Sure. Download the datasheet for the fpga you are using. Specifically read the chapter on "clocking resources". That gives you plenty of information, and will get you well underway to including a DCM in your design. Good luck!
PS: if that is too much work for you, then fire up coregen from ISE and click through the clocking wizard.
PPS: if that is too much work, google for some source code.
PPPS: if that is too much work, pursue a career in management or something.