Wake Alarm Device Expired Timer: DC (WADT_EXP_DC) – Offset 180c - 001 - ID:834576 | Intel® 800 Series Chipset Family Platform Controller Hub (PCH), Volume 2

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Wake Alarm Device Expired Timer: DC (WADT_EXP_DC) – Offset 180c

Bit Range	Default	Access	Field Name and Description
31:0	ffffffffh	RW/V	Wake Alarm Device Expired Timer Value for DC Mode (WADT_EXP_DC_VAL) This field contains the 32-bit wake alarm device [quote]Expired Timer[quote] value (granularity 1s) for DC power. The timer begins decrementing after switching from AC to DC power, in the case where the WADT_DC timer has already expired while the platform was on AC power. This timer only decrements while operating on DC power. So if the power source switches back to AC power, the timer will stop (but not reset). When DC power returns, the timer will again begin decrementing. Note: This timer will only begin decrementing under the conditions described above if this field has been configured for something other than its default value of FFFFFFFFh (i.e. FFFFFFFFh = disabled). Upon expiration of this timer: If on DC power, GPE0b_STS.WADT_STS will be set. This status bit being set will generate a host wake if GPE0b_EN.WADT_EN is 1. BOTH the AC and DC Expired Timers return to their defaults value of FFFFFFFFh.

Bit Range

Default

Access

Field Name and Description

31:0

ffffffffh

RW/V

Wake Alarm Device Expired Timer Value for DC Mode (WADT_EXP_DC_VAL)

This field contains the 32-bit wake alarm device [quote]Expired Timer[quote] value (granularity 1s) for DC power.

The timer begins decrementing after switching from AC to DC power, in the case where the WADT_DC timer has already expired while the platform was on AC power. This timer only decrements while operating on DC power. So if the power source switches back to AC power, the timer will stop (but not reset). When DC power returns, the timer will again begin decrementing.

Note: This timer will only begin decrementing under the conditions described above if this field has been configured for something other than its default value of FFFFFFFFh (i.e. FFFFFFFFh = disabled).

Upon expiration of this timer:

If on DC power, GPE0b_STS.WADT_STS will be set. This status bit being set will generate a host wake if GPE0b_EN.WADT_EN is 1.

BOTH the AC and DC Expired Timers return to their defaults value of FFFFFFFFh.

Power and Reset Status (PRSTS)

Wake Alarm Device Expired Timer: AC (WADT_EXP_AC) Power and Reset Status (PRSTS)