IBM Intel Xeon E5-2637 49Y8125 User Manual
Product codes
49Y8125
Intel® Xeon® Processor E5-1600/E5-2600/E5-4600 Product Families
87
Datasheet Volume One
Power Management
4
Power Management
This chapter provides information on the following power management topics:
• ACPI States
• System States
• Processor Core/Package States
• Integrated Memory Controller (IMC) and System Memory States
• Direct Media Interface Gen 2 (DMI2)/PCI Express* Link States
• Intel QuickPath Interconnect States
• System States
• Processor Core/Package States
• Integrated Memory Controller (IMC) and System Memory States
• Direct Media Interface Gen 2 (DMI2)/PCI Express* Link States
• Intel QuickPath Interconnect States
4.1
ACPI States Supported
The ACPI states supported by the processor are described in this section.
4.1.1
System States
4.1.2
Processor Package and Core States
lists the package C-state support as: 1) the shallowest core C-state that
allows entry into the package C-state, 2) the additional factors that will restrict the
state from going any deeper, and 3) the actions taken with respect to the Ring Vcc, PLL
state and LLC.
lists the processor core C-states support.
Table 4-1.
System States
State
Description
G0/S0
Full On
G1/S3-Cold
Suspend-to-RAM (STR). Context saved to memory
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.
Package C-State Support (Sheet 1 of 2)
Package C-
State
Core
States
Limiting Factors
Retention and
PLL-Off
LLC Fully
Flushed
Notes
1
PC0 - Active
CC0
N/A
No
No
2
PC2 -
Snoopable Idle
CC3-CC7
• PCIe/PCH and Remote Socket
Snoops
• PCIe/PCH and Remote Socket
Accesses
• Interrupt response time
requirement
• DMI Sidebands
• Configuration Constraints
• Configuration Constraints
VccMin
Freq = MinFreq
PLL = ON
Freq = MinFreq
PLL = ON
No
2