When my system contains the FFTx block and the target device is Virtex-II, Virtex-II Pro, or Spartan-3, the following error message occurs on generation of the HDL code:
""Synthesis Exception" The CORE Generator cannot generate the Fast Fourier Transform core, fast_fourier_transform_virtex2p_2_0_ed1e2e95c6abb2ad, as an error occurred during synthesis. ERROR: SimGenerator: Failure of Sim to implement customization parameters core fast_fourier_transform_virtex2p_2_0_ed1e2e95c6abb2ad."
In the coregen.log file the following error occurs:
ERROR: SimGenerator: Failure of Sim to implement customization parameters core fast_fourier_transform_virtex2_2_0_204439682f1f731c
ERROR: Did not generate EDIF implementation netlist (.EDN) file for core <fast_fourier_transform_virtex2_2_0_204439682f1f731c>.
ERROR: Errors encountered while generating fast_fourier_transform_virtex2_2_0_204439682f1f731c (Fast Fourier Transform 2.0). No output files have been generated.
ERROR: Errors occurred at line 22. GENERATE
ERROR: Errors found during execution of command file coregen.cgxco"
This CORE Generator error occurs usually when the device files for the target device were not installed during the ISE installation.
To solve this issue, reinstall ISE with the appropriate device installation files.