Regarding TEMPDIODE Pins, these pins connect to the internal temperature sensing diodes in the F-Tile transceivers.
Connect these pins to an external temperature sensing device to allow sensing of the F-Tile temperature. If not using the temperature sensing diode with an external temperature sensing device, leave these pins unconnected (NC).
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Please find the detailed product information here:
Agilex™ 7 (R31A/R31B/R31C) SoC FPGA System on Module