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Reuse Module with different stackup

markyd

I realize there is an old question with the same subject, but it's 8 years old and not really helpful. (https://community.cadence.com/cadence_technology_forums/pcb-design/f/pcb-design/28269/reuse-module-with-different-stackup)

The question is fundamentally the same, and i hope there is a solution for this now in 2022...  I'm currently using SPB 17.2, but i do have access to 17.4 if needed.

I have a project that is 6-layers.  It is going to be a small piece of several larger board designs that all have different stackups (from 10-18 layers).   Schematically, everything is happy, i've got the symbol in the other designs, everything packages, etc...   However, when i get to the PCB layout and try to Place the Module i receive the error message "(SPMHDB-277): Physical layers do not match".   I know they don't match and changing the physical layer names to match isn't really a good option in my opinion.

The ultimate question:  Is there a way to map the physical layers of the module to the physical layers of the board i'm placing it in?

If yes, how to do it?

If no, is there a reason this feature doesn't exist?  Seems this would be useful for hierarchical/modular designs

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    I don't know if there is a direct way to do this in Allegro, I'll look into though. There are some non-direct methods to do this which might get you close to what you want.

    1. You could use a combination of placement files and sub drawings to import your 6-layer board. Where things might get weird is with the vias, depending on what technology you are using.

    2. You could change the number of layers in your 6 layer design to match that of the 10-18 layer design. Just don't use the the extra layers. You might be able to get the reuse modules to work this way.

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  • 0

    I don't know if there is a direct way to do this in Allegro, I'll look into though. There are some non-direct methods to do this which might get you close to what you want.

    1. You could use a combination of placement files and sub drawings to import your 6-layer board. Where things might get weird is with the vias, depending on what technology you are using.

    2. You could change the number of layers in your 6 layer design to match that of the 10-18 layer design. Just don't use the the extra layers. You might be able to get the reuse modules to work this way.

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