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Occurrences reference designator assignment in complex hierarchical design

Hi all,

consider this AN

when he says:

"Note: As a part will have more than one occurrence in a complex hierarchical design, it is essential that all these occurrences have a unique reference designator in the design. For this, the yellow columns for the parts must have unique reference designator. Therefore, for a complex hierarchical design, the preferred mode of annotation is Occurrence. This ensures that each occurrence gets a unique reference designator."

what does it means?
when in occurrence annotation mode,
1)sub-circuit reference designators change automatically at each hierarchical block placement/copy action
2)user have to change sub-circuit reference designators at each hierarchical block placement/copy action

I'm asking this because maybe I misunderstand and / or I forgot to set something
if I copy a hierarchical block, the reference designator does not change automatically, and I want that it does.

I had some problems also manually change the reference designator in sub-circuits by double click text to open the display properties dialog, changes made in one occurrence affects other occurrences and other weird things ...
the only way is to change the reference designator manually in property editor view.

i'm using Orcad Capture 16.6-S032.

Thanks

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EngineerPerson over 9 years ago

Hi Bill,

It is good to hear your vote of confidence in hierarchical designs in Cadence. Can you provide any insight on the 'tricks' that you mentioned? I haven't been able to find any way to keep the software from deleting all my occurrence data every time I cut/paste a hierarchical block (even with the 'design level' option checked). This also deletes the reference designators, and replaces them with a new ref des, which is SOMETIMES the same as the original (maybe 75% of the components?). Losing the synchronization between schematic and PWB ref designators is not really a good recipe for a maintainable design... Talking with Cadence support, we've identified that this is a bug with the software, but if you have a workaround I would be very curious to know what it is. I'm at the point of needing to flatten a 150 page extremely complex hierarchical schematic, so any clues you can provide would be appreciated.

Thanks!

Jeff
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EngineerPerson over 9 years ago

Hi Bill,

It is good to hear your vote of confidence in hierarchical designs in Cadence. Can you provide any insight on the 'tricks' that you mentioned? I haven't been able to find any way to keep the software from deleting all my occurrence data every time I cut/paste a hierarchical block (even with the 'design level' option checked). This also deletes the reference designators, and replaces them with a new ref des, which is SOMETIMES the same as the original (maybe 75% of the components?). Losing the synchronization between schematic and PWB ref designators is not really a good recipe for a maintainable design... Talking with Cadence support, we've identified that this is a bug with the software, but if you have a workaround I would be very curious to know what it is. I'm at the point of needing to flatten a 150 page extremely complex hierarchical schematic, so any clues you can provide would be appreciated.

Thanks!

Jeff
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