82801DB Datasheet, PDF (362/587 Pages) Intel Corporation – Intel 82801DB I/O Controller Hub 4 (ICH4)

LPC Interface Bridge Registers (D31:F0)
9.8.3.8
GPE0_EN—General Purpose Event 0 Enables Register
I/O Address:
Default Value:
Lockable:
Power Well:
PMBASE + 2Ch
(ACPI GPE0_BLK + 2)
00000000h
No
Bits 0–7, 12, 16–31 Resume,
Bits 8–11, 13–15 RTC
Attribute:
Size:
Usage:
R/W
32-bit
ACPI
Note: This register is symmetrical to the General Purpose Event 0 Status Register. All the bits in this
register should be cleared to 0 based on a Power Button Override. The resume well bits are all
cleared by RSMRST#. The RTC sell bits are cleared by RTCRST#.
Bit
31:16
15:14
13
12
11
10
9
8
7
6
5
4
Description
GPIn_EN — R/W. These bits enable the corresponding GPI[n]_STS bits being set to cause a
SCI, and/or wake event. These bits are cleared by RSMRST#.
Reserved
PME_B0_EN — R/W. Enables the setting of the PME_B0_STS bit to generate a wake event and/
or an SCI or SMI#. PME_B0_STS can be a wake event from the S1–S4 states, or from S5 (if
entered via SLP_TYP and SLP_EN) or power failure, but not Power Button Override. This bit
defaults to 0. It is only cleared by Software or RTCRST#. It is not cleared by CF9h writes.
USB3_EN — R/W.
0 = Disable.
1 = Enable the setting of the USB3_STS bit to generate a wake event. The USB3_STS bit is set
anytime USB UHCI controller #3 signals a wake event. Break events are handled via the
USB interrupt.
PME_EN — R/W.
0 = Disable.
1 = Enables the setting of the PME_STS to generate a wake event and/or an SCI. PME# can be
a wake event from the S1–S4 state or from S5 (if entered via SLP_EN, but not power button
override).
Reserved
Reserved
RI_EN — R/W. The value of this bit will be maintained through a G3 state and is not affected by a
hard reset caused by a CF9h write.
0 = Disable.
1 = Enables the setting of the RI_STS to generate a wake event.
Reserved
TCOSCI_EN — R/W.
0 = Disable.
1 = Enables the setting of the TCOSCI_STS to generate an SCI.
AC97_EN — R/W.
0 = Disable.
1 = Enables the setting of the AC97_STS to generate a wake event.
USB2_EN — R/W.
0 = Disable.
1 = Enable the setting of the USB2_STS bit to generate a wake event. The USB2_STS bit is set
anytime USB UHCI controller #2 signals a wake event. Break events are handled via the
USB interrupt.
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Intel^® 82801DB ICH4 Datasheet