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T O P I C R E V I E W
hippenstiel
Posted - 03 Aug 2015 : 16:41:18 Hello,
I've been using class-to-class spacing and templates. The copper pour usually fills perfectly according to the defined rules. In certain areas, I would like to override the class-to-class rules and have smaller spacings. So I define an area with "override within area / Track and Via styles..." set and another class-to-class rule for this area. A simple example is shown in the screenshot (design file is attached):
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The upper net (Net1) is member of Class1, the lower net (Net2) and the template are member of Class2. The regular spacing between Class1 and Class2 is 4mm. Within "3mm_area" it's 3mm.
I can't quite figure out the result. For some objects the new rules are applied, others keep the old spacings. For example: Why has Pad 2 of C2 4mm spacing and Pad 1 has 3mm spacing? And why is the spacing increasing back to 4mm at the right end of the track.
Does anyone have an explanation for this behaviour?
Posted - 04 Aug 2015 : 14:59:45 Thanks for the explanation!
steve
Posted - 04 Aug 2015 : 09:55:54 At the junction of a point where the spacing rules applied could be different such as an Area border, as in this example 3 mm or 4 mm spacings, then the larger will prevail. So for the right-hand track segment end, its Net Class dictates 3 mm spacing inside the area and 4 mm outside. However a short section of the track end is within 4 mm of the Area border and so under the influence of the external rules, so they apply. On the left-hand side the track segment traversing the Area boundary and the component pad 2 are within 4 mm, so they also receive the external rules.
This approach ensures the larger spacings apply in such cases and DRC will also be happy.
Template_and_Design_Rule_Override_Area.pcb