I am lost in the PDK. Where do I find the layout of the bipolar devices e.g. pnp and npn ?

FatsieFS

04/21/2022, 12:49 PM

I am lost in the PDK. Where do I find the layout of the bipolar devices e.g. pnp and npn ?

FatsieFS

04/21/2022, 12:58 PM

Did find gds version in https://github.com/mabrains/sky130_klayout_pdk

Tim Edwards

04/21/2022, 1:57 PM

$PDK_ROOT/sky130A/libs.ref/sky130_fd_pr/gds/sky130_fd_pr.gds

. The layouts are all bundled together in the one library file. The defined device layouts are:

Copy code

sky130_fd_pr__pnp_05v5_W3p40L3p40
sky130_fd_pr__rf_pnp_05v5_W0p68L0p68
sky130_fd_pr__rf_pnp_05v5_W3p40L3p40
sky130_fd_pr__npn_11v0_W1p00L1p00
sky130_fd_pr__rf_npn_05v5_W1p00L1p00
sky130_fd_pr__rf_npn_05v5_W2p00L8p00
sky130_fd_pr__rf_npn_05v5_W2p00L4p00
sky130_fd_pr__rf_npn_05v5_W2p00L2p00
sky130_fd_pr__rf_npn_05v5_W1p00L8p00
sky130_fd_pr__rf_npn_05v5_W1p00L4p00
sky130_fd_pr__rf_npn_05v5_W1p00L2p00
sky130_fd_pr__rf_npn_11v0_W1p00L1p00
sky130_fd_pr__rf_npn_05v5_W5p00L5p00

Note that there are more layouts than there are models. There is no difference between those labeled

rf

and those that are not, other than the name.

FatsieFS

04/21/2022, 2:09 PM

👍

FatsieFS

04/21/2022, 2:13 PM

@User mmm, libs.ref/sky130_fd_pr/gds/ is empty on my installation; I am using version 1.0.301 Do I have to enable some configure option when building open_pdk ?

Tim Edwards

04/21/2022, 2:20 PM

Shouldn't be necessary. What configuration options are you giving?

FatsieFS

04/21/2022, 2:25 PM

Copy code

% ./scripts/config.status --config
'--enable-sky130-pdk' '--prefix=/home/verhaegs/eda/Chips4Makers/CIIC/sky130_1.0.301' '--enable-sram-sky130' '--enable-osu-t12-sky130' '--enable-osu-t15-sky130' '--enable-osu-t18-sky130'

Tim Edwards

04/21/2022, 2:27 PM

The important thing would be that if you are pointing to an installation of skywater-pdk outside of open_pdks, then the sky130_fd_pr submodule would need to be initialized; but since the GDS files are just copied from source to destination (and compiled into a single file along the way), you can also find these layouts in the original skywater-pdk source at, e.g.,

libraries/sky130_fd_pr/latest/cells/rf_npn_05v5/sky130_fd_pr__rf_npn_05v5_W1p00L1p00.gds

. Some of the PNP devices are not present as GDS in the skywater-pdk source, and I have put those layouts in the open_pdks source under

sky130/custom/sky130_fd_pr/gds/

Tim Edwards

04/21/2022, 2:29 PM

If you use

--enable-sky130-pdk

without specifying a path, then the PDK will be cloned into open_pdks

sources/sky130-pdk

. Is it possible that something happened to the skywater-pdk repository that is preventing submodule initialization?

FatsieFS

04/22/2022, 11:32 AM

I do get errors when building sky130. I do

make

in top directory and then it seems to call

make -j all

in sky130. This is on a 40-core server which seems to overload the memory in the server. I do seem to have the file

libs.ref/sky130_fd_pr/gds/sky130_fd_pr.gds

now.

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