Powering On Cold Standby Supplies During A Fault Or Over Current Condition; Bmc Requirements; Power Supply Turn On Function; Closed Loop System Throttling (Clst) - Intel R1000GZ Technical Product Specification

Standard
Redundancy
Cold Redundant
Active
Cold Standby 1
(02h)
Cold Standby 2
(03h)
Cold Standby 3
(04h)
Notes:
Maximum load share voltage = 8.0V at 100% of rated output power
These are example load share bus thresholds; for a given power supply, these shall be customized to maintain
the best efficiency curve for that specific model.
3.6.2

Powering on Cold Standby supplies during a fault or over current condition

When an active power supply asserts its CR_BUS signal (pulling it low), all parallel power supplies in cold
standby mode shall power on within 100μsec
3.6.3

BMC Requirements

The BMC uses the Cold_Redundancy_Config command to define/configure the power supply's roll in cold
redundancy and to turn on/off cold redundancy.
The BMC shall schedule a rolling change for which PSU is the Active, Cold Stby1, Cold Stby 2, and Cold Stby
3 power supply. This allows for equal loading across power supply over their life.
Events that trigger a re-configuration of the power supplies using the Cold_Redundancy_Config command.
o AC power ON
o PSON power ON
o Power Supply Failure
o Power supply inserted into system
3.6.4

Power Supply Turn On Function

Powering on and off of the cold standby power supplies is only controlled by each PSU sensing the Vshare
bus. Once a power supply turns on after crossing the enable threshold; it lowers its threshold to the disable
threshold. The system defines the 'position' of each power supply in the Cold Redundant operation. It will do
this each time the system is powered on, a power supply fails, or a power supply is added to the system.
The system is relied upon to tell each power supply where it resides in the Cold Redundancy scheme.
3.7

Closed Loop System Throttling (CLST)

The server system has support for Closed Loop System Throttling (CLST). CLST prevents the system from
crashing if a power supply module is overloaded. Should system power reach a pre-programmed power limit,
CLST will throttle system memory and/or processors to reduce power. System performance will be impacted
should this occur. For more in depth information about CLST implementation, please refer to the SmaRT &
CLST Architecture on "Romley" Systems and Power Supplies Specification (IBL Reference # 461024).
®
Intel Server System R1000GZ/GL Product Family TPS

Table 17. Example Load Share Threshold for Activating Supplies

Enable Threshold for
V
CR_ON_EN
NA; Ignore dc/dc_ active# signal; power supply is always
ON
NA; Ignore dc/dc_ active# signal; power supply is always
ON
3.2V (40% of max)
5.0V (62% of max)
6.7V (84% of max)
Disable Threshold for
V
CR_ON_DIS
3.2V x 0.5 x 0.9 = 1.44V
5.0V x 0.67 x 0.9 = 3.01V
6.7V x 0.75 x 0.9 = 4.52V
Revision 1.1
CR_BUS De-asserted / Asserted
States
OK = High
Fault = Low
OK = High
Fault = Low
OK = Open
Fault = Low
OK = Open
Fault = Low
OK = Open
Fault = Low
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