CAD layout electrical connectivity checker
Project description
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.
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
; specificallytrace.trace_layout()
. main
provides a command-line interface, supported by the functions inutils
.
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