FPGA reconfiguration time

[Altera_Forum]

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

[Altera_Forum]

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]

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]

--- 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