SB82371 Intel Corporation, SB82371 Datasheet - Page 30

• Manufacturer Part Number: SB82371
• Description: 82371FB (PIIX) AND 82371SB (PIIX3) PCI ISA IDE XCELERATOR
• Manufacturer: Intel Corporation

82371FB (PIIX) AND 82371SB (PIIX3)
NOTE:
The base address is programmable via the BMIBA Register (20 23h; function 1)
** NOTE: These registers are WORD writeable only. Byte writes to these registers have unpredictable
effects.
30
I/O Address
Base + (00 01h)
Base + (02 03h)
Base + (04 05h)
Base + (06 07h)
Base + (08 0Bh)
Base + 0Ch
Base + (10 11h)
Base + (12 13h)
From Base
00h
01h
02h
03h
04–07h
08h
09h
0Ah
0Bh
0C–0Fh
Address
Offset
BMICP
—
BMISP
—
BMIDTPP
BMICS
—
BMISS
—
BMIDTPS
Mnemonic
USBCMD
USBSTS
USBINTR
FRNUM
FRBASEADD
SOFMOD
PORTSC1
PORTSC2
Mnemonic
Table 7. USB Host/Controller I/O Registers
Table 6. PCI Bus Master IDE I/O Registers
Bus Master IDE Command (primary)
Reserved
Bus Master IDE Status (primary)
Reserved
Bus Master IDE Descriptor Table Pointer (primary)
Bus Master IDE Command (secondary)
Reserved
Bus Master IDE Status (secondary)
Reserved
Bus Master IDE Descriptor Table Pointer (secondary)
USB Command
USB Status
USB Interrupt Enable
Frame Number
Frame List Base Address
Start Of Frame Modify
Port 1 Status/Control
Port 2 Status/Control
Register Description
Register
R/W
R/WC
R/W
R/W**
R/W
R/W
R/WC**
R/WC**
Register
Access
R/W
—
R/WC
—
R/W
R/W
—
R/WC
—
R/W
Register
Access