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82575 Ethernet Controller Design Guide
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logic input to the 82575 Ethernet Controller that denotes auxiliary power is available. If
AUX_PWR is asserted, the 82575 Ethernet Controller device will advertise that it
supports wake up from a D3cold state.
The 82575 Ethernet Controller device supports both Advanced Power Management
(APM) wakeup and Advanced Configuration and Power Interface (ACPI) wakeup. APM
wakeup has also been known in the past as “Wake on LAN” and as “Magic Packet Wake-
up”.
Wakeup uses the PE_WAKEn signal to wake the system up. PE_WAKEn is an active low
signal typically connected to a GPIO port on the chipset that goes active in response to
receiving a “Magic Packet”, a network wakeup packet, or link status change indication.
PE_WAKEn remains asserted until PME status is cleared in the 82575 Power
Management Control/Status Register.
3.4.4 Power Management
3.4.4.1 PCIe Power Management
The 82575 supports D0 and D3 power states defined in the PCI Power Management and
PCI Express Specifications. D0 is divided into two sub-states: D0u (D0 Un-initialized),
and D0a (D0 active). In addition, the 82575 supports a Dr state that is entered when
PE_RST_N is asserted (including the D3cold state).
The diagrams below show the power states and transitions between them.
Figure 7. Power Management State Diagram
Dr D0u
D0aD3
PERST# de-
assertion &
EEPROM read
done
PERST#
assertion
PERST#
assertion
PERST#
assertion
Write 11
to Power State
Write 00
to Power State
Enable
master or slave
Access
Internal_Power_On
_Reset assertion
Hot (in-band)
Reset
Write 11
to Power State