
VT8231
Preliminary Revision 0.8
October 29, 1999
-36-
Register Overview
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I/O Space Power Management- Registers
Offset Basic Control / Status Registers
1-0
Power Management Status
3-2
Power Management Enable
5-4
Power Management Control
6-7
-reserved-
B-8
Power Management Timer
C-F
-reserved-
Default
0000
0000
0000
00
0000 0000 RW
00
Acc
WC
RW
RW
—
—
Offset Processor Registers
13-10 Processor and PCI Bus Control
14
Processor LVL2
15
Processor LVL3
16-1F -reserved-
Default
0000 0000 RW
00
00
00
Acc
RO
RO
—
Offset General Purpose Registers
21-20 General Purpose Status
23-22 General Purpose SCI Enable
25-24 General Purpose SMI Enable
26-27 -reserved-
Default
0000
0000
0000
00
Acc
WC
RW
RW
—
Offset Generic Registers
29-28 Global Status
2B-2A Global Enable
2D-2C Global Control
2E
-reserved-
2F
SMI Command
33-30 Primary Activity Detect Status
37-34 Primary Activity Detect Enable
3B-38 GP Timer Reload Enable
3C-3F -reserved-
Default
0000
0000
0010
00
00
0000 0000
WC
0000 0000 RW
0000 0000 RW
00
Acc
WC
RW
RW
—
RW
—
Offset General Purpose I/O Registers
40
Extended I/O Trap Status
41
-reserved-
42
Extended I/O Trap Enable
43
-reserved-
44
External SMI / GPI Input Value
45
SMI / IRQ / Resume Status
46-47 -reserved-
4B-48 GPI Port Input Value
4F-4C GPO Port Output Value
50-FF -reserved-
Default
00
00
00
00
input
00
00
input
03FF FFFF
RW
00
Acc
WC
—
RW
—
RO
RO
—
RO
—
I/O Space System Management Bus Registers
Offset System Management Bus
0
SMBus Host Status
1
SMBus Slave Status
2
SMBus Host Control
3
SMBus Host Command
4
SMBus Host Address
5
SMBus Host Data 0
6
SMBus Host Data 1
7
SMBus Block Data
8
SMBus Slave Control
9
SMBus Shadow Command
A-B SMBus Slave Event
C-D SMBus Slave Data
E-F
-reserved-
Default
00
00
00
00
00
00
00
00
00
00
0000
0000
00
Acc
WC
RW
RW
RW
RW
RW
RW
RW
RW
RO
RW
RO
—