2.4.2.1 PLL Reference Clock Source

The following sources are available from the reference clock menu.

  • Dedicated Input Pad —The clock source is one of the four regular FPGA I/Os that have a dedicated path to the CCC. The Configure as differential option allows you to configure any dedicated Input Pad as differential I/O. The package pin names for the selected CCC location are displayed next to the dedicated pads.
  • FPGA Fabric Input —The clock source can be one of the four input signals coming from the FPGA Fabric.
  • Oscillators —The source is from the on-chip 50 MHz oscillator.
Figure 2-9. PLL Reference Clock Source
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