PIIX3 datasheet(29/122 Pages) INTEL

29 / 122 page

82371FB (PIIX) AND 82371SB (PIIX3)

Address

Address (bits)

Type

Name

Access

(hex)

FEDC

BA98

7654

3210

00CAh3

0000

1100

101x

r/w

DMA2 CH2 Base and Current

Count

PCI

00CCh3

0000

1100

110x

r/w

DMA2 CH3 Base and Current

Address

PCI

00CEh3

0000

1100

111x

r/w

DMA2 CH3 Base and Current

Count

PCI

00D0h3

0000

1101

000x

r/w

DMA2 Status(r) Command(w)

PCI

00D2h3

0000

1101

001x

DMA2 Write Request

PCI

00D4h3

0000

1101

010x

DMA2 Write Single Mask Bit

PCI

00D6h3

0000

1101

011x

DMA2 Write Mode

PCI

00D8h3

0000

1101

100x

DMA2 Clear Byte Pointer

PCI

00DAh3

0000

1101

101x

DMA2 Master Clear

PCI

00DCh3

0000

1101

110x

DMA2 Clear Mask

PCI

00DEh3

0000

1101

111x

r/w

DMA2 Read/Write All Mask

PCI

00F0h1

0000

1111

0000

Coprocessor Error

PCI/ISA

04D0h

0000

0100

1101

0000

r/w

INT-1 edge/level control

PCI/ISA

04D1h

0000

0100

1101

0001

r/w

INT-2 edge/level control

PCI/ISA

0CF9h

0000

1100

1111

1001

r/w

Reset Control

PCI

NOTES:

Read and write accesses to these locations are always broadcast to the ISA Bus.

Write accesses to these locations are broadcast to the ISA Bus. Read Accesses are not.

PIIX: If programmed in the ISA Controller Recovery Timer register, the PIIX will not alias the 90h-9Fh address range with

the following addresses: 80h, 84

−86h, 88h, and 8C−8Eh. In this case accesses to the 90h - 9Fh address range for the

previously specified addresses are forwarded to the ISA Bus for both reads and writes and are ignored during ISA Master

cycles (i.e., They are no-longer considered PIIX registers). Note, that port 92 is always a distinct ISA register and is always

forwarded to the ISA Bus.

PIIX3: If programmed in the ISA Controller Recovery Timer register, the PIIX3 does not alias the entire 90h-9Fh address

range. These locations are considered ISA Bus register locations and not PIIX3 registers.

ISA-Compatible DMA register I/O space accesses are always subtractively decoded.

PIIX3 Scheda tecnica(PDF) 29 Page - Intel Corporation

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