RTL8169S-32/RTL8169S-64
Datasheet
6.7. Power Management
The RTL8169S is compliant with ACPI (Rev 1.0, 1.0b, 2.0), PCI Power Management (Rev 1.1), and
Network Device Class Power Management Reference Specification (V1.0a), such as to support an
OS-directed Power Management (OSPM) environment.
The RTL8169S can monitor the network for a Wakeup Frame, a Magic Packet, or a Re-LinkOk, and notify
the system via PME# when such a packet or event occurs. Then, the whole system can be restored to a
normal state to process incoming jobs.
When the RTL8169S is in power down mode (D1 ~ D3):
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The Rx state machine is stopped, and the RTL8169S monitors the network for wakeup events such as a
Magic Packet, Wakeup Frame, and/or Re-LinkOk, in order to wake up the system. When in power
down mode, the RTL8169S will not reflect the status of any incoming packets in the ISR register and
will not receive any packets into the Rx FIFO buffer.
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The FIFO status and packets that have already been received into the Rx FIFO before entering power
down mode are held by the RTL8169S.
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Transmission is stopped. PCI bus master mode is stopped. The Tx FIFO buffer is held.
After restoration to a D0 state, the RTL8169S transfers data that was not moved into the Tx FIFO 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 (bit15, PMC) = 1.
If EEPROM D3cold_support_PME bit (bit15, PMC) = 0, the above 4 bits are all 0's.
Example:
If EEPROM D3c_support_PME = 1:
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If Aux. power exists, then PMC in PCI config space is the same as EEPROM PMC
(if EEPROM PMC = C2 F7, then PCI PMC = C2 F7).
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 = C2 F7, the PCI PMC = 02 76).
In the above case, if wakeup support is desired when main power is off, it is suggested that the EEPROM
PMC be set to C2 F7 (Realtek EEPROM default value).
Integrated Gigabit Ethernet Controller (NIC)
20
Track ID: JATR-1076-21 Rev. 1.7
REALTEK [ Realtek Semiconductor Corp. ]
