snarled 1.0

Description:

snarled 1.0

snarled README
Layout connectivity checker.
snarled is a python package for checking electrical connectivity in multi-layer layouts.
It is intended to be "poor-man's LVS" (layout-versus-schematic), for when poverty
has deprived the man of both a schematic and a better connectivity tool.

Source repository
PyPI

Installation
Requirements:

python >= 3.10 (written and tested with 3.11)
numpy
klayout (python package only)

Install with pip:
pip install snarled

Alternatively, install from git
pip install git+https://mpxd.net/code/jan/snarled.git@release

Example
See examples/check.py (python interface) or examples/run.sh (command-line interface).
Command line:
snarled connectivity.oas connectivity.txt -m layermap.txt

Python interface:
from pprint import pformat
import logging

import snarled
from snarled.types import layer_t


logging.basicConfig()
logging.getLogger('snarled').setLevel(logging.INFO)


connectivity = [
((1, 0), (1, 2), (2, 0)), # M1 to M2 (via V12)
((1, 0), (1, 3), (3, 0)), # M1 to M3 (via V13)
((2, 0), (2, 3), (3, 0)), # M2 to M3 (via V23)
]

labels_map: dict[layer_t, layer_t] = {
(1, 0): (1, 0),
(2, 0): (2, 0),
(3, 0): (3, 0),
}

filename = 'connectivity.oas'

nets = snarled.trace_layout(filename, connectivity, topcell='top', labels_map=labels_map)
result = snarled.TraceAnalysis(nets)

print('\n')
print(result)

this prints the following:
INFO:snarled.trace:Adding layer (3, 0)
INFO:snarled.trace:Adding layer (2, 3)
INFO:snarled.trace:Adding layer (1, 3)
INFO:snarled.trace:Adding layer (1, 2)
INFO:snarled.trace:Adding layer (1, 0)
INFO:snarled.trace:Adding layer (2, 0)


Trace analysis
=============
Nets
(groups of electrically connected labels)
SignalA,SignalB
SignalC,SignalD,SignalI
SignalE,SignalF
SignalG,SignalH
SignalK
SignalK
SignalL

Opens
(2+ nets containing the same name)
SignalK : 2 nets

Shorts
(2+ unique names for the same net)
SignalA,SignalB
SignalC,SignalD,SignalI
SignalE,SignalF
SignalG,SignalH
=============

Code organization

The primary functionality is in trace; specifically trace.trace_layout().
main provides a command-line interface, supported by the functions in utils.