This part is a kind of semiconductor called RTL8169.

Function of this product has GIGABIT ETHERNET MEDIA ACCESS CONTROLLER.

Manufacturers : Realtek Semiconductor

Image and pinout :

Some of the text within the PDF file :

www.DataSheet.co.kr RTL8169 REALTEK GIGABIT ETHERNET MEDIA ACCESS CONTROLLER WITH POWER MANAGEMENT RTL8169 1. Features 2 2. General Description 3 3. Block Diagram. 4 4. Pin Assignments .. 5 5. Pin Description 6 5.1 Power Management/Isolation Interface . 6 5.2 PCI Interface .. 7 5.3 FLASH/BootPROM/EEPROM/MII Interface ... 9 5.4 LED Interface... 10 5.5 GMII, TBI, PHY [ ... ]

RTL8169 PDF Datasheet Download