Description
Altera® IBIS files are available in the Quartus® II software and the Altera web site download center. Unlike the Quartus II software, Altera can update the web information real-time and, as such, the web could contain more up to date versions of the IBIS files.
However, this can easily be checked by referencing the IBIS file version number from the Quartus II software against the file version available on the Altera web site.