From now on, as you make or break any connections in the database, the teardrops and tapers will automatically adjust to the changes. If you only require fillets in certain areas of the drawing, you can add gloss keepout areas. Add the NO_FILLET attribute to any nets which do not need them, and in your cross-section, turn on filleting for the layers requiring the process. Make sure that fillets are enabled in the fillet configuration form and set up which pad shapes need teardrops and the shape they should take. To work in this mode, turn on dynamic teardrops and tapers in the settings. Eliminate the hassles of a correct-by-design flow where you can’t add the route because a fillet can’t be placed, leading you to question where the problem is or how to correct it. Doing so, you get real-time feedback where more spacing is needed to get an ideal route. With dynamic mode enabled, choose the design-and-correct (allow DRCs) flow this mode will create the teardrops, even if they are in DRC conflict with a nearby object. In the early stages of your design, having teardrops enabled ensures that routing is valid. What capabilities do you have in the 17.2 tools and how do you take advantage of them through all phases of the design cycle? Phase 1: Dynamic teardrops and tapers By freeing you of the responsibility for managing these objects, more time can be focused on other design complexities, such as routing your high-speed nets. This is why the Cadence® Allegro® tool suite offers full dynamic filleting and tapering abilities for designers. They impact surrounding plane shape voiding and push neighboring segments. To get an accurate, complete design ready for analysis or manufacturing, teardrop and taper elements MUST be present. If you swap a via to a padstack of a different definition or size, remove a trace into a pad (potentially causing the pad to be removed completely if there are no other connections), change the entry angle, update a line width, or cross through a constraint region there are countless ways to impact the teardrops and tapers. However, any time you modify your design, these items need to be updated. They act to smoothen the intersection of the two objects, eliminating acute angle acid traps while also contributing to better signal integrity along the path. These two core concepts appear in nearly any PCB or IC package substrate today. Teardrops (also called fillets) are the blending area of a cline entry into a pad, while tapers are the gradual transition from one line-width to another along a path.
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