Device Migration Guidelines: Agilex™ 5 FPGAs and SoCs D-Series
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3.7.3.6. System PLL in Downbonded Quads
Take note of the System PLL resource count in the device that you select and the device you plan to migrate to, that consist of the downbonded GTS transceiver bank.
Each downbonded GTS transceiver bank contains one System PLL that can be fed to the FPGA Core. You need to pre-plan and connect the System PLL reference clock pins on the board first if you are planning to migrate from a smaller device variant to a bigger device variant within the same supported package. Refer to the GTS Transceiver PHY User Guide for more information.