Virtex-4 designs containing RSDS_25 IO standards fail at BitGen with the following error messages:
"ERROR:DesignRules:698 - Blockcheck: Invalid IOB configuration. The comp TRIB has
a the DIFF_TERM attribute is set to TRUE or FALSE and should be set to #OFF
for not LDVS io standards.
ERROR:DesignRules:695 - Blockcheck: Invalid IOB configuration. The comp
OBUFDSRSDS has a DIFFO_OUTUSED or DIFFO_INUSED set for differential output
but an LVDS differential io standard has not been set.
ERROR:DesignRules:694 - Blockcheck: Invalid IOB configuration. The comp A has a
INBUFUSED and DIFFI_INUSED set for differential input but a differential io
standard has not been set."
This problem has been fixed in the latest 6.3i Service Pack available at:
The first service pack containing the fix is 6.3i Service Pack 2.