As a way of identifying potential bridge locations in a design, I use Cadence Encounter / extractRC to get an SPEF file which I then parse to get bridge net pairs, essentially those that were identified as having a coupling capacitance. Now I wonder if this approach is valid, and I have a specific question. If there are two nets of the same metal layer running in parallel in close proximity, they will have a coupling capacitance and it will show in the SPEF file, but what if there is another net running between the two on the same metal layer? Will the two separated nets then show up in the SPEF file? The reason for my question is that if there is a net that separates the two, the likelihood of a bridge between them is dramatically reduced (as I work under a single fault assumption).
