Intel® Server Board SE7520JR2

Platform Management

The following figure shows the power supply control signals and their sources. To turn on the system, the mBMC asserts the Power On signal and waits for the Power Good signal to assert in response, indicating that DC power is on.

Figure 23. Power Supply Control Signals

The mBMC uses the Power Good signal to monitor whether the power supply is on and operational, and to confirm whether the actual system power state matches the intended system on/off power state that was commanded with the Power On signal.

De-assertion of the Power Good signal generates an interrupt. The mBMC uses this to detect either power subsystem failure or loss of AC power. If AC power is suddenly lost, the mBMC:

1.Immediately asserts a system reset.

2.Powers down the system.

3.Waits for configured system off time, then attempts to power the system back up, depending on system power restore policy.

Revision 1.0

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C78844-002