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Low Power Features
consumption allows for leakage current reduction, which results in platform power
savings and extended battery life. There is no platform-level change required to
support this feature as long as the VR vendor supports the VID-x feature.
2.6
Processor Power Status Indicator (PSI-2) Signal
The processor incorporates the PSI# signal that is asserted when the processor is in a
reduced power consumption state. PSI# can be used to improve intermediate and light
load efficiency of the voltage regulator, resulting in platform power savings and
extended battery life. The algorithm that the processor uses for determining when to
assert PSI# is different from the algorithm used in previous mobile processors. PSI-2
functionality improves overall voltage regulator efficiency over a wide power range
based on the C-state and P-state of the two cores. The combined C-state and P-state of
both cores are used to dynamically predict processor power. PSI-2 functionality is
expanded further to support three processor states:
• Both cores are in idle state
• Only one core is in active state
• Both cores are in active state
Datasheet
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