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foss-eda-tools / third_party / opencircuitdesign.com / open_pdks / 466cc9132cecc17112ae8069ec2ae8bf4ab4ce7a
commit466cc9132cecc17112ae8069ec2ae8bf4ab4ce7a[log] [tgz]
authorAnton Blanchard <anton@linux.ibm.com>Tue Aug 23 14:06:18 2022 +1000
committerAnton Blanchard <anton@ozlabs.org>Tue Aug 23 14:06:18 2022 +1000
tree5546346ee231d4adeff2b15b1e7e66bbcfdc5934
parent6003ab31478184bceedc76eb650d8812e0cd6f5b [diff]
sky130B missing THICKNESS LEF props, breaking antenna repair

On a recent tape out of Microwatt I noticed an absence of any
antenna diodes as well as no antenna violations reported at the signoff
step.

It turns out we are stripping the THICKNESS properties from the sky130B
tech LEF, meaning all side area calculations come out as zero.

While fixing this, I also noticed filecmp.cmp only checks stat values
by default. It incorrectly determines that the sky130A and sky130B tech
LEFs are identical because the sizes and timestamps match, and creates
a symlink. Use shallow=False to force an actual comparison of the
contents.
2 files changed
tree: 5546346ee231d4adeff2b15b1e7e66bbcfdc5934
  1. .github/
  2. common/
  3. gf180mcu/
  4. runtime/
  5. scripts/
  6. sky130/
  7. .gitignore
  8. configure
  9. docs.txt
  10. LICENSE
  11. Makefile.in
  12. README.md
  13. VERSION
README.md

Open-PDKs (open_pdks)

Summary:

Automatic setup of PDKs for open-source tools from foundry sources.

Builds out and populates a new set of directories and subdirectories in the efabless format, with the efabless name for the PDK at the top, followed by categories “libs.ref” (IP) and “libs.tech” (EDA tool setup), each with subcategories corresponding to layout, abstract views, netlists, etc. for the IP; and magic, netgen, qflow, etc., for the EDA tool setup.

The populated PDK directories can contain either copies of files from the foundry sources, links to the foundry sources, or links back to another PDK.

Generates magic layout views for all vendor IP for which either a GDS view or a LEF view exists. Annotates the views as needed to handle ports, bounding boxes, etc.

This distribution contains sources for building out the SkyWater SKY130 130nm process. Sources for the foundry process data must be obtained separately. Read the README file in subdirectory sky130/ for instructions on obtaining and building the SkyWater sky130A PDK.

License:

Open_PDKs is open-source software distributed under the Apache-2.0 license. See file LICENSE for the complete license text.

Instructions:

git clone https://github.com/RTimothyEdwards/open_pdks.git
cd open_pdks
./configure [options]
make
[sudo] make install

where the configure [options] are specific to each foundry PDK supported by open_pdks and can be queried using

./configure --help

At a minimum you will want to pass a configure option to declare the location of the PDK vendor source distribution (which can be obtained separately),

./configure --enable-[PDK_name]-pdk=[path]

The open_pdks version of the PDK can be built locally within open_pdks without the need to declare an install target or run “make install”. However, it is recommended to declare a target location and install there, using

./configure --prefix=[path] --enable-[PDK_name]-pdk=[path]

followed by “make” and “make install”.

Also see the website at http://opencircuitdesign.com/open_pdks/. The “Install” page has full instructions for configuring and installing open_pdks.