Datasheet 29
Power Management
4Power Management
This chapter provides information on the following power management topics:
• Advanced Configuration and Power Interface (ACPI) States Supported
• Processor Core / Package Power Management
• System Memory Power Management
• Direct Media Interface 2 (DMI2) / PCI Express* Power Management
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 Package and Core States
The following table 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.