Frequency management on MAX V CPLD

Hi,

I just start working on Altera CPLD MAX V. I'm working on high speed system and i need an operating frequency on the range of 50MHz to 80 MHz to control a high speed LED's. The problem is that I'm obliged to use a "low" speed crystal oscillator as clock input (5-10MHz). I don't find a lot of information on the MAX V handbook's about frequency management, Also, in Altera website's they mention a DPLL feature but there is no more information about it, Thank you in advance