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Altera_Forum's avatar
Altera_Forum
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12 years ago

FPGA reconfiguration time

Hi Every one,

Is there any calculation regarding FPGA reconfiguration. When nconfig is pulled low for more than 500nsec and then release, reconfiguration will be initiated. But I couldn't able locate a method to know that what time it will take to reconfigure from serial configuration EPCS device (EPCS16S18N). Kindly help me.

Thanks,

Rajkumar

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    Too long :-)

    It depends on the amount of data to be loaded and the actual speed on the on-chip oscilator.

    There are some threads about failing to configure the fpga within the PCIe reset 'window' that give some indications of actual times.
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    Accepted, it will be too long but how much. Say I have 1MB pof, internal oscillator is 40MHz. I am looking for calculations, please provide if any available.

    Thank you,

    Rajkumar
  • Altera_Forum's avatar
    Altera_Forum
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    12 years ago

    --- Quote Start ---

    Say I have 1MB pof, internal oscillator is 40MHz. I am looking for calculations, please provide if any available.

    --- Quote End ---

    The data sheet for the device and the configuration device generally has these calculations already. Essentially it is the .rbf file (not the .pof) length divided by the worst-case AS-mode clock frequency (or 33MHz typical).

    Cheers,

    Dave