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Chapter 5 Input/Output Interfaces
5-34 Compaq iPAQ Family of Internet Devices
First Edition – March 2000
5.9.3 POWER MANAGEMENT SUPPORT
The 82559 controller features Wired-for-Management (WfM) support providing system wake up
from network events (WOL) as well as generating system status messages (AOL) and supports
both APM and ACPI power management environments. The controller receives 3.3 VDC
(auxiliary) power as long as the system is plugged into a live AC receptacle, allowing support of
wake-up events occuring over a network while the system is powered down or in a low-power
state.
5.9.3.1 APM Environment
The Advanced Power Management (APM) functionality of system wake up is implemented
through the system’s APM-compliant BIOS and the controller’s Magic Packet-compliant
hardware. This environment bypasses operating system (OS) intervention allowing a plugged in
unit to be turned on remotely over the network (i.e., “remote wake up”). In APM mode the
controller, will respond upon receiving a Magic Packet, which is a packet where the node’s
address is repeated 16 times. Upon Magic packet detection, the controller intitiates the boot
sequence.
5.9.3.2 ACPI Environment
The Advanced Configuration and Power Interface (ACPI) functionality of system wake up is
implemented through an ACPI-compliant OS
and is the default power management mode
. The
following wakeup events may be individually enabled/disabled through the supplied software
driver:
♦
Magic Packet – Packet with node address repeated 16 times in data portion
NOTE
: The following functions are supported in NDIS5 drivers but implemented through
remote management software applications (such as LanDesk).
♦
Individual address match – Packet with matching user-defined byte mask
♦
Multicast address match – Packet with matching user-defined sample frame
♦
ARP (address resolution protocol) packet
♦
Flexible packet filtering – Packets that match defined CRC signature