The Realtek RTL8139C（L） is a highly integrated and cost-effective single-chip Fast Ethernet controller

　　that provides 32-bit performance， PCI bus master capability， and full compliance with IEEE 802.3u

　　100Base-T specifications and IEEE 802.3x Full Duplex Flow Control. It also supports Advanced

　　Configuration Power management Interface （ACPI）， PCI power management for modern operating

　　systems that are capable of Operating System Directed Power Management （OSPM） to achieve the most

　　efficient power management possible. The RTL8139CL is suitable for applications such as CardBus or

　　mobile devices with a built-in network controller. The CIS data can be stored in either a 93C56 EEPROM

　　or expansion ROM.

　　In addition to the ACPI feature， the RTL8139C（L） also supports remote wake-up （including AMD Magic

　　Packet， LinkChg， and Microsoft wake-up frame） in both ACPI and APM environments. The RTL8139C（L）

　　is capable of performing an internal reset through the application of auxiliary power. When auxiliary power

　　is on and the main power remains off， the RTL8139C（L） is ready and waiting for the Magic Packet or Link

　　Change to wake the system up. Also， the LWAKE pin provides 4 different output signals including active

　　high， active low， positive pulse， and negative pulse. The versatility of the RTL8139C（L） LWAKE pin

　　provides motherboards with the Wake-On-LAN （WOL） function. The RTL8139C（L） also supports Analog

　　Auto-Power-down， that is， the analog part of the RTL8139C（L） can be shut down temporarily according to

　　user requirements or when the RTL8139C（L） is in a power down state with the wakeup function disabled.

　　In addition， when the analog part is shut down and the IsolateB pin is low （i.e. the main power is off）， then

　　both the analog and digital parts stop functioning and power consumption of the RTL8139C（L） will be

　　negligible. The RTL8139C（L） also supports an auxiliary power auto-detect function， and will

　　auto-configure related bits of their own PCI power management registers in PCI configuration space.