| # How to develop the " setRC.tcl " file from a captable for a foreign PDK ? |
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| Tool: Parasitics Extraction |
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| Subcategory: Setting up foreign PDK |
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| ## Conversation |
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| ### faisaladilquadery |
| I have a foreign PDK which I want to invoke in openroad. But for that I need to develop the setRC.tcl file. How do I accurately input the resistance and capacitance for the setRC.tcl file .
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| N.B : I have a captable for the pdk
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| I can also generate a spef file from Innovus for the PDK |
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| ### maliberty |
| @vvbandeira @luarss do we have any documentation for correlateRC ?
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| Note that if you LEF res & cap has values you can use those without a setRC to get started. |
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| ### vvbandeira |
| @faisaladilquadery
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| We have a section on the `setRC.tcl` file configuration in our platform bring-up documentation.
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| https://openroad-flow-scripts.readthedocs.io/en/latest/contrib/PlatformBringUp.html#setrc-configuration |
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| ### faisaladilquadery |
| Thankyou! @maliberty @vvbandeira . I have used the lef file in replacement of the setRC.tcl file . But I am getting **net delay** mismatch between the same path with the same cells for Innovus and OpenRoad. Any Idea why ? |
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| ### faisaladilquadery |
| Thankyou @maliberty I have used the the RCX flow you mentioned to generate a rc tech file for my pdk and used the tech file to generate a spef in ORFS to obtain a more accurate RC. |
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| ### b224hisl |
| > set_wire_rc is used to set a default layer to use when doing placement based parasitic estimation. There is no meaning to multiple layers here as there would be no way to divide up the estimate meaningfully.
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| So I'm confused why it needs to set jsut one layer, do you mean only placement based parasitic estimation is related to `set_wire_rc` ? If there' s no way to divide up the estimate meaningfully, the layer can be set randomly? |
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