82801BA Datasheet, PDF (368/498 Pages) Intel Corporation – Intel 82801BA I/O Controller Hub 2 (ICH2) and Intel 82801BAM I/O Controller Hub 2 Mobile

USB Controller Registers
11.1.2
11.1.3
DID—Device Identification Register (USB—D31:F2/F4)
Address Offset:
Default Value:
02–03h
Function 2: 2442h
Function 4: 2444h
Attribute:
Size:
RO
16 bits
Bit
Description
15:0 Device ID Value—RO. This is a 16-bit value assigned to the ICH2 USB Host Controllers
CMD—Command Register (USB—D31:F2/F4)
Address Offset:
Default Value:
04–05h
0000h
Attribute:
Size:
R/W
16 bits
Bit
15:10
9
8
7
6
5
4
3
2
1
0
Description
Reserved.
Fast Back to Back Enable (FBE)—RO. Reserved as 0.
SERR# Enable—RO. Reserved as 0.
Wait Cycle Control—RO. Reserved as 0.
Parity Error Response—RO. Reserved as 0.
VGA Palette Snoop—RO. Reserved as 0.
Postable Memory Write Enable (PMWE)—RO. Reserved as 0.
Special Cycle Enable (SCE)—RO. Reserved as 0.
Bus Master Enable (BME)—R/W. When set, the ICH2 can act as a master on the PCI bus for USB
transfers.
Memory Space Enable (MSE)—RO. Reserved as 0.
I/O Space Enable (IOSE)—R/W. This bit controls access to the I/O space registers.
1 = Enable accesses to the USB I/O registers. The Base Address register for USB should be
programmed before this bit is set.
0 = Disable
11-2
82801BA ICH2 and 82801BAM ICH2-M Datasheet