Back-Annotate Assignments

Discussion in 'VHDL' started by ALuPin, Oct 20, 2004.

  1. ALuPin

    ALuPin Guest

    Hi,

    what does back-annotate assignments exactly mean?

    Are the assignments of the current project saved in
    a separate file that is a safe copy?

    I would be thankful for your explanation.

    Rgds
    Andre
     
    ALuPin, Oct 20, 2004
    #1
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  2. Hi Andre,

    > what does back-annotate assignments exactly mean?


    It basically means that, for instance, pin locations chosen by Quartus are
    now converted to 'hard' assignments in the currently-used .qsf file.

    Quartus will let you go into all sorts of detail, down to individual LE
    placement. Most of the time you'll only want the pinout to be
    back-annotated.

    You will very likely get into trouble with your PCB guy though, as the
    automatic pin placements that Quartus produces are not the most optimal
    ones for PCB design.

    If you want to try out different pinouts, Quartus II 4.1 has the ability to
    create several revisions of a project, including different pinouts, logic
    options etc.

    Best regards,


    Ben
     
    Ben Twijnstra, Oct 20, 2004
    #2
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