VT8235 datasheet(82/145 Pages) VIA

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VT8235 V-Link South Bridge

Revision 1.22 October 24, 2002

-76-

Device 17 Function 0 Power Management Registers

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Offset 93-90 - GP Timer Control (0000 0000h)...............RW

31-30 Conserve Mode Timer Count Value

00 1/16 second............................................ default

01 1/8 second

10 1 second

11 1 minute

Conserve Mode Status

This bit reads 1 when in Conserve Mode

Conserve Mode

This bit controls whether conserve mode (throttling)

is enabled. When this bit is set, the system can enter

conserve mode when primary activity is not detected

within a given time period (determined by bits 31-30

of this register). Primary activity is defined in PMIO

Rx33-30.

Disable .................................................. default

Enable

27-26 Secondary Event Timer Count Value

00 2 milliseconds........................................ default

01 64 milliseconds

10 ½ second

11 by EOI + 0.25 milliseconds

Secondary Event Occurred Status

This bit reads 1 to indicate that a secondary event has

occurred (to resume the system from suspend) and

the secondary event timer is counting down.

Secondary Event Timer Enable

Disable .................................................. default

Enable

23-16 GP1 Timer Count Value

(base defined by bits 5-4)

Write to load count value; Read to get current count

15-8 GP0 Timer Count Value

(base defined by bits 1-0)

Write to load count value; Read to get current count

GP1 Timer Start

On setting this bit to 1, the GP1 timer loads the value

defined by bits 23-16 of this register and starts

counting down.

The GP1 timer is reloaded at the

occurrence of certain peripheral events enabled in the

Timer

Reload

Enable

(Power

Management I/O Space Offset 38h). If no such event

occurs and the GP1 timer counts down to zero, then

the GP1 Timer Timeout Status bit is set to one (bit-3

of the Global Status register at Power Management

GP1 Timer Timeout Enable bit is set (bit-3 of the

Global

Enable

Power

Management

generated.

GP1 Timer Automatic Reload

GP1 Timer stops at 0 ............................ default

Reload GP1 timer automatically after counting

down to 0

5-4

GP1 Timer Base

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

01 1/16 second

10 1 second

11 1 minute

GP0 Timer Start

On setting this bit to 1, the GP0 timer loads the value

defined by bits 15-8 of this register and starts

counting down.

The GP0 timer is reloaded at the

occurrence of certain peripheral events enabled in the

Timer

Reload

Enable

(Power

Management I/O Space Offset 38h). If no such event

occurs and the GP0 timer counts down to zero, then

the GP0 Timer Timeout Status bit is set to one (bit-2

of the Global Status register at Power Management

GP0 Timer Timeout Enable bit is set (bit-2 of the

Global

Enable

Power

Management

generated.

GP0 Timer Automatic Reload

GP0 Timer stops at 0 ............................ default

Reload GP0 timer automatically after counting

down to 0

1-0

GP0 Timer Base

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

01 1/16 second

10 1 second

11 1 minute

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