Table 568: Power Management Behavior For The Network Device Class; Table 569: Power Management Policy For The Network Class - Broadcom BCM5722 Programmer's Manual

Programmer's Guide
10/15/07
The ACPI 2.0 specification defines power management behavior for device classes differently. For example, audio device
states D0–D3, are not similar to modem device states. Refer to Appendix A of the ACPI 2.0 specification for a detailed dis-
cussion of device power management.
device class.

Table 568: Power Management Behavior for the Network Device Class

State Implementation Requirement
D0 Required
D1 Optional
D2 Optional
D3 Required
The power management policy for the network class specifies how a network device behaves at a Dx power state (see
Table 569). For example, a device, not the wire-speed of the device, needs to wake up during WOL mode. A network wake
up may be initiated by a Magic Packet or similar unique packet format.
Current State Next State
D0 Dx
D0 D3
D1/D2/D3 D0
Document 5722-PG101-R
Table 568 (ACPI 2.0 spec) shows the power management behavior for the network

Table 569: Power Management Policy for the Network Class

Cause/Effect
• Cause = System enters sleep state S1-S4
• Effect = If wake is enabled, the lowest Dx state is chosen for the network device.
There is one limitation, in that the Dx state must support the wakeup.
• Cause = System initiated network shutdown
• Effect = System enters sleep state. The device may provide wake capability, but it is
not required.
• Cause = System wakeup.
• Effect = Device moves to full-power operation.
Bro adco m Co rp or atio n
Definition
Device is powered on and running.
Device delivers full functionality.
No bus transactions allowed.
No bus reception allowed.
No interrupts can occur.
Device context may be lost.
No bus transactions allowed.
No bus reception allowed.
No interrupts can occur.
Device context may be lost
No bus transactions allowed.
No bus reception allowed.
No interrupts can occur.
Device context is lost.
Advanced Configuration and Power Interface
BCM5722
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