EP80579 Datasheet, PDF (178/1916 Pages) Intel Corporation – Intel® EP80579 Integrated Processor Product Line

Intel^® EP80579 Integrated Processor
Any device the system turns off because it is not actively in use can be turned on with
short latency. (What “short” means depends on the device. An LCD display needs to
come on in sub-second times, while it is generally acceptable to wait a few seconds for
a printer to wake.)
Precise definitions for Gx, Dx, Sx and Cx states are given in Table 6-7, Table 6-8,
Table 6-9, and Table 6-10.
Table 6-7.
Global Power States
Global
Power State
Description
G3
Mechanical
Off
G2/S5 Soft
Off
G1 Sleeping
G0 Working
A computer state that is entered and left by a mechanical means (for example, turning off the
system's power through the movement of a large red switch). Various government agencies
and countries require this operating mode. It is implied by the entry of this off state through a
mechanical means that no electrical current is running through the circuitry and that it can be
worked on without damaging the hardware or endangering service personnel. The OS must be
restarted to return to the Working state. No hardware context is retained. Except for the real-
time clock, power consumption is zero.
A computer state where the computer consumes a minimal amount of power. No user mode or
system mode code is run. This state requires a large latency in order to return to the Working
state. The system's context will not be preserved by the hardware. The system must be
restarted to return to the Working state. It is not safe to disassemble the machine in this
state.
A computer state where the computer consumes a small amount of power, user mode threads
are not being executed, and the system “appears” to be off (from an end user's perspective,
the display is off, and so on). Latency for returning to the Working state varies on the wake
environment selected prior to entry of this state (for example, whether the system should
answer phone calls). Work can be resumed without rebooting the OS because large elements
of system context are saved by the hardware and the rest by system software. It is not safe to
disassemble the machine in this state.
A computer state where the system dispatches user mode (application) threads and they
execute. In this state, peripheral devices (peripherals) are having their power state changed
dynamically. The user can select, through some UI, various performance/power characteristics
of the system to have the software optimize for performance or battery life. The system
responds to external events in real time. It is not safe to disassemble the machine in this
state.
Table 6-8.
Device States
Device
State
Description
D3 Off
D2
D1
D0 Fully-On
Power has been fully removed from the device. The device context is lost when this state is
entered, so the OS software will reinitialize the device when powering it back on. Since device
context and power are lost, devices in this state do not decode their address lines. Devices in
this state have the longest restore times. All classes of devices define this state.
The meaning of the D2 Device State is defined by each device class. Many device classes may
not define D2. In general, D2 is expected to save more power and preserve less device context
than D1 or D0. Buses in D2 may cause the device to lose some context (for example, by
reducing power on the bus, thus forcing the device to turn off some of its functions).
The meaning of the D1 Device State is defined by each device class. Many device classes may
not define D1. In general, D1 is expected to save less power and preserve more device context
than D2.
This state is assumed to be the highest level of power consumption. The device is completely
active and responsive, and is expected to remember all relevant context continuously.
Intel^® EP80579 Integrated Processor Product Line Datasheet
178
August 2009
Order Number: 320066-003US