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Shape problem

I have vcc sape in the -ve ground plane but it is not voiding when give update shape ,If I defined the plave as +ve artwork then it is voiding (pls. find the attached fig.) and if i put any dummy via matrix automatically it will get connect to gnd . Kindly suggest how overcome above problem Best Regards, Girish Kumar

oldmouldy over 17 years ago

Split planes? Use positive artwork, check shapes are correctly defined a type "Dynamic" and have nets attached correctly, Shape>Select Shape or Void, check the Net setting in Options, then WHYSIWYG, other it will not be. Also check the the Thermal reliefs are correctly configured in the Shape>Global Dynamic Parameters and that you have the artwork format is set, RS274X recommended!
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girish over 17 years ago

Thanks for your feedback. I did the same thing split planes defined as +ve artwork & plane which not having split dfined as -ve plane .But the strange thing is that when via passes through these layer clearance to the via to shape will be the constrain value not the antipad dimension in +ve art work ,but the -ve artwork for clearance it will consider antipad dimension .(I didint understand what is "Net setting in Options, then WHYSIWYG") Best Regards, Girish Kumar
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oldmouldy over 17 years ago

That would all be correct. For Positive shapes, the default uses the Global Dynamic Parameters, or Shape Instance Parameters, and limits from teh Constraint Manager. Negative shapes use the Padstack definitions. So, Postive Shapes can have their parameters controlled through the menus and Constraint Manager, Negative Shapes need their padsatcks redesigned, a lot more work!
IF a shape on a Positive Plane, is Dynamic and has a net attached, What You See Is What You Get, as in the display will accurately reflect the final copper shape with voids when the shape is updated to Smooth.
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girish over 17 years ago

Thanks for more clarity ......... Cadence Forum helping more than a PDF doc.! Best Regards, Girish Kumar
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