VT8235 datasheet(84/145 Pages) VIA

84 / 145 page

VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-78-

Device 17 Function 0 Power Management Registers

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Offset 98 – GP2 / GP3 Timer Control .............................RW

GP3 Timer Start

On setting this bit to 1, the GP3 timer loads the value

defined by Rx5A and starts counting down. The GP3

timer is reloaded at the occurrence of certain events

enabled in the GP Timer Reload Enable Register

(Power Management I/O Space Offset 38h). If no

such event occurs and the GP3 timer counts down to

zero, then the GP3 Timer Timeout Status bit is set to

one (bit-13 of the Global Status register at Power

Management

I/O

Space

Offset

28h).

Additionally, if the GP3 Timer Timeout Enable bit is

set (bit-13 of the Global Enable register at Power

Management Register I/O Space Offset 2Ah), then an

SMI is generated.

GP3 Timer Automatic Reload

GP3 Timer stops at 0 ............................ default

Reload GP3 timer automatically after counting

down to 0

5-4

GP3 Timer Tick Select

00 Disable .................................................. default

01 1/16 second

10 1 second

11 1 minute

GP2 Timer Start

On setting this bit to 1, the GP2 timer loads the value

defined by Rx59 and starts counting down. The GP2

timer is reloaded at the occurrence of certain events

enabled in the GP Timer Reload Enable Register

(Power Management I/O Space Offset 38h). If no

such event occurs and the GP2 timer counts down to

zero, then the GP2 Timer Timeout Status bit is set to

one (bit-12 of the Global Status register at Power

Management

I/O

Space

Offset

28h).

Additionally, if the GP2 Timer Timeout Enable bit is

set (bit-12 of the Global Enable register at Power

Management Register I/O Space Offset 2Ah), then an

SMI is generated.

GP2 Timer Automatic Reload

GP2 Timer stops at 0 ............................ default

Reload GP2 timer automatically after counting

down to 0

1-0

GP2 Timer Tick Select

00 Disable .................................................. default

01 1/16 second

10 1 second

11 1 minute

Offset 99 – GP2 Timer...................................................... RW

Write: GP2 Timer Load Value

...............default = 0

Read: GP2 Timer Current Count

Offset 9A – GP3 Timer..................................................... RW

Write: GP3 Timer Load Value

...............default = 0

Read: GP3 Timer Current Count

Offset C3-C0 – Power Management Capability.............. RO

31-16 Power Management Capability

.always reads 0002h

15-8 Next Pointer

....................................always reads 00h

7-0

Capability ID

..................................always reads 01h

Offset C7-C4 – Power Mgmt Capability CSR................ RW

31-24 Power Management Data

...............always reads 00h

23-16 PM CSR P2P Support Extensions

.always reads 00h

15-0 PM Control / Status (D0/D3 Only)

..default = 0000h

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