Data Sheet

Datasheet, Volume 1 of 2 89
Thermal Management
• Turbo Time Parameter (Tau): An averaging constant used for PL1 exponential
weighted moving average (EWMA) power calculation.
Note: Implementation of Intel
®
Turbo Boost Technology 2.0 only requires configuring PL1,
PL1 Tau, and PL2.
Note: PL3 and PL4 are disabled by default.
5.1.3.2 Platform Power Control
The processor supports Psys (Platform Power) to enhance processor power
management. The Psys signal needs to be sourced from a compatible charger circuit
and routed to the IMVP8 (voltage regulator). This signal will provide the total thermally
relevant platform power consumption (processor and rest of platform) via SVID to the
processor.
When the Psys signal is properly implemented, the system designer can utilize the
package power control settings of PsysPL1/Tau, PsysPL2 and PsysPL3 for additional
manageability to match the platform power delivery and platform thermal solution
limitations for Intel
®
Turbo Boost Technology 2.0. The operation of the PsysPL1/tau,
PsysPL2 and PsysPL3 is analogous to the processor power limits described in
Section 5.1.3.1.
• Platform Power Limit 1 (PsysPL1): A threshold for average platform power that will
not be exceeded - recommend to set to equal platform thermal capability.
• Platform Power Limit 2 (PsysPL2): A threshold that if exceeded, the PsysPL2 rapid
power limiting algorithms will attempt to limit the spikes above PsysPL2.
• Platform Power Limit 3 (PsysPL3): A threshold that if exceeded, the PsysPL3 rapid
power limiting algorithms will attempt to limit the duty cycle of spikes above
PsysPL3 by reactively limiting frequency.
Figure 5-1. Package Power Control