Intel CM8062101038606 Computer Hardware User Manual


 
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
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
Table 4-2 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.
Table 4-3 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
VccMin
Freq = MinFreq
PLL = ON
No 2