Issue link: https://resources.pcb.cadence.com/i/1310833
www.cadence.com 3 Cadence 3D Design Viewer This can be particularly useful in design reviews where a section of the design is being examined. (See Figure 5). Another useful feature is the ability to append multiple designs within one single 3D view. This is commonly used with Package-on-Package (PoP) designs or in cases where a multiple routing substrates are used within a single package. Interactive Markup During 3D design viewing an engineer can create "markup" jpeg snapshots for design reviews and/or design documen- tation that include the ability to add basic shapes, arrows and text. This is especially useful for communications with the design chain partners and test and assembly manufacturing departments. 3D Wirebond Clearance Design Rule Checking Stacked die or multi-tier single die designs with dense wirebond patterns run the risk of manufacturing issues where wires may touch each other. In order to maximize yield, manufacturing engineers require adequate spacing between wires. Otherwise wire sweep and sway may cause a short during the molding process. The 3D Design Viewer provides the functionality needed to validate these spacing requirements. Because the 3D Design Viewer leverages wire curvature information provided by wire bonding equipment providers as well as detailed height information in the design die stack, design rule checking can provide very accurate spacing checks. The rules are defined and stored as part of the Allegro Package Designer design session. Completely user-defined, they can be used to check wire to wire and wire to die interference checks. Figure 6 shows how the 3D Viewer enhances the designers debug capability—the "info" command highlights the DRC marker and the associated wirebonds as well as indicating the rule, rule value, and actual value. Figure 4: In a 3D view the designer can precisely visualize the transitions in and out of complex HDI vias Figure 5: Cadence 3D Design Viewer allows for detailed study of sections of a design to be sectioned out and visualized in 3D