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i remove the bead,and find it is ok about the power supply.the output voltage is 1.496V. Both Vccpt and Vccio (BANK7 and BANK8) is using the same PTH0510w,but there is nothing wrong of Vccio (BANK7 and BANK8) .
what i can't understand is Vccio(BANK7 and BANK8) is ok, whlie Vccpt is short-circuited with GND, if there is something wrong of the power supply(PTH0510w).
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If I understand your description; you have removed the bead to VCCPT and powered the board, and VCCIO is correctly powered. If that is the case, then the power supply is fine. The problem is related to the VCCPT on the FPGA.
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And what i want to know is if there is something wrong about the FPGA itself,before the first
configuration.it's so expensive,and should not be so fragile.
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It does sound like the FPGA has been damaged in some way.
Could you please measure the power-on waveforms from the power controller. Perhaps it has some over-shoot on startup that exceeds the maximum voltage of the VCCPT power rail (as FvM suggested).
The problem with using a power module is that you have no control of the controller feedback loop. If you have put too much capacitance on the supply output, you may have changed the controller loop dynamics. Did you follow the power module recommendations for decoupling, or use more?
Cheers,
Dave
Honored Contributor
