PCIe power supply in FPGA

aminpix · Oct 31, 2023

I am designing a board with a Kintex7 (ultrascale+) FPGA and PCIe. This FPGA should communicate through PCI express Gen4. I wonder the corresponding VCCIO or the bank power supply should be 1.8 or 1.2 or 3.3V?
I know ultrascale+ doesn't support 3.3V as VCCIO.

FvM · Oct 31, 2023

PCIe uses GTH or GTY transceivers, depending on the device, which wasn't mentioned yet. Refer to the respective transceiver user guide for details.

The GTH transceiver Quad requires three analog power supplies:
• MGTAVCC at a nominal voltage level of 1.0 VDC for UltraScale FPGAs and 0.9 VDC for
UltraScale+ FPGAs
• MGTVCCAUX at a nominal voltage level of 1.8 VDC
• MGTAVTT at a nominal voltage level of 1.2 VDC.

--- Updated Oct 31, 2023 ---

It's also a good idea to study dev kit designs as reference.

PCIe power supply in FPGA

aminpix

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FvM

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PCIe power supply in FPGA

aminpix

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