Intel SE7505VB2 Product Specification - Page 48

SE7505VB2 ACPI Implementation, ACPI, Front Panel Switches

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SE7505VB2 ACPI Implementation Intel® Server Board SE7505VB2 7. SE7505VB2 ACPI Implementation 7.1 ACPI An ACPI-aware operating system generates an SMI to request that the system be switched into ACPI mode. The BIOS responds to enable ACPI mode. The system automatically returns to legacy mode upon hard reset or power-on reset. The SE7505VB2 platform supports S0, S1, S4, and S5 states. When the system is operating in ACPI mode, the OS retains control of the system and OS policy determines the entry methods and wake up sources for each sleep state Note: Sleep entry and wake up event capabilities are provided by the hardware but are enabled by the operating system. S0 Sleep State The S0 sleep state is when everything is on. This is the state that no sleep is enabled. S1 Sleep State The S1 sleep state is a low wake-up latency sleep state. In this state, no system context is lost (Processor or chipset). The system context is maintained by the hardware. S4 Sleep State The S4 Non-Volatile Sleep state (NVS) is a special global system state that allows system context to be saved and restored (relatively slowly) when power is lost to the baseboard. If the system has been commanded to enter the S4 sleep state, the operating system will write the system context to a non-volatile storage file and leave appropriate context markers. S5 Sleep State The S5 sleep state is similar to the S4 sleep state except the operating system does not save any context nor enable any devices to wake the system. The system is in the "soft" off state and requires a complete boot when awakened. 7.1.1 Front Panel Switches The baseboard supports two front panel buttons: Power button Reset button 48 Revision 1.2 Intel part number C32194-002

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SE7505VB2 ACPI Implementation
Intel® Server Board SE7505VB2
7.
SE7505VB2 ACPI Implementation
7.1
ACPI
An ACPI-aware operating system generates an SMI to request that the system be switched into
ACPI mode. The BIOS responds to enable ACPI mode. The system automatically returns to
legacy mode upon hard reset or power-on reset.
The SE7505VB2 platform supports S0, S1, S4, and S5 states. When the system is operating in
ACPI mode, the OS retains control of the system and OS policy determines the entry methods
and wake up sources for each sleep state
Note:
Sleep entry and wake up event capabilities are provided by the hardware but are enabled
by the operating system.
S0 Sleep State
The S0 sleep state is when everything is on. This is the state that no sleep is
enabled.
S1 Sleep State
The S1 sleep state is a low wake-up latency sleep state. In this state, no
system context is lost (Processor or chipset). The system context is
maintained by the hardware.
S4 Sleep State
The S4 Non-Volatile Sleep state (NVS) is a special global system state that
allows system context to be saved and restored (relatively slowly) when
power is lost to the baseboard. If the system has been commanded to enter
the S4 sleep state, the operating system will write the system context to a
non-volatile storage file and leave appropriate context markers.
S5 Sleep State
The S5 sleep state is similar to the S4 sleep state except the operating
system does not save any context nor enable any devices to wake the
system. The system is in the “soft” off state and requires a complete boot
when awakened.
7.1.1
Front Panel Switches
The baseboard supports two front panel buttons:
±
Power button
±
Reset button
Revision 1.2
Intel part number C32194-002
48