```IO SYNC 0 BASE SDC FILE dir base user proj example sdc RU open-source-silicon.dev #openlane

```IO_SYNC": 0, "BASE_SDC_FILE": "dir::base_us...

samarth jain

10/25/2024, 10:37 AM

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IO_SYNC": 0,
    "BASE_SDC_FILE": "dir::base_user_proj_example.sdc",
    "RUN_CVC": 1,
    "pdk::sky130*": {
        "FP_CORE_UTIL": 45,
        "RT_MAX_LAYER": "met4",
        "scl::sky130_fd_sc_hd": {
            "CLOCK_PERIOD": 25
        },
        "scl::sky130_fd_sc_hdll": {
            "CLOCK_PERIOD": 10
        },
        "scl::sky130_fd_sc_hs": {
            "CLOCK_PERIOD": 8
        },
        "scl::sky130_fd_sc_ls": {
            "CLOCK_PERIOD": 10,
            "SYNTH_MAX_FANOUT": 5
        },
        "scl::sky130_fd_sc_ms": {
            "CLOCK_PERIOD": 10
        }
    },
    "pdk::gf180mcuC": {
        "STD_CELL_LIBRARY": "gf180mcu_fd_sc_mcu7t5v0",
        "CLOCK_PERIOD": 24.0,
        "FP_CORE_UTIL": 40,
        "RT_MAX_LAYER": "Metal4",
        "SYNTH_MAX_FANOUT": 4,
        "PL_TARGET_DENSITY": 0.45
    }
}

I want to understand the meaning of RT MAX Layer? IS There a document for these parameters in config.jason?

Vijayan Krishnan

10/25/2024, 10:40 AM

During routing stage maximum layer allowed

Mitch Bailey

10/25/2024, 11:01 AM

@samarth jain ~~It should be here but it’s not.~~ 🙁　It’s defined in the pdk configuration.

Mitch Bailey

10/25/2024, 11:03 AM

Maybe it’s not directly used by openlane, but used as default values for other variables as documented in the above file.

Vijayan Krishnan

10/25/2024, 11:06 AM

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DRT_MAX_LAYER

This is for latest OpenLane, for caravel MPW tag still using RT_MAX_LAYER only

👍 1

donn

10/27/2024, 12:31 PM

RT_MAX_LAYER is documented in https://github.com/The-OpenROAD-Project/OpenLane/blob/master/docs/source/reference/pdk_configuration.md

👍 1

donn

10/27/2024, 12:31 PM

Screenshot 2024-10-27 at 15.31.11.png

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