In Constraint editor CES you have the possibility to use "Auto Assign Differential Pairs" to simplify the search of nets to be assigned as diff pairs.
So I start it and search for *_P and *_N
Nothing found. That is amazing, as during design I am sure I have put some diff pairs named nets
After hours of searching for the answer I type *_P* and *_N*. And presto all electrical nets are here:
To make it even more confusing, I decide to search for *_P^^^^ and *_N^^^ and suddenly even more nets show up
So now I am officially confused.
Why do electrical nets need to be searched with ^^^ or with a * at the end to be recognized?
- I would have expected them to be labeled with ^^^ only by the system for logical reason only and a search would not need to be linked with ^^^.
- What is more confusing is why do I find a different set of nets when I search with ^^^ as opposed to when I search with * at the end?
Has anyone a good explanation of this behavior?