Allegro/OrCAD Rigid Flex Design Creation Best Practices
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defined does not require creation of a stackup definition first followed by the addition of the layers.
The layer can be added first if that is more convenient:
1. Create the two new top layers using the Add Layers command above the TOP Conductor.
2. Use the Site-defined Mask layers EPOXY_TOP and STIFFENER_TOP.
3. Remove these selections from the Primary and FLEX_MAIN.
Note:
When defining the stackup, correct order of the layers is important. The structure that is being
defined in Cross Section Editor is used for documentation sent to the fabricator. The 17.2 release
Cross Section chart (discussed later in this document) relies on the information defined in the
cross section definition and should be as accurate as possible. Signal integrity tools also rely on
proper structure to provide more realistic analysis based on the materials, and the position of
those materials in the stackup.
4. Add a new stackup named FLEX_STIFFENER.
5. Use the Copy Stackup from option button and select FLEX_MAIN.
A copy of this stackup will require less work to build the definition of the stackup.
