Tech Setup

The following files needs to be prepared in order to set up laygo2 for a new technology:

• __init__.py: Package definition file.

• laygo2_tech_templates.py: Code for template definitions.

• laygo2_tech_grids.py: Code for grid definitions.

• laygo2_tech.yaml: Technology parameters used by _template.py, _grid.py files.

• laygo2_tech.layermap: (optional) Layer information defined by technology-speckfic PDK.

• laygo2_tech.lyp: (optional) Layer display information for KLayout.

A simple technology setup example for laygo2 is available here.

Please find detailed descriptions for the listed files below:

__init__.py

Contains import statements for technlogy-specific functions such as load_templates() and load_grids().

laygo2_tech_templates.py

This file implements technology-specific templates and their associated functions. It also contains the load_template() function which returns a TemplateLibrary object that holds template objects (such as MOSFETs, capacitors, and resistors) of core devices.

The templates are typically created using predefined template classes such as NativeInstanceTemplate(for vanilla instances), ParameterizedInstanceTemplate(for PCell instances), or UserDefinedTemplate(for user-defined virtual instances), or users can define their own template classes.

laygo2_tech_grids.py

This file implements the technology-specific placement and routing grids along with their functions. The load_grid() function, in this file, returns a GridLibrary object which contains grid objects.

laygo2_tech.yaml

This yaml file contains technology-specific parameters required for template and grid generation (such as unit resolution, pin location, structure size, and grid parameters). This file serves as a central repository for all technology-related information for template and grid generation functions in the laygo2_tech_template.py and laygo2_tech_grid.py files. Instead of using this yaml file, users can also hard-code the required the numeric parameters.

laygo2_tech.layermap

Contains layer mapping information for the target technology. The layer information is used for layout generation, gds export, and skill export.

The layermap file is normally provided by the technology ventor. If the layermap file is created manually by users, please use the following format to define layer parameters.

layername layerpurpose stream_layer_number datatype

(please find the example layermap file in the laygo2_tech directiory for reference).