307013-003 Datasheet, PDF (435/848 Pages) Intel Corporation – Intel I/O Controller Hub 7

LPC Interface Bridge Registers (D31:F0)
10.8.3.2
PM1_EN—Power Management 1 Enable Register
I/O Address:
Default Value:
Lockable:
Power Well:
PMBASE + 02h
(ACPI PM1a_EVT_BLK + 2) Attribute:
0000h
Size:
No
Usage:
Bits 0–7: Core,
Bits 8–9, 11–15: Resume,
Bit 10: RTC
R/W
16-bit
ACPI or Legacy
Bit
Description
15
Reserved
14
(Desktop
and
Mobile
Only)
PCI Express Wake Disable(PCIEXPWAK_DIS) — R/W. Modification of this bit
has no impact on the value of the PCIEXP_WAKE_STS bit.
0 = Inputs to the PCIEXP_WAKE_STS bit in the PM1 Status register enabled to wake
the system.
1 = Inputs to the PCIEXP_WAKE_STS bit in the PM1 Status register disabled from
waking the system.
14
(Ultra
Mobile
Only)
Reserved
13:11 Reserved
RTC Event Enable (RTC_EN) — R/W. This bit is in the RTC well to allow an RTC
event to wake after a power failure. This bit is not cleared by any reset other than
RTCRST# or a Power Button Override event.
10
0 = No SCI (or SMI#) or wake event is generated then RTC_STS (PMBASE + 00h, bit
10) goes active.
1 = An SCI (or SMI#) or wake event will occur when this bit is set and the RTC_STS
bit goes active.
9
Reserved.
Power Button Enable (PWRBTN_EN) — R/W. This bit is used to enable the
setting of the PWRBTN_STS bit to generate a power management event (SMI#,
SCI). PWRBTN_EN has no effect on the PWRBTN_STS bit (PMBASE + 00h, bit 8)
8
being set by the assertion of the power button. The Power Button is always enabled
as a Wake event.
0 = Disable.
1 = Enable.
7:6
Reserved.
Global Enable (GBL_EN) — R/W. When both the GBL_EN and the GBL_STS bit
(PMBASE + 00h, bit 5) are set, an SCI is raised.
5
0 = Disable.
1 = Enable SCI on GBL_STS going active.
4:1
Reserved.
Timer Overflow Interrupt Enable (TMROF_EN) — R/W. Works in conjunction
with the SCI_EN bit (PMBASE + 04h, bit 0) as described below:
TMROF_EN
SCI_EN
Effect when TMROF_STS is set
0
0
X
1
0
No SMI# or SCI
SMI#
1
1
SCI
Intel ^® ICH7 Family Datasheet
435