WG82578DM S LGY6 Intel, WG82578DM S LGY6 Datasheet - Page 36

• Manufacturer Part Number: WG82578DM S LGY6
• Manufacturer: Intel

Specifications of WG82578DM S LGY6

• Lead Free Status / Rohs Status: Supplier Unconfirmed

6.4.2.1
Note:
6.4.2.2
29
Link Speed Battery Saver
Link speed battery saver is a power saving feature that negotiates to the lowest speed
possible when the 82578 operates in battery mode to save power. When in AC mode,
where performance is more important than power, it negotiates to the highest speed
possible. The Windows NDIS drivers (Windows XP and later) monitor the AC-to-battery
transition on the system to make the PHY negotiate to the lowest connection speed
supported by the link partner (usually 10 Mb/s) when the power cable is unplugged
(switches from AC to battery power). When the AC cable is plugged in, the speed
negotiates back to the fastest LAN speed. This feature can be enabled/disabled directly
from DMiX or through the advanced settings of the Window's driver.
When transferring packets at 1000/100 Mb/s speed, if there is an AC-to-battery mode
transition, the speed renegotiates to the lower speed. Any packet that was in process is
re-transmitted by the protocol layer. If the link partner is hard-set to only advertise a
certain speed, then the driver negotiates to the advertised speed. Note that since the
feature is driver based, it is available in S0 state only.
Link speed battery saver handles duplex mismatches/errors on link seamlessly by re-
initiating auto negotiation while changing speed. Link speed battery saver also supports
spanning tree protocol.
Packets are re-transmitted for any protocol other than TCP as well.
System Idle Power Saver (SIPS)
SIPS is a software-based power saving feature that is enabled only with Microsoft*
Windows* Vista* and Windows 7*. This feature is only supported in the S0 state and
can be enabled/disabled using the advanced tab of the Windows driver or through
DMiX. The power savings from this feature is dependent on the link speed of the
82578. Refer to
SIPS is designed to save power in the 82578 by negotiating to the lowest possible link
speed when both the network is idle and the monitor is turned off due to inactivity. The
SIPS feature is activated based on both of the following conditions:
Then, with both the monitor off and the network idle, the LAN negotiates to the lowest
possible link speed supported by both the PHY and the link partner (typically 10 Mb/s).
If the link partner is hard-set to only advertise a certain speed, then the LAN negotiates
to the advertised speed. This link speed is maintained until the LAN driver receives
notification from the operating system that the monitor is turned on, thus exiting SIPS
and re-negotiating to the highest possible link speed supported by both the PHY and
the link partner. If SIPS is exited when transferring packets, any packet that was being
transferred is re-transmitted by the protocol layer after re-negotiation to the higher link
speed.
• The Windows* Vista*/Windows 7* NDIS driver receives notification from the
• The LAN driver monitors the current network activity and determines that the
operating system when the monitor is turned off due to non-activity.
network is idle.
Section 6.1
for the power dissipated in each link state.
82578 GbE PHY—Power Management and Delivery