IBM Intel Xeon E5-2648L 95Y4670 User Manual
Product codes
95Y4670
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
89
Datasheet Volume One
Power Management
4.1.4
DMI2/PCI Express Link States
Note:
L1 is only supported when the DMI2/PCI Express* port is operating as a PCI Express* port.
4.1.5
Intel QuickPath Interconnect States
4.1.6
G, S, and C State Combinations
Self-Refresh
CKE de-asserted. In this mode, no transactions are executed and the system
memory consumes the minimum possible power. Self refresh modes apply to
all memory channels for the processor.
• IO-MDLL Off: Option that sets the IO master DLL off when self refresh
occurs.
• PLL Off: Option that sets the PLL off when self refresh occurs.
In addition, the register component found on registered DIMMs (RDIMMs) is
complemented with the following power down states:
— Clock Stopped Power Down with IBT-On
— Clock Stopped Power Down with IBT-Off
Table 4-5.
DMI2/PCI Express* Link States
State
Description
L0
Full on – Active transfer state.
L1
Lowest Active State Power Management (ASPM) - Longer exit latency.
Table 4-4.
System Memory Power States (Sheet 2 of 2)
State
Description
Table 4-6.
Intel QPI States
State
Description
L0
Link on. This is the power on active working state,
L0p
A lower power state from L0 that reduces the link from full width to half width
L1
A low power state with longer latency and lower power than L0s and is
activated in conjunction with package C-states below C0.
Table 4-7.
G, S and C State Combinations
Global (G)
State
Sleep
(S) State
Processor
Core
(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
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
N/A
Power off
Power off
Hard off