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Layout Porting between Foundries

KKANDOTH

Hi All,

   Is It possible to port an existing layout from Foundry1 to Foundry2. Consider the existin layout has only metal & Via layers.

Thank You,

Kumar

  • Hi Kumar

    Yes, it is possible. The easiest approach is as follows:
    - Export gds file using the pdk from foundry1
    - Modify the gds mapping file from foundry2 to ensure that it uses the same metal and via gds mapping as foundry1
    - Import the gds file using pdk from foundry2

    Alternatively, you can modify the OA layer numbers in pdk from foundry2 to match the OA layer numbers from foundry1 and then open up the layout directly using the modified pdk. This should work too.

    Best regards
    Quek

  • Hi Quek,

    Thank You very much for your help.

    Since the risk hidden in the techfile modification is slightly huge, I started using dbwriteskill function. Do you foresee any issue if i start handling this at device level ?

    Thank You,

    Krishna

  • Hi Krishna

    If your layout also contains pcells, then it is not possible to resolve the problem by simply modifying the OA layer numbers.Using gds approach is the best. Using dbWriteSkill would also not be a good idea.

    Best regards
    Quek

  • Hi Quek, Yes, the final objective is to convert layout(pcells via All layers) from F1 to F2. I am expecting 50% manual effort. But still it would help me to start from half way rather than from scratch. Thanks, Krishna

  •  If there are compatible pcells and design rules, you may be able to get started but there is lots of potential issues.

    1. Until conversion is complete, you have a library which is in a state between two processes technologies. First, back up the design library. Make a map of the layer numbers from F1 PDK to F2 PDK. The layer data is stored as numbers in the database, although the design tools deal with layer names. Then attach the new PDK technology library. Go through all non pcells and map the layers to the new PDK. Update the via placements as well (you will have mapped them as well).

    2. For pcells, you have to replace the instances with the pcells from the new PDK. Get the parameters from the instances of the pcells from the F1 PDK and then replace the instances with the appropriate F2 PDK pcells. Map the parameters to the new pcell parameters.

    3. Run DRC and clean up the mess. LVS will probably not run because the pcells will have changed their footprint and there are gaps and shorts you will have to clean up.

    Cadence used to have a tool Migrate which would help you do this but I don't know if it is still in the catalog.

     Ted

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