NIOS2 Clock Source?

Hi all,

I am trying to use a Nios2 Processor on my custom designed board of Cyclone iv GX.

I have an external 125Mhz diff clk.
Can i use a PLL inside my FPGA, Using the above external crystal as clock source and give clock to my NIOS2 processor.

Please give u r comments.

Regards,
Iyan