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17268 Discussions

sof file format?

Altera_Forum
Honored Contributor II
‎04-06-2009 10:56 AM
3,227 Views

Hi, 

Stratix III Active Serial question: 

I would like to know how may bits in my EPCS device I'm actually using given a sof file. How do I do this? If I enable bit stream compression I assume that the number will reduce (seems obvious). 

 

Is there a sof file format document anywhere? I have searched, and can't seem to find anything useful. 

 

I program via the NIOS i.e. using the EPCS controller via JTAG i.e. I don't use a pof file via the EPCS programming header I have on my board. 

 

Thanks, 

Dave.
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Altera_Forum
Honored Contributor II
‎04-06-2009 04:52 PM
1,725 Views

Cause JTAG configuration doen't use compression, *.sof files have always full size. Compression option is valid e.g. for *.pof or *.rbf files. Generally the device handbook tells the size of uncompressed bitstreams.

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Altera_Forum
Honored Contributor II
‎04-06-2009 05:16 PM
1,725 Views

OK, I just read that I can use the compression option of sof2flash and so get compression that way (hopefully). 

 

I guess I can glean the size of the image from the resulting flash file. 

 

Thanks, 

Dave.
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Altera_Forum
Honored Contributor II
‎04-06-2009 05:27 PM
1,725 Views

Yes, also the Quartus Programming File converter tool, used e.g. to generate *.jic files for programming of AS configuration devices through JTAG does a later compression of bit streams from *.sif files.

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