When Timing Analyzer crashes, a Fatal Error occurs. This is especially the case when multiple FROM TO constraints are used in the UCF file.
TS_P2P = MAXDELAY FROM TIMEGRP "PADS" TO TIMEGRP "PADS" 15 ns;
TS_ADD = MAXDELAY FROM TIMEGRP "dspaddr" TO TIMEGRP "dspdata" 25 ns;
FATAL_ERROR:Timing:bastwgraphedit.c:2262:220.127.116.11 - Error processing intersecting timing constraints! Process will terminate. For more information on this error, please consult the Answers Database or open a WebCase with this project attached at http://www.xilinx.com/support.
The issue will be fixed in 10.1 Service Pack 2, and it is available at: