(XNF) A Hardware Description Language for electronic circuit design, developed by Xilinx, Inc.. Xilinx-developed tools use XNF and handle the details of the FPGA architecture. Converters are available for a number of widely-used HDLs - for example Verilog (xnf2ver) - so that designers can use familiar tools to develop Logic Cell Array designs. In addition, XNF can be converted to the input language of different logic simulators.