
9,$7HFKQRORJLHV,QF
VT82C586B
Revision 1.0
May 13, 1997
-
16-
Register Overview
PCI Function 0 Registers - PCI-to-ISA Bridge
Configuration Space PCI-to-ISA Bridge Header Registers
Offset PCI Configuration Space Header
1-0
Vendor ID
3-2
Device ID
5-4
Command
7-6
Status
8
Revision ID
9
Programming Interface
A
Sub Class Code
B
Base Class Code
C
-reserved- (cache line size)
D
-reserved- (latency timer)
E
Header Type
F
Built In Self Test (BIST)
10-27 -reserved- (base address registers)
28-2B -reserved- (unassigned)
2F-2C Subsystem ID Read
30-33 -reserved- (expan. ROM base addr)
34-3B -reserved- (unassigned)
3C
-reserved- (interrupt line)
3D
-reserved- (interrupt pin)
3E
-reserved- (min gnt)
3F
-reserved- (max lat)
Default
1106
0586
000F
0200
nn
00
01
06
00
00
80
00
00
00
00
00
00
00
00
00
00
Acc
RO
RO
RW
WC
RO
RO
RO
RO
—
—
RO
RO
—
—
RO
—
—
—
—
—
—
Configuration Space PCI-to-ISA Bridge-Specific Registers
Offset ISA Bus Control
40
ISA Bus Control
41
ISA Test Mode
42
ISA Clock Control
43
ROM Decode Control
44
Keyboard Controller Control
45
Type F DMA Control
46
Miscellaneous Control 1
47
Miscellaneous Control 2
48
Miscellaneous Control 3
49
-reserved-
4A
IDE Interrupt Routing
4B
-reserved-
4C
DMA / Master Mem Access Control 1
4D
DMA / Master Mem Access Control 2
4F-4E DMA / Master Mem Access Control 3
Default
00
00
00
00
00
00
00
00
01
00
04
00
00
00
0300
Acc
RW
RW
RW
RW
RW
RW
RW
RW
RW
—
RW
—
RW
RW
RW
Offset Plug and Play Control
50
-reserved- (do not program)
51-53 -reserved-
54
PCI IRQ Edge / Level Selection
55
PnP Routing for External MIRQ0-1
56
PnP Routing for PCI INTB-A
57
PnP Routing for PCI INTD-C
58
PnP Routing for External MIRQ2
59
MIRQ Pin Configuration
5A
XD Power-On Strap Options
5B
Internal RTC Test Mode
5C
DMA Control
5F-5D -reserved-
Power-up default value depends on external strapping
Default
24
00
00
00
00
00
00
04
00
00
00
Acc
RW
—
RW
RW
RW
RW
RW
RW
RW
RW
RW
—
Offset Distributed DMA
61-60 Channel 0 Base Address / Enable
63-62 Channel 1 Base Address / Enable
65-64 Channel 2 Base Address / Enable
67-66 Channel 3 Base Address / Enable
69-68 -reserved-
6B-6A Channel 5 Base Address / Enable
6D-6C Channel 6 Base Address / Enable
6F-6E Channel 7 Base Address / Enable
Default
0000
0000
0000
0000
0000
0000
0000
0000
Acc
RW
RW
RW
RW
—
RW
RW
RW
Offset Miscellaneous
70
Subsystem ID Write
71-7F -reserved-
Default
00
00
Acc
WO
—