When I attempt to generate an IBIS file for a Virtex-II Pro device using bidirectional pins, the following errors occur:
"IBISWriter: There is no buffer model available for the IOB at site M27 because the following configuration value is unsupported:
IBISWriter: There is no buffer model available for the IOB at site P30 because the following configuration value is unsupported:
This message may be repeated several times, followed by:
"ERROR:PostProcessors:38 - Xilinx IBISWriter has detected the above errors. No IBIS output file has been created. Please correct the errors and try running IBISWriter again. XIL_MEMUSAGE - process used 58589184 bytes of memory."
IBISWriter previously issued a fatal error when no buffer model was available; however, a warning is now issued, and an output.ibs file is still created.
This problem has been fixed in the latest 6.1i Service Pack, available at:
The first service pack containing the fix is 6.1i Service Pack 2.