pad '%s' is unusable: unknown logic function. </a></td>
  <td align="left"><a href="#" onClick="open_man('NAME<br>       OPT-1022 (warning) IO pad &quot;%s&quot; is unusable: unknown logic function.<br><br>DESCRIPTION<br>       This  warning indicates that the logic function associated with that IO<br>       pad is not known. As a result, it will not be considered during IO  pad<br>       insertion and/or optimization.<br><br>WHAT NEXT<br>                            Version K-2015.06<br>            Copyrigh