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Format of PCI Configuration Data for Intel 82371AB (PIIX4), ISA Bridge

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Offset Size Description

00h

64 BYTEs

header (see #00878) (vendor ID 8086h, device ID 7110h)

40h

12 BYTEs

reserved

4Ch

BYTE

ISA I/O recovery timer (see #01101)

4Dh

BYTE

reserved

4Eh

WORD

X-Bus Chip Select (see #01089,#01102)

50h

16 BYTEs

reserved

60h

BYTE

PIRQA route control (see #01076)

61h

BYTE

PIRQB route control (see #01076)

62h

BYTE

PIRQC route control (see #01076)

63h

BYTE

PIRQD route control (see #01076)

64h

BYTE

serial IRQ control

65h

4 BYTEs

reserved???

69h

BYTE

top of memory

6Ah

WORD

miscellaneous status

6Ch

10 BYTEs

reserved???

76h

BYTE

motherboard device DMA control 0

77h

BYTE

motherboard device DMA control 1

78h

9 BYTEs

reserved???

80h

BYTE

APIC base address relocation

81h

BYTE

reserved???

82h

BYTE

deterministic latency control

83h

13 BYTEs

reserved???

90h

WORD

PCI DMA configuration

92h

WORD

distributed DMA (channels 0-3) slave base pointer

94h

WORD

distributed DMA (channels 5-7) slave base pointer

96h

26 BYTEs

reserved???

B0h

DWORD

general configuration

B4h

23 BYTEs

reserved???

CBh

BYTE

real-time clock configuration

CCh

52 BYTEs

reserved

See Also:

#00873,#01103,#01104,#01105