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Earlier releases of the Xilinx Development System stored the physical design in a Logic Cell™ Array (LCA™) file. The current Xilinx Development System tools operate on physical designs in the NCD (Circuit Description) format. LCA files are ASCII (human-readable) files; NCD files are binary (machine-readable) files.
LCA2NCD converts an LCA file to an NCD file. The NCD file produced by LCA2NCD can be placed and routed, viewed in the FPGA Editor, analyzed for timing, and back-annotated in the current Xilinx Development System.
Figure 9.1 File Conversion Using LCA2NCD