Product specifications

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002 -30- Register Overview

I/O Space Power Management Registers

Offset

Basic Control / Status Re

g

isters Default Acc

1-0 Power Management Status 0000

WC

3-2 Power Management Enable 0000 RW

5-4 Power Management Control 0000 RW

6-7 -reserved- 00

—

B-8 Power Management Timer 0000 0000 RW

C-F -reserved- 00

—

Offset

Processor Re

g

isters Default Acc

13-10 Processor and PCI Bus Control 0000 0000 RW

14 Processor LVL2 00

RO

15 Processor LVL3 00

RO

16-1F -reserved- 00

—

Offset

General Pur

p

ose Re

g

isters Default Acc

21-20 General Purpose Status 0000

WC

23-22 General Purpose SCI Enable 0000 RW

25-24 General Purpose SMI Enable 0000 RW

26-27 -reserved- 00

—

Offset

Generic Re

g

isters Default Acc

29-28 Global Status 0000

WC

2B-2A Global Enable 0000 RW

2D-2C Global Control

0010

RW

2E -reserved- 00

—

2F SMI Command 00 RW

33-30 Primary Activity Detect Status 0000 0000

WC

37-34 Primary Activity Detect Enable 0000 0000 RW

3B-38 GP Timer Reload Enable 0000 0000 RW

3C-3F -reserved- 00

—

Offset

General Pur

p

ose I/O Re

g

isters Default Acc

40 Extended I/O Trap Status 00

WC

41 -reserved- 00

—

42 Extended I/O Trap Enable 00 RW

43-44 -reserved- 00

—

45 SMI / IRQ / Resume Status 00

RO

46-47 -reserved- 00

—

4B-48 GPI Port Input Value

input RO

4F-4C GPO Port Output Value

FFFFCFFF

RW

50 GPI Pin Change Status

00

RW

51 -reserved- 00

—

52 GPI Pin Change SCI/SMI Select 00 RW

53-57 -reserved- 00

—

59-58 I/O Trap PCI I/O Address 0000

RO

5A I/O Trap PCI Command / Byte Ena 00

RO

5B -reserved- 00

—

5C CPU Performance Control 00 RW

5D-FF -reserved- 00

—

I/O Space System Management Bus Registers

Offset

System Management Bus

Default Acc

0 SMBus Host Status 00

WC

1 SMBus Slave Status 00 RW

2 SMBus Host Control 00 RW

3 SMBus Host Command 00 RW

4 SMBus Host Address 00 RW

5 SMBus Host Data 0 00 RW

6 SMBus Host Data 1 00 RW

7 SMBus Block Data 00 RW

8 SMBus Slave Control 00 RW

9 SMBus Shadow Command 00

RO

A-B SMBus Slave Event 0000 RW

C-D SMBus Slave Data 0000

RO

E -reserved- 00

—

F SMBus GPIO Slave Address 00 RW

System Management Bus Command Codes

Code

System Management Bus

Default Acc

00 SMBus GPIO Slave Input Data

— RO

01 SMBus GPIO Slave Output Data 00 RW

02 SMBus GPIO Slave Polarity Inversion

F0

RW

03 SMBus GPIO Slave I/O Configuration

FF

RW