Specifications

BMC Functional Specifications QSSC-S4R Technical Product Specification
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x The watchdog timer is stopped.
x The power, reset, front panel NMI, and ID buttons are unprotected.
x Fan speed control is determined by available SDRs. Fans may be set to a fixed state,
or basic fan management can be applied.
The BMC detects that the system has exited the ACPI S1 sleep state when it is notified by
the BIOS SMI handler.
S2 No Not supported
S3 No Not supported
S4 No Not supported
S5 Yes Soft off.
x The front panel buttons are not locked.
x The fans are stopped.
x The power up process goes through the normal boot process.
x The power, reset, front panel NMI, and ID buttons are unlocked.
23.2.1 ACPI Power Control
The chipset implements ACPI-compatible power control. Power control requests are routed to the BMC SLPS3n and
SLPS5n pins.
23.2.2 ACPI State Synchronization
The BIOS keeps the BMC synchronized with the system ACPI state. The BIOS provides the ACPI state when the
server transitions between the power and the sleep states. It uses the SMM interface to provide the ACPI state.
23.3 System Reset Control
23.3.1 Reset Signal Output
The BMC simulates a press of the front panel reset button to perform a system reset. The ICH performs the rest of the
system reset process. The BMC cannot hold the system in reset, and once started, the process is asynchronous with
respect to BMC operation.
The reset portion of the power-on process is performed by the ICH.
23.3.2 Reset Control Sources
The BMC runs a sensor initialization agent service whenever a reset is detected. The initialization agent will restart
when the BMC firmware resets. For more information on the initialization agent, see Section 24.7.2.
Reset Source System Reset BMC Firmware Reset
System powers-up Yes No
Reset button or in-target probe (ITP) reset Yes No
Soft reset / warm boot (DOS <Ctrl> + <Alt> + <Del>) Yes No
Hard reset Yes No
Command to reset the system Yes No
Watchdog timer configured for reset Yes No
AC Power applied Yes Yes
BMC Exits firmware transfer mode No Yes
SMI Timeout Yes No