Issue link: https://resources.pcb.cadence.com/i/1180284
Electrical Design, Mechanical Design Incremental Data Exchange in Allegro PCB Editor October 2019 18 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Restriction areas for vias are defined by geometries in the Allegro drawing class VIA KEEPOUT, and limited to subclasses TOP, BOTTOM, ALL. Any exported via keep-out area defined on any other subclass may be exported as subclass ALL. Height Restriction Management A maximum height restriction from the MCAD tool passed to Allegro is defined through a package keep-out area with an associated max height value (Package_Height_Max). The MCAD designer should pay special attention in how the restriction value is represented. Allegro PCB Editor uses the Package_Height_Max property attached to the package keep- out geometry to identify the maximum allowable height allowed in the defined area. If the Allegro symbol maximum height value is greater than the keep-out area maximum height value, a violation will be reported. The modeling of a height restriction defined in an MCAD tools may vary. The methodology used by PCB Editor based on max/min height values permits the placement of symbols beneath other symbols, also known a shadowing. If an Allegro symbol is defined with a max height (Package_Height_Max) value less than the min height