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Manual_PDK_installation.md

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DISCLAIMER: The following sections are to give you an understanding of what happens under the hood in the Makefile.

Prerequisites

Setting up the PDK: skywater-pdk

  • Clone and build at least one skywater-pdk standard cell Library inside the pdks directory:

    • To setup one standard cell library only
        export PDK_ROOT=<absolute path to where skywater-pdk and open_pdks will reside>
    cd  $PDK_ROOT
    git clone https://github.com/google/skywater-pdk.git
    cd skywater-pdk
    git checkout 3d7617a1acb92ea883539bcf22a632d6361a5de4
    git submodule update --init libraries/sky130_fd_sc_hd/latest
    git submodule update --init libraries/sky130_fd_sc_hvl/latest
    git submodule update --init libraries/sky130_fd_io/latest
    make timing
    • To setup other SCLs:
      • replace sky130_fd_sc_hd with any of the following list:
        • sky130_fd_sc_hs
        • sky130_fd_sc_ms
        • sky130_fd_sc_ls
        • sky130_fd_sc_hdll

  • Setup the configurations and tech files for Magic, Netgen, OpenLANE using open_pdks:

        cd $PDK_ROOT
    git clone https://github.com/RTimothyEdwards/open_pdks.git
    cd open_pdks
    git checkout 32cdb2097fd9a629c91e8ea33e1f6de08ab25946
    ./configure --with-sky130-source=$PDK_ROOT/skywater-pdk/libraries --with-sky130-local-path=$PDK_ROOT
	cd sky130
	make
	make install-local

Note: You can use different directories for sky130-source and local-path. However, in the instructions we are using $PDK_ROOT to facilitate the installation process

WARNING: Please, don't move sk130A from the installed directory because the generated .mag files contain absolute paths. Moving it will result in producing an invalid GDS.

  • To set the STD_CELL_LIBRARY (the default value is set to sky130_fd_sc_hd)

    • Open configuration/general.tcl

    • set STD_CELL_LIBRARY to one of the following:

        - sky130_fd_sc_hs
  - sky130_fd_sc_ms
  - sky130_fd_sc_ls
  - sky130_fd_sc_hdll

Refer to this for more details on the structure.