Data Sheet

Ethernet Controller I210 —Power Management
162
5.2.5 Link Disconnect
In any of D0u, D0a, D3, or Dr power states, the I210 enters a link-disconnect state if it detects a link-
disconnect condition on the Ethernet link. Note that the link-disconnect state in the internal PHY is
invisible to software (other than the PHPM.Link Energy Detect bit state). In particular, while in D0 state,
software might be able to access any of the I210 registers as in a link-connect state.
5.2.6 Device Off States
Note: One single device off mode can be enabled in the Flash at the same time, either Static or
Dynamic Device Off mode.
5.2.6.1 (Static) Device Off
The I210 enters a global power-down state when the DEV_OFF_N pin is asserted and the relevant Flash
bits were configured as previously described (see Section 4.4.4 for more details on DEV_OFF_N
functionality).
5.2.6.2 Dynamic Device Off
The I210 enters a global power-down state dynamically, each time all of the following conditions are
met:
•The I210 Dynamic Device Off Enable Flashbit (word 0x1E bit 14) was set (default hardware value is
disabled).
• WoL and Proxy functionalities are not required
• Manageability does not require the link. This occurs if:
— Manageability is disabled or
— Manageability mode is NC-SI and the conditions described in Section 10.6.2.2 are fulfilled.
•
When in this state, the direction of SDP pins is either maintained or the pins are moved to High
Impedance according to a setting made in SDP_DDOFF_EN bit in Flash word 0x0A.
Refer also to Section 3.7.8.5.7.
5.3 Power Limits by Certain Form Factors
Table 5-1 lists power limitation introduced by different form factors.
Table 5-1. Power Limits by Form-Factor
Note: This auxiliary current limit only applies when the primary 3.3 V voltage source is not available
(the card is in a low power D3 state).
Form Factor
LOM PCIe add-in card (10 W slot)
Main N/A 3 A @ 3.3 V
Auxiliary (aux enabled) 375 mA @ 3.3 V 375 mA @ 3.3 V
Auxiliary (aux disabled) 20 mA @ 3.3 V 20 mA @ 3.3 V