NH82801DB S L8DE Intel, NH82801DB S L8DE Datasheet - Page 354

• Manufacturer Part Number: NH82801DB S L8DE
• Manufacturer: Intel

Specifications of NH82801DB S L8DE

• Lead Free Status / RoHS Status: Compliant

LPC Interface Bridge Registers (D31:F0)
9.8.3.1
354
Note: Bit 5 does not cause an SMI# or a wake event. Bit 0 does not cause a wake event but can cause an
PM1_STS—Power Management 1 Status Register
I/O Address:
Default Value:
Lockable:
Power Well:
If bit 10 or 8 in this register is set, and the corresponding _EN bit is set in the PM1_EN register,
then the ICH4 will generate a Wake Event. Once back in an S0 state (or if already in an S0 state
when the event occurs), the ICH4 will also generate an SCI if the SCI_EN bit is set, or an SMI# if
the SCI_EN bit is not set.
SMI# or SCI.
14:12
Bit
15
11
10
9
Wake Status (WAK_STS) — R/WC. This bit is not affected by hard resets caused by a CF9 write,
but is reset by RSMRST#.
0 = Software clears this bit by writing a 1 to the bit position.
1 = Set by hardware when the system is in one of the sleep states (via the SLP_EN bit) and an
If the AFTERG3_EN bit is not set and a power failure occurs without the SLP_EN bit set, the
system will return to an S0 state when power returns and the WAK_STS bit will not be set.
If the AFTERG3_EN bit is set and a power failure occurs without the SLP_EN bit having been set,
the system will go into an S5 state when power returns, and a subsequent wake event will cause
the WAK_STS bit to be set. Note that any subsequent wake event would have to be caused by
either a Power Button press, or an enabled wake event that was preserved through the power
failure (enable bit in the RTC well).
Reserved
Power Button Override Status (PRBTNOR_STS) — R/WC. This bit is set any time a Power
Button Override occurs (i.e., the power button is pressed for at least 4 consecutive seconds), or
due to the corresponding bit in the SMBus slave message. The power button override causes an
unconditional transition to the S5 state, as well as sets the AFTERG# bit. The BIOS or SCI
handler clears this bit by writing a 1 to it. This bit is not affected by hard resets via CF9h writes,
and is not reset by RSMRST#. Thus, this bit is preserved through power failures.
RTC Status (RTC_STS) — R/WC. This bit is not affected by hard resets caused by a CF9 write,
but is reset by RSMRST#.
0 = Software clears this bit by writing a 1 to the bit position.
1 = Set by hardware when the RTC generates an alarm (assertion of the IRQ8# signal).
Reserved
enabled wake event occurs. Upon setting this bit, the Intel
the ON state.
Additionally if the RTC_EN bit is set, the setting of the RTC_STS bit will generate a wake
event.
PMBASE + 00h
0000h
No
Bits 0
Bits 8
Bit 11: RTC
(
ACPI PM1a_EVT_BLK)
–
–
7: Core,
10, 12
–
15: Resume,
Description
Attribute:
Size:
Usage:
Intel
®
ICH4 will transition the system to
R/WC
16 bit
ACPI or Legacy
®
82801DB ICH4 Datasheet