Datasheet
State Description
C7
Execution cores in this state behave similarly to the C6 state. If all execution cores
request C7 state, L3 cache ways are flushed until it is cleared. If the entire L3 cache is
flushed, voltage will be removed from the L3 cache. Power removal to SA, Cores and L3
will reduce power consumption.
C8
C7 state plus voltage is removed from all power domains after required state is saved. PLL
is powered down.
C9 C8 state plus processor V
CC
input voltage at 0 V.
C10 C9 state plus VR12.6 is set to low-power state, near shut off.
Table 15. Integrated Memory Controller States
State Description
Power up CKE asserted. Active mode.
Pre-charge
Power-down
CKE de-asserted (not self-refresh) with all banks closed.
Active Power-
down
CKE de-asserted (not self-refresh) with minimum one bank active.
Self-Refresh CKE de-asserted using device self-refresh.
Table 16. G, S, and C Interface State Combinations
Global
(G)
State
Sleep (S)
State
Processor
Package (C)
State
Processor
State
System Clocks Description
G0 S0 C0 Full On On Full On
G0 S0 C1/C1E Auto-Halt On Auto-Halt
G0 S0 C3 Deep Sleep On Deep Sleep
G0 S0 C6/C7
Deep Power-
down
On Deep Power-down
G0 S0 C8/C9/C10 On
Deeper Power-
down
G1 S3 Power off Off, except RTC Suspend to RAM
G1 S4 Power off Off, except RTC Suspend to Disk
G2 S5 Power off Off, except RTC Soft Off
G3 NA Power off Power off Hard off
Processor Core Power Management
While executing code, Enhanced Intel SpeedStep
®
Technology optimizes the
processor’s frequency and core voltage based on workload. Each frequency and
voltage operating point is defined by ACPI as a P-state. When the processor is not
executing code, it is idle. A low-power idle state is defined by ACPI as a C-state. In
general, deeper power C-states have longer entry and exit latencies.
Enhanced Intel
®
SpeedStep
®
Technology Key Features
The following are the key features of Enhanced Intel SpeedStep Technology:
4.2
4.2.1
Processor—Power Management
5th Generation Intel
®
Core
™
Processor Family, Intel
®
Core
™
M Processor Family, Mobile Intel
®
Pentium
®
Processor Family, and
Mobile Intel
®
Celeron
®
Processor Family
Datasheet – Volume 1 of 2 March 2015
46 Order No.: 330834-004v1