Xilinx VC709 Manual page 26

VC709 FMC Si570 Fixed Frequency Overview
Description
– The FMC modules, XM101, XM104, and XM105 have a Silicon Labs Si570
Programmable Oscillator that defaults to 156.25 MHz. Via a series of
bitstreams, the frequency of this device can be changed. This tutorial shows
how to change the output frequency of these devices.
Note: Presentation applies to the VC709