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FPGA-based solutions have become more common in embedded systems these days. These systems need to communicate with external world. Considering high-speed and popularity of Ethernet communication, a reliable real-time Ethernet component inside FPGA is of special value. To that end, this paper presents a new solution for 100 Mb/s FPGA-based Ethernet communications with timing analysis. The solution deals with "Reduced Media-Independent Interface" in its physical layer. UDP is the network protocol which is implemented from physical to transport layer. For getting used in real-time applications, timing analysis is done in the communication system. Component based software engineering is used in the design and development processes. In order to test the components inside FPGA, two different approaches are utilized. Signal measurement in combination with introduced windows based application contributes much in testing and validation phases.