I need that constraint for the ASI IP.
If I remove the constraint I've the same result as now (20 path that have timing problems that will be resolved by that constraint for sure because they fail for less than 100ps in bad condition: the design still work now at ambient temperature, but I wanna be sure that all still work also later), moreover in the IP manual of the Altera Asi it's told to set theese constraints so I wanna them (also because if we release the FW and we'll have some problem and we'll resolve it putting the constraint, my chief ofc will kill me because it's an obvious thing to respect construnctor advise).