I get the following INFO message from the 'route_design -unroute' command:
INFO: [Route 35-24] Router failed to deposit pin-assignments on site SLICE_X53Y147. Reason: Duplicate instTerm: D.
When is this going to be fixed?
This is scheduled to be fixed in the next major release of the tools.
The work-around is to run 'route_design' without the -unroute option.