Technology: gpdk-related process setting

Default process

The technology in gpdk holds a number of common configuration files dealing with process and layout display, such as:

• Process layers definitions: layers.py

• Layers display settings: display.py

• Layout pattern accuracy setting: metrics.py

• Waveguide type definitions: wg.py

• Routing-related settings definition: auto_link.py

• Automatic waveguide type transition: auto_transition.py

• Waveguide corner customization: auto_bend.py

• Metal wiring related settings: auto_via.py, fitting_function.py

Note: The drc subfolder of technology contains the design rule check template based on the current process generated layout, the Calibre^TM DRC rule deck template script.

Customized process

In order to be more convenient for users to use and customize the process information, mainly for layers.py and display.py, technology provides a convenient user-defined file layers.csv file, users can open gpdk > technology > layers.csv file to customize their relevant processes.

First double-click on the file to open the table as shown below:

• LAYER and DATATYPE together determine the number of the layer.

• NAME is used to define the name of the layer.

• DESCRIPTION is the description of the layer.

• PROCESS and PROCESS_DESCRIPTION are used to define and describe the etching process, respectively.

• PURPOSE and PURPOSE_DESCRIPTION are used to define and describe the processing process respectively.

• FILL_COLOR is used to define the color of the filled layer.

• FILL_PATTERN is used to define the graphics of the filled layer, mainly diagonal and back-diagonal.

• STROKE_COLOR is used to define the color of the border of the layer.

All these information are user-defined.

Then after the user has customized the relevant process information, running gpdk > technology > generate_layers_display_from_csv.py directly will generate the generated folder in gpdk > technology, which contains the display.py, layers.csv, layers.lyp, layers.py, and wg.csv files.

Finally, we can use the relevant process setup files generated in the file via gpdk > technology > tech.py . Double-click to open the tech.py file to reveal the following scripts:

from .auto_link import LINKING_POLICY
from .auto_transition import AUTO_TRANSITION
from .auto_vias import AUTO_VIAS
from .bands import BAND
from .device import DEVICE
from .display import DISPLAY
from .fitting_function import FITTING_FUNCTION
from .gdsii import GDSII
from .label import LABEL
from .layers import LAYER, PROCESS, PURPOSE
from .linker import LINKER
from .metal import METAL
from .metrics import METRICS
from .terminal import PIN, PORT
from .vias import VIAS
from .wg import WG
from .resource import RESOURCE

In the module import section we replace the original:

from .display import DISPLAY
from .layers import LAYER, PROCESS, PURPOSE

to:

from .gennerated.display import DISPLAY
from .gennerated.layers import LAYER, PROCESS, PURPOSE

Save it again and then you can use the custom process information.

Waveguide information

In order to be more convenient for users to view the information of the waveguide process in use, technology provides a convenient method to reverse the python source file to generate a csv netlist file, users can open gpdk > technology > wg.py and run it, then the wg.csv file will be generated in the generate folder, you can open the file to quickly view various information related to waveguide.