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Power Management
48 Datasheet, Volume 1
4.1 Advanced Configuration and Power Interface
(ACPI) States Supported
The ACPI states supported by the processor are described in this section.
4.1.1 System States
4.1.2 Processor Core / Package Idle States
4.1.3 Integrated Memory Controller States
Table 4-1. System States
State Description
G0/S0 Full On
G1/S3-Cold
Suspend-to-RAM (STR). Context saved to memory (S3-Hot is not supported by the
processor).
G1/S4 Suspend-to-Disk (STD). All power lost (except wakeup on PCH).
G2/S5 Soft off. All power lost (except wakeup on PCH). Total reboot.
G3 Mechanical off. All power removed from system.
Table 4-2. Processor Core / Package State Support
State Description
C0 Active mode, processor executing code
C1 AutoHALT state
C1E AutoHALT state with lowest frequency and voltage operating point
C3
Execution cores in C3 flush their L1 instruction cache, L1 data cache, and L2 cache
to the L3 shared cache. Clocks are shut off to each core
C6
Execution cores in this state save their architectural state before removing core
voltage
Table 4-3. 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