FW82801BA S L4HM Intel, FW82801BA S L4HM Datasheet - Page 156

• Manufacturer Part Number: FW82801BA S L4HM
• Manufacturer: Intel

Specifications of FW82801BA S L4HM

• Lead Free Status / RoHS Status: Not Compliant

Functional Description
5.13.8.4
5.13.8.5
5.13.9
5.13.9.1
156
Table 67. Transitions Due to Power Button
Note: During the time that the SLP_S4# signal is stretched for the minimum assertion width (if enabled),
PWRBTN# (Power Button)
Processor Initiated Passive Cooling
(Via Programmed Duty Cycle on STPCLK#)
Using the THTL_EN and THTL_DTY bits, the ICH5 can force a programmed duty cycle on the
STPCLK# signal. This reduces the effective instruction rate of the processor and cuts its power
consumption and heat generation.
Active Cooling
Active cooling involves fans. The GPIO signals from the ICH5 can be used to turn on/off a fan.
Event Input Signals and Their Usage
The ICH5 has various input signals that trigger specific events. This section describes those signals
and how they should be used.
The ICH5 PWRBTN# signal operates as a “Fixed Power Button” as described in the Advanced
Configuration and Power Interface, Version 2.0b. PWRBTN# signal has a 16 ms de-bounce on the
input. The state transition descriptions are included in
soon as the PWRBTN# is pressed (but after the debounce logic), and does not depend on when the
Power Button is released.
the Power Button is not a wake event. Refer to Power Button Override Function section below for
further detail.
Present
S1–S5
S0–S4
S0/Cx
State
G3
PWRBTN# held low for
at least 4 consecutive
PWRBTN# goes low
PWRBTN# goes low
PWRBTN# pressed
seconds
Event
Wake Event. Transitions to
Unconditional transition to S5
(depending on SCI_EN)
SMI# or SCI generated
Transition/Action
S0 state.
Intel
None
state.
®
82801EB ICH5 / 82801ER ICH5R Datasheet
Table
67. Note that the transitions start as
Software typically initiates a
Sleep state.
Standard wakeup
No effect since no power.
Not latched nor detected.
No dependence on processor
(e.g., Stop-Grant cycles) or any
other subsystem.
Comment