Power Safe - Intel S7000FC4UR Technical Product Specification

Intel® Server System S7000FC4UR TPS
feature. The BMC monitors the power good signal of each power unit component via the Server
Management Diagnostics bus. The BMC generates a SEL event and system beep codes, as
shown in Table 101, if the VR/D2D fails due to power good de-assertion. The BMC also
provides the failure indications to the front panel system status LED to indicate a critical fault.
22.19.5

Power Safe

The BMC provides the Power Safe feature support for the server system. The Power Safe
feature prevents the server from shutting down, when one of the power supplies fails or is
removed unexpectedly while the power utilization level exceeds the power capacity of a single
power supply. The power utilization is monitored by the PLD, which provides the power
utilization indication to the BMC via the PS_NON_REDUNANCY signal. The
PS_NON_REDUNDANCY signal is asserted when the power supply utilization has reached or
exceeded a safe point and CPU throttling may be required. The Power Safe feature is ONLY
enabled if the input voltage range is less than 200 VAC. The Power Safe consists of three
operational states, Redundant, Non-Redundant, and Throttled.
Redundant State: The power sub-system remains in this state when ALL of the following
conditions applied.
Two operational power supplies presence in the system.
The PS_NON_REDUNDANCY signal is deasserted. This condition only applicable when
the input voltage is less than 200VAC.
Non-Redundant State: The BMC will log a non-redundant SEL event for the Power Unit
Redundancy sensor. The power sub-system will enter this state if ONE of the following
conditions occurs.
Only one power supply is operational.
The PS_NON_REDUNDANCY signal is asserted. The BMC will turn on the
PS_UTIL_LED on the main board for light guided diagnostic purposes. Note: This
condition is ONLY applicable when the input voltage range is less than 200VAC.
Throttled State: The BMC will throttle all the CPUs to reduce the power utilization in the system,
since the power utilization has exceeded the power capacity of a single power supply. The BMC
will log a CPU throttling SEL event. The power sub-system will enter this state if ALL of the
following conditions applied:
The input voltage range is less than 200 VAC.
Only one power supply is operational.
The PS_NON_REDUNDANCY signal is asserted.
Note: The BMC gets the AC input range from the PSMI device, which is embedded in the power
supply. Therefore, the BMC will disable the Power Safe feature if it detects problems with
communicating to the PSMI device.
Revision 1.0
BMC Functional Specifications
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