1.5 Clocks

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PolarFire SoC devices offer two on-chip RC oscillators (2 MHz and 160 MHz) to generate  free-running clocks. The clocks do not have any I/O pads and do not require external components to operate.

The following table lists the number of RC oscillators available in PolarFire SoC devices.

Table 1-12. RC Oscillator Count
Resource	Supported Range (MHz)	MPFS250
On-chip oscillator	2	1
On-chip oscillator	160	1

you must understand the regional clock implications when targeting designs that might be migrated to different device sizes. It is important that you go through the pin planning before finalizing it on the board while targeting a die. For more information about clocking in PolarFire devices, see PolarFire FPGA and PolarFire SoC FPGA Clocking Resources User Guide.

For more information about the preferred clock inputs connectivity to PLLs, DLLs, and global clock network, see the Packaging Pin Assignment Table (PPAT) on the PolarFire documentation web page.