Back-Annotate Assignments

[ALuPin]

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

 

[Ben Twijnstra]

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