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Intel
®
82575EB Gigabit Ethernet Controller — Auxiliary Power
Intel
®
82575EB Gigabit Ethernet Controller 324632-003
Software Developer’s Manual and EEPROM Guide Revision: 2.1
216 January 2011
Figure 23. Power States and Transitions
7.2 Auxiliary Power
If DisableD3Cold equals 0b, the 82575 uses the AUX_PWR indication that auxiliary power is available.
As a result, the 82575 advertises D3
cold
wakeup support. The amount of power required for the
function (this includes the entire NIC or LOM) is advertised in the Power Management Data Register,
which is loaded from the EEPROM.
If D3cold is supported, the PME_En and PME_Status bits of the Power Management Control/Status
Register (PMCSR) and their shadow bits in the Wake Up Control Register (WUC) are reset only by the
power up reset (detection of power rising).
The only effect of setting AUX_PWR to 1b is advertising D3
cold
wakeup support and changing the reset
function of PME_En and PME_Status. AUX_PWR is a strapping option in the 82575.
7.3 Form Factor Power Limits
The following table summarizes power limitations introduced by some of the different form factors.