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Altera_Forum
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10 years ago

Question about PIO

I have a nios system which interfaces an ADC through Qsys.I have about 20 no:s of PIO's configured for this.

16 PIOs for the databus from ADC,one for Chip select,one for adc reset,two for SOC of adc.when i create all the pio's its always showing the problem in nios that its not able to download the .elf file.If i reduce the no: of PIO's by 19,then i can download the program to nios.What can be the reason for this?

5 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    --- Quote Start ---

    I have a nios system which interfaces an ADC through Qsys.I have about 20 no:s of PIO's configured for this.

    16 PIOs for the databus from ADC,one for Chip select,one for adc reset,two for SOC of adc.when i create all the pio's its always showing the problem in nios that its not able to download the .elf file.If i reduce the no: of PIO's by 19,then i can download the program to nios.What can be the reason for this?

    --- Quote End ---

    Which PIO are you removing? Does the error go away if you remove anyone of the PIO's, or is it just specific to a certain one? If the problem is fixed by removing a PIO from lets say your adc reset, then you can point back to that as your issue.

    Can you post the error message(s) you are receiving?
  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    You may try to increase the memory size that use to store the software image.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    I have increased the onhip memory size.but still the same problem persists.

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    If i remove the Chip select pin of ADC,i can download the code. What is the reason for that?

  • Altera_Forum's avatar
    Altera_Forum
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    10 years ago

    If you identified that the chip select was the issue, you can trace down any connectivity issue on the board.