Power Management—Processor

4.1Advanced Configuration and Power Interface (ACPI) States Supported

 

This section describes the ACPI states supported by the processor.

Table 9.

System States

 

 

 

 

State

Description

 

 

 

 

G0/S0

Full On Mode.

 

 

 

 

G1/S3-Cold

Suspend-to-RAM (STR). Context saved to memory (S3-Hot state 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 10.

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 state 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.

 

 

 

 

 

Execution cores in this state behave similarly to the C6 state. If all execution cores

 

C7

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. C7 may not be available on all SKUs.

 

 

 

Table 11.

Integrated Memory Controller States

 

 

 

 

State

Description

 

 

 

 

Power up

CKE asserted. Active mode.

 

 

 

 

Pre-charge

CKE de-asserted (not self-refresh) with all banks closed.

 

Power-down

 

 

 

 

 

Active Power-

CKE de-asserted (not self-refresh) with minimum one bank active.

 

down

 

 

 

 

 

Self-Refresh

CKE de-asserted using device self-refresh.

 

 

 

Table 12.

PCI Express* Link States

 

 

 

 

State

Description

 

 

 

 

L0

Full on – Active transfer state.

 

 

 

 

L0s

First Active Power Management low power state – Low exit latency.

 

 

 

 

L1

Lowest Active Power Management – Longer exit latency.

 

 

 

 

L3

Lowest power state (power-off) – Longest exit latency.

 

 

 

 

Intel® Xeon® Processor E3-1200 v3 Product Family

June 2013

Datasheet – Volume 1 of 2

Order No.: 328907-001

49