WG82578DM S LGY6 Intel, WG82578DM S LGY6 Datasheet - Page 35

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

Specifications of WG82578DM S LGY6

• Lead Free Status / Rohs Status: Supplier Unconfirmed

Power Management and Delivery—82578 GbE PHY
Table 8.
6.4
6.4.1
Note:
Note:
6.4.2
Figure 7 Notes
Power Saving Features
This section provides information about the low power configurations for the 82578.
Intel
Intel
automatically reduces the PHY to a lower power state when the power cable is
disconnected. When the power cable is reconnected, it renegotiates the line speed
following IEEE specifications for auto negotiation. By default, auto negotiation starts at
1 Gb/s, then 100 Mb/s full duplex/half duplex, then 10 Mb/s full duplex/half duplex.
ACBS is only supported during auto negotiation. If link is forced, the 82578 does not
enter ACBS mode.
82578 ACBS works in both S0 and Sx states. Since 82578 ACBS has no driver control,
the feature is always enabled, allowing power savings by default.
The crystal clock drivers are intermittently disabled when the network cable is
unplugged and the 82578 is in ACBS mode.
Automatic Link Downshift
Automatic link downshift is a collection of power saving features that enable a link
downshift from 1000 Mb/s to a lower speed to save power under different conditions
like the AC cable plugged in, monitor idle, or entering Sx states.
Note
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2
3
4
5
6
®
®
Auto Connect Battery Saver for the 82578 is a hardware-only feature that
MAC sends an in-band power-down message through SMBus or PCIe or LAN_DISABLE_N pin set to
zero.
Once the 82578 detects the power-down message or LAN_DISABLE_N transitions to a logic zero, the
PHY enters a power-down state.
The PCIe link (if enabled) enters electrical idle state.
PCIe/SMBus exits a reset state and performs link initialization.
MAC configures the 82578 through the MDIO interface.
PHY goes through auto-negotiation to acquire link.
Auto Connect Battery Saver (ACBS)
Description
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