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In Altium Designer 16, improvements have been made to the Same-Net Clearance Rule that produce violations only for significant cases, i.e., ignoring cases that are not as significant. In previous Altium Designer versions, the Same-Net Clearance Rule could be defined, of course; however, it was applied in many cases that were not appropriate. In this release, we have improved the rule so that it ignores cases that are not valid violations. The most common case that is now ignored is when a track crosses the perimeter of another primitive, such as a pad or fill area. The Same-Net Clearance Rule is also useful for defining the “first corner rule” when exiting a pad and thus ensuring that tuning doesn’t create traces that are too close together.
The Same Net Only clearance rule is defined in the PCB Rules and Constraints Editor dialog (from a PCB document, click Design » Rules). In the Constraints region, hover the cursor on or near the current constraint and click the down arrow to access a drop down menu of choices that are specific for that rule and constraint. Click Same Net Only.
Using the Same-Net Clearance Rule now produces violations for the following:
Violations for Track to: Via, Pad, Fill, Region, or Polygon:
Violations for Track to Track:
Example of Parallel Tracks with overlap:
Examples of Parallel Tracks without overlap: if the two tracks are connected by another primitive, the violation is invalid if it is in the connect area, as in the following examples:
Examples of Non-parallel Tracks: if the two tracks are connected by another primitive, the violation is invalid if it is in the connect area, as in the following examples:
If two tracks touch each other, the violation is invalid.
Examples of Track-Non-Track: If the track centerline doesn't touch the non-track primitive and there is no connection between them, the violation is valid; otherwise the violation is invalid.
If the two primitives touch each other, the violation is invalid, otherwise the violation is valid.
In this example, the Same-Net Clearance Rule was set to 0.1mm.
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