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RTL8101E-GR Datasheet(PDF) 18 Page - Realtek Semiconductor Corp. |
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RTL8101E-GR Datasheet(HTML) 18 Page - Realtek Semiconductor Corp. |
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18 / 28 page  RTL8101E-GR Datasheet Integrated Fast Ethernet Controller for PCI Express 13 Track ID: JATR-1076-21 Rev. 1.1 6.5. Power Management The RTL8101E 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 RTL8101E can monitor the network for a Wakeup Frame, a Magic Packet, or a Re-LinkOk, and notify the system via a PCI Express Power Management Event (PME) Message, Beacon, or 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 RTL8101E is in power down mode (D1 ~ D3): • The Rx state machine is stopped. The RTL8101E 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 RTL8101E 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 RTL8101E. • Transmission is stopped. PCI Express transactions are stopped. The Tx on-chip buffer is held. • After being restored to D0 state, the RTL8101E 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 (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: • 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, then 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). If EEPROM D3c_support_PME = 0: • If aux. power exists, then PMC in PCI config space is the same as EEPROM PMC (if EEPROM PMC = C2 77, then PCI PMC = C2 77) • 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 77, then PCI PMC = 02 76) In the above case, if wakeup support is not desired when main power is off, it is suggested that the EEPROM PMC be set to 02 76. |
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