I have seen a piece of code in which there is elements such as FDP, BUFG and DCM. This code is to get different clocks from internal reference clock. I have simulated this but I cannot. These elements uses virtex2.FDP, virtex2.BUFG, ... so library virtex2 is used. My board is Virtex II Pro, so could I use this library?. I suppose that yes.
My question is about unisim and virtex2. Are these libraries similar?. Virtex2 is obsolete and now everyone use unisim.