In advanced nodes (7nm, 5nm), the metal stack is dense and complex. By assigning heights to Metal 1 through Metal 6, an engineer can instantly visualize the "bridge" structures and via alignments. It is excellent for checking if a guard ring structure is properly enclosing the desired vertical volume.
KLayout must be compiled with OpenGL support, which is standard in most modern binary distributions.
The is not a gimmick; it is a pragmatic debugging scalpel. While you will never replace the precision of DRC/LVS with a 3D visual, the human brain is wired to spot spatial anomalies instantly.
The 2.5D view is a versatile feature that transforms KLayout from a 2D editor into a powerful visualization tool. By understanding its underlying script-driven nature and practical applications, you can gain invaluable insights into your chip's vertical structure and streamline your design verification workflow. klayout 25d view
Once installed, a new menu option will appear under > 2.5D View . Configuring the Layer Stack (The .lyp or Script Setup)
KLayout is a popular, open-source, and powerful tool for viewing and editing layout files, particularly in the semiconductor industry. The 25D view in KLayout refers to a specific way of visualizing 3D structures from 2D layout data, offering insights into the third dimension (height or depth) through the use of color and layer stacking. This guide aims to cover the basics and advanced features of using KLayout for 2.5D (or 25D) viewing:
The in KLayout is a semi-3D visualization tool that extrudes 2D layout polygons into vertical layers with defined thicknesses. To use it, you must run a script—often a variant of a DRC script —to define the material stack and z-levels. The Architect of Silicon In advanced nodes (7nm, 5nm), the metal stack
Unlike a full 3D engine that might require complex solid modeling, the 2.5D view works by "extruding" your 2D shapes based on defined height and elevation parameters. Flat polygons (X and Y coordinates).
Search for 25d-view or look for the 2.5D visualization plugin in the repository list.
: Use the Z-axis zoom slider (on the right) to exaggerate height variations, which is helpful if the real height profile is too flat to see clearly. Visual Customization KLayout must be compiled with OpenGL support, which
By mastering the z and zz functions and learning to integrate them with DRC operations, you can quickly transform any layout into a powerful 3D visualization that enhances design verification, failure analysis, and team communication. If you found this guide helpful, consider checking out the official KLayout documentation for even more advanced scripting techniques.
In the world of semiconductor design, visualization is just as critical as routing. For decades, chip designers have relied on flat, top-down 2D views to inspect masks and layers. However, as process nodes shrink (28nm, 16nm, 5nm) and vertical stacking (3D-ICs, FinFETs) becomes standard, the traditional planar view often falls short.
| Issue | Most Likely Cause | Possible Solution | | :--- | :--- | :--- | | No "2.5d View" option in Tools menu | KLayout was compiled without OpenGL support. | Install the official pre-built binary from klayout.org. | | Graphics errors or performance warnings | Outdated or unsupported graphics drivers. | Update your graphics card drivers. | | The 2.5D view is extremely slow or crashes. | The scene contains far more than 100k polygons. | Select a smaller area or a single cell to view. | | The script runs, but no 3D model appears. | The 2D window has no layout loaded. | Ensure a layout is open and visible in the main window. |
: To generate the view, you must use a specialized script—a variant of a Design Rule Check (DRC) script—that defines how each layer is extruded and positioned on the z-axis. How to Use the 2.5d View