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Altera_Forum's avatar
Altera_Forum
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16 years ago

How can i estimate a .pof file size？

i'm doing a project with EP3C, and the PCB is small, so i have to use the smallest area of ecps in the pcb. I read the file"cyc3_ciii51016.pdf",in table 9-3, it lists the size of .rbf. I wonder what the relation between .pof and .rbf. And can i think it's the maximum size of the .pof without .hex and anything else, or the size is fixed ?

3 Replies

  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    If you don't use compression, the size is fixed for any given device.

    If you use compression, it'll be smaller than the fixed size but will vary from design to design.
  • Altera_Forum's avatar
    Altera_Forum
    Icon for Honored Contributor rankHonored Contributor
    16 years ago

    that means i can think the size is fixed?and is it just decided by what the model i use ?

  • Altera_Forum's avatar
    Altera_Forum
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    16 years ago

    .rbf is the contents of the EPCS

    .sof has some more stuff like a header.

    To choose an EPCS device, all you need to know is the .rbf size. And if you use compression (available for free in EP3C FPGAs) it even gets smaller.