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82371AB Datasheet(PDF) 49 Page - Intel Corporation

Part # 82371AB
Description  PCI-TO-ISA / IDE XCELERATOR PIIX4
PDF  284 Pages
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Manufacturer  INTEL [Intel Corporation]
Direct Link  http://www.intel.com
Logo INTEL - Intel Corporation

82371AB Datasheet(HTML) 49 Page - Intel Corporation

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82371AB (PIIX4)
49
4/9/97 2:23 PM PIIX4aDS
INTEL CONFIDENTIAL
(until publication date)
PRELIMINARY
Table 8. PCI Configuration Registers—Function 2 (USB Interface)
Address Offset
Mnemonic
Register Name
Access
3Ch
INTLN
Interrupt Line
R/W
3Dh
INTPN
Interrupt Pin
RO
3E–5Fh
—
Reserved
—
60h
SBRNUM
Serial Bus Release Number
RO
61–BFh
—
Reserved
—
C0–C1h
LEGSUP
Legacy Support
R/W
C2–FFh
—
Reserved
RO
3.3.2.
IO SPACE REGISTERS
Table 9. USB Host/Controller I/O Registers
Offset From
Base Address
Mnemonic
Register Name
Access
00
−01h
USBCMD
USB Command
R/W
2
02
−03h
USBSTS
USB Status
R/WC
04
−05h
USBINTR
USB Interrupt Enable
R/W
06
−07h
FRNUM
Frame Number
R/W
2
08
−0Bh
FLBASEADD
Frame List Base Address
R/W
0Ch
SOFMOD
Start Of Frame Modify
R/W
10
−11h
PORTSC0
Port 0 Status and Control
R/WC
2
12
−13h
PORTSC1
Port 1 Status and Control
R/WC
2
NOTES:
1.
The base address is programmable via the USBBA Register (20
−23h; function 2)
2.
These registers are WORD writeable only. Byte writes to these registers have unpredictable effects.



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