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Zynq Z7020 on picozed fried during SW download

mashedcorn
I purchased a picozed 7Z20 and made a custom carrier board for it.  I was able to power it on and get the FPGA DONE LED to light up, I was able to program the Zynq chip PL through VIVADO, and I was able to begin programming the PS through vitis.  towards the end of downloading my SW to the board I lost JTAG connection and I am afraid my Z720 chip is now dead, it gets instantly hot when powered on and draws around 3x the current it did when I first booted it up. 
 
the board had been on for a fair amount of time, 10 minutes of power cycling it while trying to get it set up on a test bench, probably 5 minutes of me setting up and downloading the PL firmware a couple of times, 20 minutes between then and trying the SW download.
 
I'm wondering if anyone might have any insight into what went wrong here, Is it possible for the chip to overheat and kill itself?, I don't have any heatsink or fan on the chip but I figured there was some built in thermal protection but maybe I'm wrong.  Otherwise, I'm not sure what might have happened if it was working fine. I doubt JTAG programming could fry the chip
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    I hope your chip is still fine.  I don't have a lot of background on your specific problem.  However a couple of years ago I read through the the guide lines for designing a carrier board for the PicoZed.  I seem to remember that there was a very specific sequence for applying all the different power rails to the PicoZed.  Did you ensure that your carrier board respects the power sequencing requirements?

  • 0 in reply to dang74

    Yes I have a regulator for the VCCIO that only gets enabled once the power good signal comes from the module so power up should be respected, the rest of the boot up sequence is handled by the SOM. As I stated I was able to power up, it was detected, and I programed the board, the FPGA DONE light would light up correctly once booted. It is definitely dead as it gets too hot to touch very quickly.

  • 0 in reply to mashedcorn

    I was trying to stay hopeful but you might be correct in assuming that the device was damaged.  So strange that things seemed to go south during the software load.  I am not really an AMD/Xilinx guy so I can't really pin point what could have gone wrong here.

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