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.