Issue link: https://resources.pcb.cadence.com/i/1180288
Allegro/OrCAD Rigid Flex Design Creation Best Practices _______________________________________________________________________ Learn more at Cadence Online Support - https://support.cadence.com Page 8 © 2016 Cadence Design Systems, Inc. All rights reserved worldwide. may now be included as part of the stackup definition. The stackup definition for flex and rigid designs commonly includes a single stackup definition where the design has a single uniform layer stackup cross section. PCB designs that leverage material inlay or rigid-flex technology, use non-uniform stackups across the design with two or more different layer stackup definitions. Cross Section Editor in 17.2 provides the ability to define these multiple stackup definitions. The selection of materials used in a design have an impact on the performance, producibility, and function of a design. Careful attention should be given to the selection and use of materials and it should be in accordance with the company's standards. However, the key in getting proper stackup materials is the collaboration with the intended fabricator(s) who will provide proper materials. Proper choices made in the preliminary phases of the design will help to eliminate issues later in the design and fabrication process. The materials.dat file should always be updated with the latest materials. Many of the mask layers and material used should also be maintained in the materials.dat file. In 17.2, the introduction of a Mask Layer Site File assists the user in specifying the stackup definition for assigning different mask type layers. The materials and their definitions in the materials.dat file are referenced from the Mask Layer Site File. Mask Layer Site File Maintaining consistent layer names, materials, and stackup data is possible by using the Cross Section Technology File to import and export the stackup data. Creating a library of standard stackups for rigid PCBs is a minor task compared to the limitless possibilities that rigid-flex designs offer. Maintaining common layer names for the many mask and dielectric structures used in a rigid-flex design can be better managed using the new Mask Layer Site File. The Mask Layer site file should be accessible to all the users and located within the MATERIALPATH env definition in Allegro PCB Editor. Edit the file using the Edit – Site File menu command in Cross Section Editor. The Mask Layer site file editor allows the user to add, delete, and modify material entries for use in the stackup definition. The data provided in the Mask Layer site file assists the user in maintaining consistency between designs. The materials approved by company policies, should be listed in this file along with the intended function type, based on the IPC-2581 data exchange standards.