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Altera_Forum
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11 years ago

Cyclone IV fails to configure below -20C

I have a Cyclone IV design that operates correctly down to -20C but fails to configure below that temp. I have attached the schematic for the configuration block along with a scope trace showing configuration at room temp. I unfortunately don't have a complete scope trace at cold temp yet, however conf_done never goes high below -20C. If the temperature is ramped up from -40C the device starts working correctly around -20C. Can anyone have a quick look and see if I have botched the configuration set up. This is my 1st experience with Altera devices and I'm at a loss. All devices are rated at -40C or better.

Thanks

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  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    Hi murr32,

    What is the operating temperature range of the CIV device that you are using?
  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    I did notice I have the MSEL pins tied to 3.3V instead of 2.5V (VccA). This was copied from another design which does work to below -40C so I don't think that is what is causing my problem.

  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    --- Quote Start ---

    Flash memory that you use is EPCS from Altera? What's its operating temperature range?

    --- Quote End ---

    Temp range of Altera EPCQ is -40C to +85C, part number EPCQ16SI8N
  • Altera_Forum's avatar
    Altera_Forum
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    11 years ago

    Flash memory that you use is EPCS from Altera? What's its operating temperature range?