Problem with simulation and implementation of code in DE0 Nano Cyclone IV kit

Hi everyone:

The kit was ok, and the pin assingments are fine because I tested with other program and it works perfectly. But it seems that I did not have de .sdc. (the analysis and sinthesis gave me critical warnings about this) I searched online I found how to do it, and now I am doing it (by the way I do not understand very much what is the objective of it).

I did not post de code here because it has a size of 300 lines and it will be very complicated to follow it. I did my program one step at a time and tested at ModelSim with a testbench, but the problem was I suposed that would be enough and when I checked on the board it was to late and the code was too big. I will perform the analysis and synthesis of smaller parts of my program with the .sdc file created and I will post here the results. I will do what Anand says, wait for news guys. Thanks in advance and sorry for my english. http://www.alteraforum.com/forum//images/icons/icon10.png