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RTL8111E-VL-CG

INTEGRATED GIGABIT ETHERNET CONTROLLER FOR PCI EXPRESS APPLICATIONS

Realtek Semiconductor 

RTL8111E

Datasheet

6.6. Power Management

The RTL8111E complies with ACPI (Rev 1.0, 1.0b, 2.0), PCI Power Management (Rev 1.1), PCI

Express Active State Power Management (ASPM), and Network Device Class Power Management

Reference Specification (V1.0a), such as to support an Operating System-directed Power Management

(OSPM) environment.

The RTL8111E can monitor the network for a Wakeup Frame or a Magic Packet, and notify the system

via a PCI Express Power Management Event (PME) Message, Beacon, or the LANWAKEB pin when

such a packet or event occurs. Then the system can be restored to a normal state to process incoming jobs.

When the RTL8111E is in power down mode (D1~D3):

• The RX state machine is stopped. The RTL8111E monitors the network for wakeup events such as a

Magic Packet and Wakeup Frame in order to wake up the system. When in power down mode, the

RTL8111E will not reflect the status of any incoming packets in the ISR register and will not receive

any packets into the RX on-chip buffer.

• The on-chip buffer status and packets that have already been received into the RX on-chip buffer

before entering power down mode are held by the RTL8111E.

• Transmission is stopped. PCI Express transactions are stopped. The TX on-chip buffer is held.

• After being restored to D0 state, the RTL8111E transmits data that was not moved into the TX on-chip

buffer during power down mode. Packets that were not transmitted completely last time are

re-transmitted.

The D3cold_support_PME bit (bit15, PMC register) and the Aux_I_b2:0 bits (bit8:6, PMC register) in PCI

configuration space depend on the existence of Aux power. If aux. power is absent, the above 4 bits are

all 0 in binary.

Example:

If EEPROM D3c_support_PME = 1:

• If aux. power exists, then PMC in PCI config space is the same as EEPROM PMC

(if EEPROM PMC = C3 FF, then PCI PMC = C3 FF)

• If aux. power is absent, then PMC in PCI config space is the same as EEPROM PMC except the

above 4 bits are all 0’s (if EEPROM PMC = C3 FF, then PCI PMC = 03 7E)

In the above case, if wakeup support is desired when main power is off, it is suggested that the EEPROM

PMC be set to C3 FF (Realtek EEPROM default value).

Integrated Gigabit Ethernet Controller for PCI Express

16

Track ID: JATR-2265-11 Rev. 1.1

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