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BrianM's avatar
BrianM
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
Solved

Changed PERST# to 1.8V and Quartus crashed.

If you tell me I can't make PERST# 1.8V compatible, I'm going to have to rework my board. Here is the dump from the code: Problem Details Error: Internal Error: Sub-system: FIOMGR, File: /qua...
BrianM's avatar
BrianM
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

FYI: for anyone else who finds this thread in the future. On the Cyclone V, the PERST# pin is 3.3V only and Quartus will crash (bug!) as shown above if it isn't set to 3.3V. The software should not allow you to change it.

To use a 1.8V only BGA NVMe (ie Swissbit) you need to add a reverse biased schottky diode in series with the signal to the NVMe so the an FPGA low will pull the signal low, but a high will simply let the signal go to whatever pullup is on the BGA package.

I think Swissbit dropped the ball on this, since 3.3V is the PCIe specification for the signal.

  • ShengN_altera's avatar
    ShengN_altera
    Icon for Super Contributor rankSuper Contributor
    4 years ago

    Hi BrianM,

    Appreciate your helpful information on this thread. It really matter to community. I’m also glad that your question has been resolved.

    I now transition this thread to community support. If you have a new question, feel free to open a new thread to get the support from Intel experts. Otherwise, the community users will continue to help you on this thread. Thank you.

    Best regards,
    Sheng

    p/s: If any answer from the community or Intel support are helpful, please feel free to give Kudos.