NH82801DB S L8DE Intel, NH82801DB S L8DE Datasheet - Page 143
NH82801DB S L8DE
Manufacturer Part Number
NH82801DB S L8DE
Description
Manufacturer
Intel
Datasheet
1.NH82801DB_S_L8DE.pdf
(587 pages)
Specifications of NH82801DB S L8DE
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Table 5-41. Causes of Wake Events
Table 5-42. GPI Wake Events
82801DB ICH4 Datasheet
NOTES:
It is important to understand that the various GPIs have different levels of functionality when used
as wake events. The GPIs that reside in the core power well can only generate wake events from an
S1 state. Also only certain GPIs are “ACPI Compliant,” meaning that their Status and Enable bits
reside in ACPI I/O space.
The latency to exit the various Sleep states varies greatly and is heavily dependent on power supply
design, so much so that the exit latencies due to the ICH4 are insignificant.
1. This will be a wake event from S5 only if the sleep state was entered by setting the SLP_EN and SLP_TYP
2. If in the S5 state due to a powerbutton override, the possible wake events are due to Power Button, Hard
3. The entry for USB changes from being able to wake from S1
RTC Alarm
Power Button
GPI[0:n]
USB
LAN
RI#
AC ’97
Primary PME#
Secondary PME#
SMBALERT#
SMBus Slave
Message
SMBus Host Notify
message received
PME_B0 (internal USB
EHCI controller)
bits via software.
Reset Without Cycling (See Command Type 3 in
Type 4 in
designs actively blocked wake events while in S5. There is no need to do this as software already disables
waking from USB on S5 (so the wake bits are masked), and in the future power buttons will move to USB
keyboards, and a wake from S5 will be necessary.
GPI[13:11], GPI[8]
GPI[7:0]
Cause
GPI
Table
5-95).
States Can Wake
Table 5-42
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1–S5
S1
S1
From
Power Well
–
–
–
–
–
–
–
–
–
–
–
–
S5
S5
S5
S5
S5
S5
Resume
S5
S5
S5
S5
S5
S5
Core
(1)
(1)
(3)
(1)
(1)
(1)
summarizes the use of GPIs as wake events.
Set RTC_EN bit in PM1_EN register
Always enabled as Wake event
GPE0_EN register
Set USB1_EN, USB 2_EN and USB3_EN bits in GPE0_EN
register
Will use PME#. Wake enable set with LAN logic.
Set RI_EN bit in GPE0_EN register
Set AC ’97_EN bit in GPE0_EN register
PME_B0_EN bit in GPE0_EN register
Set PME_EN bit in GPE0_EN Register.
Always enabled as Wake event
Wake/SMI# command always enabled as a Wake Event.
NOTE: SMBus Slave Message can wake the system from S1–
HOST_NOTIFY_WKEN bit SMBus Slave Command register.
Reported in the SMB_WAK_STS bit in the GPEO_STS register.
Set PME_B0_EN bit in GPE0_EN register.
Table
S5, as well as from S5 due to Power Button Override.
5-95), and Hard Reset System (See Command
Wake From
S1–S5
–
S4 to being able to wake from S1
S1
How Enabled
Functional Description
ACPI Compliant
Notes
–
S5. Previous
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