Platform Management OverviewIntel® Server Board S2600IP and Intel® Workstation Board W2600CR TPS
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Revision 1.1
Intel order number G34153-003
4.8.1.4
SmaRT/CLST
The power supply optimization provided by SmaRT/CLST relies on a platform HW capability as
well as ME FW support. When a PMBus*-compliant power supply detects insufficient input
voltage, an overcurrent condition, or an over-temperature condition, it will assert the SMBAlert#
signal on the power supply SMBus* (that is, the PMBus*). Through the use of external gates,
this results in a momentary assertion of the PROCHOT# and MEMHOT# signals to the
processors, thereby throttling the processors and memory. The ME FW also sees the
SMBAlert# assertion, queries the power supplies to determine the condition causing the
assertion, and applies an algorithm to either release or prolong the throttling, based on the
situation.
System power control modes include:
1. SmaRT: Low AC input voltage event; results in a onetime momentary throttle for each
event to the maximum throttle state
2. Electrical Protection CLST: High output energy event; results in a throttling hiccup mode
with fixed maximum throttle time and a fix throttle release ramp time.
3. Thermal Protection CLST: High power supply thermal event; results in a throttling hiccup
mode with fixed maximum throttle time and a fix throttle release ramp time.
When the SMBAlert# signal is asserted, the fans will be gated by HW for a short period
(~100ms) to reduce overall power consumption. It is expected that the interruption to the fans
will be of short enough duration to avoid false lower threshold crossings for the fan tach
sensors; however, this may need to be comprehended by the fan monitoring FW if it does have
this side-effect.
ME FW will log an event into the SEL to indicate when the system has been throttled by the
SmaRT/CLST power management feature. This is dependent on ME FW support for this
sensor. Please refer ME FW EPS for SEL log details.
4.8.1.4.1
Dependencies on PMBus*-compliant Power Supply Support
The SmaRT/CLST system feature depends on functionality present in the ME NM SKU. This
feature requires power supplies that are compliant with the
PMBus Specification,
Revision 1.2.
4.9 EU Lot 6 Mode
The European Union has set forth a stringent standby power consumption target for systems
that are used as primary computing devices in office environments. Owing to the fact in office
environments, pedestal servers are being used more and more as workstations and that Value
servers could make their way into Home servers, this solution is being requested for some
pedestal servers. HW support for EU Lot6 will only be available for specific EPSD pedestal
products.
In order to meet the standby power requirements for EU Lot6 it is necessary to remove power to
the BMC, along with other components, when in the S5 state. As this operational mode impacts
system feature support, the user has the option of enabling and disabling this mode from the
BIOS setup screen utility.
BIOS is responsible for enabling/disabling the system hardware for EU Lot6 operation. It notifies
the BMC of the current state with the OEM command Set EULot6 Mode. The BMC saves the
state in persistent store and uses it to control special EU Lot6 internal processing during boot,
sensor monitoring, and so on as needed.
Summary of Contents for S2600IP
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