This looks like an implemenation issue. You should use the Timing Analysis to find out where you critical path is, and try to add the apporiate pipeliing. But there could be some other issue so you will need to resolve but that will require you to look at the PAR log file.
can it be an issue with the precision?I was using a precision of 30_15 till then.But later when in tired with a pecision of 16_5 it got solved.can you give any suggestions?
