Globalfoundries 180nm IC LVS Testing

Explains how to test GF180nm LVS rule decks.

Folder Structure

📁 testing
 ┣ 📜README.md                       This file to document the regression.
 ┣ 📜Makefile                        To make a full test for GF180nm LVS rule deck.
 ┣ 📜run_regression.py               Main regression script used for LVS testing.
 ┣ 📁testcases                       All testcases used in LVS regression.

Prerequisites

You need the following set of tools installed to be able to run the regression:

  • Python 3.6+
  • KLayout 0.28.4+

We have tested this using the following setup:

  • Python 3.9.12
  • KLayout 0.28.5

Usage

    run_regression.py (--help| -h)
    run_regression.py [--device_name=<device_name>] [--mp=<num>] [--run_name=<run_name>]

Example:

    python3 run_regression.py --device_name=MOS --run_name=mos_regression

Options

  • --help -h Print this help message.

  • --mp=<num> The number of threads used in run.

  • --run_name=<run_name> Select your run name.

  • --device_name=<device_name> Target specific device.

To make a full test for GF180nm LVS rule deck, you could use the following command in testing directory:

make all

LVS Outputs

You could find the regression run results at your run directory if you previously specified it through --run_name=<run_name>. Default path of run directory is unit_tests_<date>_<time> in current directory.

Folder Structure of regression run results

📁 unit_tests_<date>_<time>
 ┣ 📜 unit_tests_<date>_<time>.log
 ┣ 📜 all_test_cases_results.csv
 ┗ 📜 rule_deck_rules.csv
 ┗ 📁 <device_name>
    ┣ 📜 <device_name>_lvs.log
    ┣ 📜 <device_name>.gds
    ┣ 📜 <device_name>.cdl
    ┣ 📜 <device_name>_extracted.cir                     
    ┣ 📜 <device_name>.lvsdb

The result is a database file for each device (<device_name>.lvsdb) contains LVS extractions and comparison results. You could view it on your file using: klayout <device_name>.gds -mn <device_name>.lvsdb, or you could view it on your gds file via marker browser option in tools menu using klayout GUI.

You could also find the extracted netlist generated from your design at (<device_name>.cir) in your run directory.