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Vic3Dexe's avatar
Vic3Dexe
Icon for Occasional Contributor rankOccasional Contributor
4 years ago
Solved

Cyclone III slave (PS) embedded memory errors

I have two Cyc III devices (master-slave, AS and PS respectively) + EPCS16 flash. In both devices I have ROMs (megafunction), one in the master and two of them in the slave. All ROMs are initialize...
  • Vic3Dexe's avatar
    Vic3Dexe
    3 years ago

    I think I've found the problem.

    There is a trace connected to pin 76 on the master and pin 99 on the slave. Trace is pulled up to 3.3V via 2.2k

    This **bleep** resistor was dead, and the trace was actually floating.

    I didn't use this pins before, so I can't reveal the resistor is dead.

    As I start to use it, all logic became a total mess. Something worked, something not. By elimination I found the culprit.

    I can't explain how this trace connected with loading errors (when FPGA not even in user mode), but the fact is - replacing resistor solved all problems, ROMs working now (though I don't use them anymore).

    Thanks to all, problem solved!

hareesh's avatar
hareesh
Icon for Frequent Contributor rankFrequent Contributor
4 years ago

please share Board schematics and layout, .qsys, the .sopcinfo files and platform design screen shot.

Vic3Dexe's avatar
Vic3Dexe
Icon for Occasional Contributor rankOccasional Contributor
4 years ago

The board included.

What are .qsys and .sopcinfo? Don't have these. Does quartus should generate them? How?

What you mean "platform design"? The board photo or what?

  • hareesh's avatar
    hareesh
    Icon for Frequent Contributor rankFrequent Contributor
    4 years ago

    hi

    may i know how are you booting the device (qspi or nand) ?

    thanks.

  • Vic3Dexe's avatar
    Vic3Dexe
    Icon for Occasional Contributor rankOccasional Contributor
    4 years ago

    I've told this about 5 times: I'm using EPCS16 serial flash. I don't know is it qspi or nand.