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SE7221BK1-E Technical Product Specification
Revision 1.3
24
supply through an inverter, and then transition to an ON state.
Power Button On to Off
(Legacy):
The ICH6 is configured to generate an SMI due to a power button
event. The BIOS services this SMI and sets the state of the
machine in the ICH6 and Super IO to the OFF state.
Power Button On to Off
(ACPI):
If an ACPI operating system is loaded, the power button switch
generates a request (via SCI) to the OS to shutdown the system.
The OS retains control of the system and determines what sleep
state (if any) the system transitions to.
Reset Button:
The reset button will generate a hard reset to the system.
NMI Button:
The NMI button will force an NMI to the processors.
6.1.2 Wake up Sources (ACPI and Legacy)
The baseboard is capable of wake up from several sources under a non-ACPI configuration,
such as when the operating system does not support ACPI. The wake up sources are defined in
the following table.
Table 15. Supported Wake Events
Wake Event Supported via ACPI
(by sleep state)
Supported Via Legacy Wake
Power Button Always wakes system Always wakes system
PME from PCI 32/33 S1, S4 S5
PME from primary PCI 64/66 S1, S4 S5
RTC Alarm S1, S4 No
Mouse S1 No
Keyboard S1 No
USB S1 No
Under ACPI, the operating system programs the ICH6R and Super IO to wake up on the
desired event, but in legacy mode, the BIOS enables/disables wake up sources based on an
option in BIOS Setup. The operating system or a driver must clear any pending wake up status
bits in the associated hardware (such as the Wake on LAN status bit in the LAN application
specific integrated circuit (ASIC), or PCI Power Management Event (PME) status bit in a PCI
device. The legacy wake up feature is disabled by default.