Wake Alarm Device Expired Timer: AC (WADT_EXP_AC) – Offset 1808
Bits in this register only need to be valid for reading when the Main power well is up. However, since some of the events may initially be detected while the Main power well and SUS well are down, they are marked as DSW bits.
Bit Range | Default | Access | Field Name and Description |
31:0 | ffffffffh | RW/V | Wake Alarm Device Expired Timer Value for AC Mode (WADT_EXP_AC_VAL) This field contains the 32-bit wake alarm device [quote]Expired Timer[quote] value (granularity 1s) for AC power.
The timer begins decrementing after switching from DC to AC power, in the case where the WADT_AC timer has already expired while the platform was on DC power. This timer only decrements while operating on AC power. So if the power source switches back to DC power, the timer will stop (but not reset). When AC 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 AC 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. |