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What is LASI ?

LASI (LAyout System for Individuals) is a "general purpose" layout and design system originally intended for integrated circuits. It is versatile enough that it can be used for ICs, MEMS, discrete devices, schematics, PC boards and project documentation drawings. LASI is freeware.

LASI is a traditional Win32 application that should install and run on Windows versions XP, Vista, 7 or 8.1, and Windows 10 if it fully supports Win32 programs. Windows 7 is currently preferred. LASI should also run with some limitations on most Linux systems using the Wine translator.

LASI is NOT intended for commercial use. When submitting actual designs for processing approved commercial software should be used.

LASI is intended for students. It teaches a better understanding of what you are really doing. To use LASI, you need to know something about your technology, the physics involved, have some circuit intuition, and not just know how to run software. It is for people who still consider IC design something of an art.

LASI also runs portably. You can install the system on a flash drive or other removable drive and work on drawings also stored on that same drive. Portable operation lets you do work on any convenient PC without leaving any files on that PC. This is handy for presentations and for student projects.

Drawings are built from hierarchical cells stored as individual TLC (Transportable Layout Cell) files. TLC files can be easily traded between different drawings. TLC files are in basic XML format.

LASI also has a script command language. This is a simple text file of drawing edit commands that can be individually written to create drawing figures, complete cells, or anything that could be difficult to draw by hand.

LASI consists of a main drawing editor and several "utility" programs. These utilities include a user programmable bitmap based DRC, a basic matrix router, and a Spice netlist compiler that extracts Spice circuit files from both schematic and layout.

The utilities also include GDS, CIF and DXF format converters, Since the LASI drawing structure is fairly similar to GDS, drawings can be archived in GDS. Since most other CAD systems can read GDS, drawings can be moved to other CAD systems if desired, or if LASI is not available.

LASI does not do Spice simulations. There are good Spice simulators available already. Spice simulations can be quite customized and are better not integrated into LASI. Most simulators can run directly out of the main editor or the Spice compile utility.

 For anyone who is not familiar with LASI or its utilities there is a large built-in Help file system.

What's New ?


LasiDrc the design rule  checker has been revised to have a more intuitive setup procedure. It should be still be compatible with older DRC files.

Help files have been updated to better explain parameters Distance and Resolution in DRC files.

Some DEC errors were found in the Imager Addon. These are fixed.


Tooltips have been permanently turned off since they often cause unnecessary redraws on some versions of Windows. Pressing F1 and clicking a command button reads a more complete Help item for that button.

Minor internal changes to the main editor and most utility programs.

Addon layouts have been recompiled so that any recent changes will be included.


Tooltips can now be hidden or shown  using the Cnfg  command by checking or unchecking "Hide All Tooltips.". This is applied immediately without having to restart LASI.. Tooltips can cause annoying redraws on some versions of  Windows.

Tooltip timing has been adjusted slightly.

Minor changes to utility programs.

Several changes to Help files and web pages .

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