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