General Description: When I run PAR, the following message is reported during the routing phase:
"IMPORTANT MSG: IRRATIONAL TIMING! SWITCHING TO RESOURCE MODE; (EASE CONSTRAINTS) Phase 6: 0 unrouted; (2436759) REAL time: 1 hrs 58 mins 37 secs."
The intent of the message is to indicate that over-constrained paths exist in the design and that the router has switched to a non-timing driven mode for those paths. Timing analysis may be run on the routed design to examine the timing failures.
As this message is poorly worded, it will be rewritten for a future release.