RTL8111E-VL-CG データシートの表示（PDF） - Realtek Semiconductor

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RTL8111E-VL-CG

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS APPLICATIONS

Realtek Semiconductor 

RTL8111E

Datasheet

6.8.2. Protocol Offload

Protocol offload is a task offload supported by Microsoft Windows 7. It maintains a network presence for

a sleeping higher power host. Protocol offload prevents spurious wake up and further reduces power

consumption. It maintains connectivity while hosts are asleep, including receiving requests from other

nodes on the network, ignoring packets, generating packets while in the sleep state (e.g., the Ethernet

Controller will generate ARP responses if the same MAC and IPv4 address are provided in the

configuration data), and intelligently waking up host systems.

6.8.3. RSS Operation

After the parameters are set, the RTL8111E will start hash calculations on each incoming packet and

forward each packet to its correct queue according to the hash result. If the incoming packet is not in the

hash type, it will be forwarded to the primary queue. The hash result plus the BaseCPUNumber will be

indexed into the indirection table to get the correct CPU number. The RTL8111E uses three methods to

inform the system of incoming packets: inline interrupt, MSI, and MSIX. Periodically the OS will update

the indirection table to rebalance the load across the CPUs.

6.9. 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. 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 1.0V 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. 1.1

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