Intel SE7525GP2 Product Specification - Page 126
Power-up Sequence, 3.1.2, Power-down Sequence, 3.1.3, Power Control Sources
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Platform Management Intel® Server Boards SE7320SP2 and SE7525GP2 5.3.1.1 Power-up Sequence When turning on the system power in response to one of the event occurrences listed in Table 53 below, the mBMC executes the following procedure: The mBMC asserts Power On and waits for the power subsystem to assert Power Good. The system is held in reset. The mBMC sends a Set ACPI Power State command, indicating an S0 state to all management controllers whose SDR management device records indicate that they should receive the notification. The mBMC initializes all sensors to their Power On initialization state. The Init Agent is run. The mBMC attempts to boot the system by running the FRB algorithm. 5.3.1.2 Power-down Sequence To power down the system, the mBMC effectively performs the sequence of power-up steps in reverse order. This operation can be initiated by one of the event occurrences listed in Table 53 and proceeds as follows: The mBMC asserts system reset (de-asserts Power Good). If enabled, the mBMC sends a Set ACPI Power State command, indicating an S0 state to all management controllers whose SDR management device records indicate that they should receive the notification. The mBMC de-asserts the Power On signal. The power subsystem turns off system power upon de-assertion of the Power On signal. 5.3.1.3 Power Control Sources The sources listed in the following table can initiate power-up and/or power-down activity. Table 53. Power Control Initiators # Source 1 Power Button External Signal Name or Internal Subsystem FP Power button Capabilities Turns power on or off 2 mBMC Watchdog Timer Internal mBMC timer Turns power off, or power cycle 3 Platform Event Filtering PEF Turns power off, or power cycle 4 Command Routed through command processor Turns power on or off, or power cycle 5 Power state retention Implemented via mBMC internal logic Turns power on when AC power returns 6 Chipset Sleep S5 Turns power on or off 114 Revision 4.0