82575 Ethernet Controller Design Guide

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.

3.4.4Power Management

3.4.4.1PCIe 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.

Internal_Power_On

Hot (in-band)

_Reset assertion

Reset

PERST# de-

assertion &

EEPROM read

done

Dr

PERST# assertion

D0u

PERST# assertion

Write 11

to Power State

Write 00

to Power State

PERST# assertion

Enable

master or slave

Access

D3

Write 11

D0a

to Power State

Figure 7. Power Management State Diagram

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Intel 317698-001 manual PCIe Power Management

317698-001 specifications

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