The Realtek RTL8139D(L) is a highly integrated and cost-effective single-chip Fast Ethernet controller. Providing a highly flexible multi-function mode (Realtek patent pending), the new chip is able to support a versatile combination of applications. Furthermore, the RTL8139D(L) is equipped with a PCI and Boot ROM share interface (Realtek patent pending) for both EPROM and Flash Memory to provide maximum network security and ease of management.