Package Constraints Supported by the Void Generator

The void generator honors the following constraints:

pkgMinSpacing: Specifies the minimum spacing between a signal shape and a dynamic shape. Therefore, this value indicates the width of voids. The pkgMinSpacing values are defined in the technology file. The values differ for different types of signal object and nets:
pkgMinAperture: Specifies the minimum width of a piece of metal. Such pieces can be created by voiding a dynamic shape.

If a part of conducting shape is too narrow, the void generator removes it so that there is no violation of the minAperture constraint, as shown in the following image:
pkgMinArea: Specifies the square root of the minimum area of a metal shape. This constraint applies to the conducting shapes resulting from voiding dynamic shapes. The void generator generates void shapes so that there is no violation of the pkgMinArea constraint. The pkgMinArea is applicable to individual layers. To apply the constraint to all layers, use pkgMinAreaDefault.

To match the use model in the Allegro platform, all conducting shapes smaller than minArea are voided, even if there are no remaining parts of the dynamic shape.