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Avionic Full-Duplex Switched Ethernet (AFDX) is one of the most promising solutions developed in recent years for implementing high-bandwidth Avionic Data Networks (ADNs) that can support the increasingly high information flow required by modern avionic systems. Although AFDX commercial products are available, developing custom implementations using generic software and hardware, without depending on third-party products, allows identifying practical challenges and constraints, prototyping and characterizing new architectures, testing new algorithms, as well as performing validation and verification in the early stage of development. In this paper, we show how an AFDX switch fabric hardware core can be designed and implemented on an FPGA to facilitate the prototyping of a generic ADN in an early development stage.