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AR# 23187

8.1i PAR - SelectIO banking rules violation without incompatible bank voltages


When I run PAR, the error below is issued:

"ERROR:Place:311 - The IOB XLXN_1 is locked to site PAD191 in bank 7. This
violates the SelectIO banking rules. Other incompatible IOBs may be locked to
the same bank, or this IOB may be illegally locked to a Vref site."

I have verified that all the IOStandards in that bank require the same VCCOand VREFand that the I/O in the error is not in a VREF site. What else could be causing the error?


This error also occurs when you lock an I/O to a site that also has a prohibit constraint. The message will be improved in a future design tools release.

To eliminate the error, remove one of the conflicting constraints.
AR# 23187
Date Created 09/04/2007
Last Updated 12/15/2012
Status Active
Type General Article
  • Virtex-4 FX
  • ISE - 8.1i
  • ISE - 8.1i sp1
  • ISE - 8.1i sp2
  • ISE - 8.1i sp3