Datasheet

Chipset Configuration Registers
210 Intel® Xeon® Processor D-1500 Product Family
Datasheet - Volume 1 of 4: Integrated Platform Controller Hub
March 2015
5.1.37 WADT_EXP_AC—Wake Alarm Device Expired Timer – AC
Register
Offset Address: 3308–330Bh Attribute: R/W
Default Value: FFFFFFFFh Size: 32-bit
5.1.38 WADT_EXP_DC—Wake Alarm Device Expired Timer: DC
Register
Offset Address: 330C–330Fh Attribute: R/W
Default Value: FFFFFFFFh Size: 32-bit
5.1.39 PRSTS—Power and Reset Status Register
Offset Address: 3310–3313h Attribute: RO, R/WC
Default Value: 05000000h Size: 32-bit
Bit Description
31:0 Wake Alarm Device Expired Timer Value for AC Mode (WADT_EXP_AC_VAL): R/W. This
field contains the 32-bit wake alarm device “Expired Timer” value (1 second granularity) 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 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.
Upon expiration of this timer:
• If on AC power, GPE0_STS.WADT_STS will be set. This status bit being set will generate a
host wake if GPE0_EN.WADT_EN is ‘1’.
• Both the AC and DC Expired TImers return to their default value of FFFFFFFFh.
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.
Note: Bits in this register only need to be valid for reading when the Main power well is up.
Bit Description
31:0 Wake Alarm Device Expired Timer Value for DC Mode (WADT_EXP_DC_VAL): R/W. This
field contains the 32-bit wake alarm device “Expired Timer” value (1 second granularity) 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 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.
Upon expiration of this timer:
• If on DC power, GPE0_STS.WADT_STS will be set. This status bit being set will generate a
host wake if GPE0_EN.WADT_EN is ‘1’.
• Both the AC and DC Expired TImers return to their default value of FFFFFFFFh.
•
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 FFFFFFFF.
Note: Bits in this register only need to be valid for reading when the Main power well is up.
Bit Description
31:16 Reserved
15 Power Management Watchdog Timer — R/WC. This bit is set when the Power Management
watchdog timer causes a global reset. This bit is cleared when the software writes it with a 1b.
14:7 Reserved
6 Intel
®
Management Engine Watchdog Timer Status — R/WC. This bit is set when the Intel
Management Engine watchdog timer causes a global reset. This bit is cleared when the software
writes it with a 1b.