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Altera_Forum's avatar
Altera_Forum
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13 years ago

Nios using onchip memory resets continuously

I am using a small footprint EP4CE6 FPGA with NIOSII built using 20KB on chip memory. Using Eclipse IDE I built the "small hello world" example as a starting point. My problem is that when I add anything more than a simple alt_printf statement, the cpu continuously resets itself.

I think it may be because I am not setting up the complier correctly. The instructions refer to the old NIOS IDE. I would like to know how to set these using the ECLIPSE IDE.

- Define the preprocessor option ALT_NO_INSTRUCTION_EMULATION

- Set Periodic system timer and Timestamp timer to none

- Set Max file descriptors to 4

- Uncheck Clean exit (flush buffers)

and any other settings you think is necessary to run NIOS CPU with on-chip memory only.

Thanks,

nathan

2 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    How large is your onchip memory? I've seen this happen when I had too small of memory.

  • Altera_Forum's avatar
    Altera_Forum
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    --- Quote Start ---

    How large is your onchip memory? I've seen this happen when I had too small of memory.

    --- Quote End ---

    20KB. I generated Qsys system as per the NiosII hardware Development tutorial.