RTL8111E Ver la hoja de datos (PDF) - Realtek Semiconductor

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RTL8111E

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS APPLICATIONS

Realtek Semiconductor 

RTL8111E

Datasheet

6.10. Energy Efficient Ethernet (EEE)

The RTL8111E supports IEEE 802.3az Draft 3.2, also known as Energy Efficient Ethernet (EEE), at

10Mbps, 100Mbps, and 1000Mbps. This standard is being developed by the IEEE 802.3az Task Force,

and should be finalized by September 2010. It provides a protocol to coordinate transitions to/from a

lower power consumption level (Low Power Idle mode) based on link utilization. When no packets are

being transmitted, the system goes to Low Power Idle mode to save power. Once packets need to be

transmitted, the system returns to normal mode, and does this without changing the link status and

without dropping/corrupting frames.

To save power, when the system is in Low Power Idle mode, most of the circuits are disabled, however,

the transition time to/from Low Power Idle mode is kept small enough to be transparent to upper layer

protocols and applications.

EEE also specifies a negotiation method to enable link partners to determine whether EEE is supported

and to select the best set of parameters common to both devices.

Refer to http://ieee802.org/3/interims/index.html for more details.

7. Switching Regulator

The RTL8111E incorporates a state-of-the-art switching regulator that requires a well-designed PCB

layout in order to achieve good power efficiency and lower the output voltage ripple and input overshoot.

Note that the switching regulator 1.05V output pin (REGOUT) must be connected only to DVDD10,

AVDD10, and EVDD10 (do not provide this power source to other devices).

Note: Refer to the separate RTL8111E layout guide for details.

Integrated Gigabit Ethernet Controller for PCI Express

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Track ID: JATR-2265-11 Rev. 1.5

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