Intel SE7525GP2 Product Specification - Page 127
System Reset Control, Temperature-based Fan Speed Control
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Intel® Server Boards SE7320SP2 and SE7525GP2 Platform Management 5.3.2 System Reset Control 5.3.2.1 Reset Signal Output The mBMC asserts the System Reset signal on the server board to perform a system reset. The mBMC asserts the System Reset signal before powering the system up. After power is stable (as indicated by the power subsystem Power Good signal), the mBMC sets the processor enable state as appropriate and de-asserts the System Reset signal, taking the system out of reset. To reset the system without a power state change, the mBMC: Asserts the System Reset signal. Holds this state for as long as the reset button is pushed. When a command is used to generate a system reset, the state is held for the stipulated time. De-asserts the System Reset signal. 5.3.2.2 Reset Control Sources The following table shows the reset sources and the actions taken by the system. Table 54. System Reset Sources and Actions # Reset Source 1 Standby power comes up System Reset? mBMC Reset No (no DC power) Yes 2 Main system power comes up Yes No 3 Reset button or in-target probe (ITP) reset Yes No 4 Warm boot (example: DOS Ctrl-Alt-Del) Yes No 5 Command to reset the system Yes No 6 Set Processor State command Yes No 7 Watchdog timer configured for reset Yes No 8 FRB3 failure Yes No 9 PEF action Optional No 5.3.3 Temperature-based Fan Speed Control Server board hardware implements an ambient-temperature-based Fan Speed control that is part of normal system operation. With one exception, the management controller does not participate in fan speed control. The feature allows the server board to drive different fan speeds based on various temperature measurements in order to lower the acoustic noise of the system. The ambient-temperature thresholds at which the fan speed increases does not correspond to a non-critical (warning) condition for the fan because the fan's state is still 'OK' from the system point-of-view. Revision 4.0 115