Power Well:
R/WO
16 bits
Core
Bit
Description
Subsystem ID (SID) — R/WO. BIOS sets the value in this register to identify the Subsystem ID. The
SID register, in combination with the SVID register (D29:F0/F1/F2/F3:2C), enables the operating
system to distinguish each subsystem from other(s). The value read in this register is the same as
15:0 ^{what was written to the IDE_SID register.}
NOTE: The software can write to this register only once per core well reset. Writes should be done
as a single, 16-bit cycle.
13.1.14 INT_LN—Interrupt Line Register
(USB—D29:F0/F1/F2/F3)
Address Offset:
3Ch
Default Value:
00h
Attribute:
Size:
R/W
8 bits
Bit
Description
7:0
Interrupt Line (INT_LN) — RO. This data is not used by the ICH6. It is to communicate to software
the interrupt line that the interrupt pin is connected to.
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Intel^® I/O Controller Hub 6 (ICH6) Family Datasheet