A minimum spacing rule is useful, but it cannot describe every channel interaction. Long parallel runs, reference geometry and discontinuities change the coupling problem.
What to examine in the layout brief
Identify the routes that remain adjacent over meaningful length and inspect their layer references. Compare placement and layer allocation before adding complex detours. Keep the victim and aggressor operating assumptions in the channel analysis.
What belongs in the release record
Document the spacing objective and the paths that still need verification. A single gap value cannot establish a universal crosstalk limit for all stackups.
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Numerical limits and acceptance criteria must come from the actual component documentation, supplier agreement and applicable standards. No proprietary standard tables are reproduced.