Troubleshooting IHP OpenPDK DRC Documentation And Execution

Hey everyone,

I've been wrestling with the IHP OpenPDK Design Rule Check (DRC) documentation, and it seems like I'm hitting a few snags. I'm hoping someone can shed some light on this. It feels like the documentation might not be entirely in sync with the current PDK, or maybe I'm just missing something obvious, which is totally possible, guys!

My PDK installation is based on the May 25 version of the IIC-OSIC-TOOLS, but these questions seem relevant even to the latest state on GitHub. So, let's dive into the details and see if we can figure this out together. I want to help other users who face the same issues while using IHP OpenPDK.

Understanding the IHP OpenPDK File Structure

One of my first hurdles is figuring out the correct base folder for the DRC. According to the documentation (https://ihp-open-pdk-docs.readthedocs.io/en/latest/verification/drc/04_01_folder_struct.html), I should be looking for a specific directory structure. I initially thought the base folder might be https://github.com/IHP-GmbH/IHP-Open-PDK/tree/dev/ihp-sg13g2/libs.tech/klayout/tech/drc. However, this directory doesn't contain the images, testing, and rule_decks folders that the documentation mentions. This discrepancy is a major stumbling block for me, as these folders are crucial for running the DRC effectively. Identifying the correct base folder is the first step in ensuring that the DRC process runs smoothly and accurately. Without this foundational understanding, any subsequent attempts to perform DRC are likely to be unsuccessful. This underscores the importance of clear and up-to-date documentation, especially when dealing with complex software and design tools. Accurate documentation serves as a guide and a reference, enabling users to navigate the system effectively and avoid common pitfalls. I believe clarifying this aspect of the file structure will greatly benefit not only me but also other users who are new to the IHP OpenPDK. Let's find the right path so we can all get our DRCs running like a charm!

Locating and Executing the DRC Script

Next up, I'm having trouble finding the run_drc.py script. The documentation (https://ihp-open-pdk-docs.readthedocs.io/en/latest/verification/drc/04_04_usage.html) suggests that this script should be present in my PDK copy, but I've scoured the directories and haven't been able to locate it. This is a critical issue because the run_drc.py script is likely the main entry point for running DRC from the command line. Without it, I'm limited to using the GUI, which might not be ideal for automation or batch processing. The ability to run DRC from the command line is essential for integrating it into a larger design flow. It allows for scripting and automation, which can significantly speed up the design and verification process. Furthermore, command-line execution is often preferred in continuous integration environments, where automated checks are performed whenever changes are made to the design. The absence of this script raises questions about whether the documentation is outdated or if there's an alternative method for running DRC that I'm not aware of. Understanding how to execute DRC effectively is fundamental to ensuring the reliability and correctness of the design. It's not just about finding a missing file; it's about unlocking a key part of the design workflow. If anyone knows where this script is hiding or if there's a new way to run DRC, please let me know! This is crucial for moving forward with my project.

DRC Menu Missing in KLayout GUI

When I launch the KLayout GUI, I can see all the SG13G2 PDK menu entries, which is a good sign that the PDK is correctly installed. However, I'm missing the crucial DRC entry. This is a major problem because the GUI is often the easiest way to get started with DRC, especially for users who are new to the PDK. Without the DRC menu entry, I have to rely on alternative methods, which might be more complex or less intuitive. The GUI provides a visual interface for configuring and running DRC, making it easier to understand the process and interpret the results. The absence of the DRC menu entry suggests that there might be an issue with the PDK installation or configuration. It could be a simple matter of a missing file or an incorrect setting, but it's also possible that there's a more fundamental problem. Troubleshooting this issue is essential for ensuring that I can use the full functionality of the PDK. The GUI is not just a convenience; it's an integral part of the design workflow. It allows for quick iterations and experimentation, which are crucial for optimizing the design and identifying potential issues early on. Getting the DRC menu entry to appear is a critical step in unlocking the full potential of the IHP OpenPDK. I'm really hoping we can figure out why it's not showing up. It's kind of like having a car but not being able to find the ignition – frustrating!

Running DRC via Macro Development Editor

Digging through the documentation (https://github.com/IHP-GmbH/TO_July2025?tab=readme-ov-file), I stumbled upon a hint that suggests I need to open the macro development editor and run the script from there. This seems to work, which is a relief, but it feels a bit like a workaround. While I'm glad I found a way to run DRC, it raises the question of whether this is the intended method or just a temporary solution. The macro development editor is a powerful tool, but it's not always the most intuitive way to run DRC, especially for complex designs. Ideally, there should be a more straightforward method, either through a dedicated menu entry or a command-line script. The fact that this method works suggests that the DRC functionality is indeed present in the PDK, but it's not being exposed in the way that the documentation describes. This could be a sign of outdated documentation or a change in the PDK's structure. The macro development editor method might be suitable for some users, but it's unlikely to be the preferred approach for everyone. A more accessible and standardized method is crucial for ensuring that the DRC process is user-friendly and efficient. Furthermore, relying solely on the macro development editor might make it harder to integrate DRC into an automated design flow. A command-line interface is often preferred for scripting and batch processing. So, while I'm happy to have found a solution, I'm still keen to understand if there's a more conventional way to run DRC. Is this the new normal, or is there a better way? I'm all ears!

Automating Fill Scripts for DRC Error Fixes

Finally, after running the DRC, I've noticed that I need to run the Fill Activ, Fill Metal, and Fill Top Metal scripts to fix some of the errors. This is a common step in the design process, as these fill scripts help to ensure that the layout meets the manufacturing requirements. However, having to run these scripts manually every time is a bit tedious and time-consuming. It would be fantastic if there was a way to automate this process. Automation is key to improving efficiency and reducing the risk of errors. If the fill scripts could be run automatically after DRC, it would save a significant amount of time and effort. This would also make the design flow more streamlined and less prone to human error. The ability to automate these scripts is not just a matter of convenience; it's a matter of good design practice. It allows designers to focus on the more creative aspects of the design process, rather than getting bogged down in repetitive tasks. Furthermore, automation makes it easier to ensure that the design consistently meets the required specifications. This is especially important in complex designs where there are many different rules and constraints. The question is, is there a way to script or automate these fill scripts? I'm hoping there's a hidden gem in the PDK that I haven't discovered yet. Maybe a command-line option or a configuration setting that can make this happen? Any insights on this would be greatly appreciated! It would be like finding the self-cleaning button on your oven – a total game-changer!

I'm really hoping we can get to the bottom of these questions together. It would be a huge help in making the IHP OpenPDK more accessible and easier to use for everyone. Thanks in advance for your help, guys! Let's make this PDK sing!