2022-03-31 00:05:50 -07:00
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snarl README
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============
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2022-03-27 23:44:46 -07:00
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Layout connectivity checker.
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2022-03-31 00:05:50 -07:00
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`snarl` is a python package for checking electrical connectivity in multi-layer layouts.
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It is intended to be "poor-man's LVS" (layout-versus-schematic), for when poverty
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has deprived the man of both a schematic and a better connectivity tool.
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- [Source repository](https://mpxd.net/code/jan/snarl)
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- [PyPI](https://pypi.org/project/snarl)
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## Installation
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Requirements:
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* python >= 3.9 (written and tested with 3.10)
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* numpy
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* pyclipper
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Install with pip:
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```bash
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pip3 install snarl
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```
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Alternatively, install from git
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```bash
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pip3 install git+https://mpxd.net/code/jan/snarl.git@release
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## Example
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See `examples/check.py`. Note that the example uses `masque` to load data.
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```python3
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from pprint import pformat
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from masque.file import gdsii, oasis
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import snarl
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import snarl.interfaces.masque
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# Layer definitions
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connectivity = {
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((1, 0), (1, 2), (2, 0)), #M1 to M2 (via V12)
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((1, 0), (1, 3), (3, 0)), #M1 to M3 (via V13)
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((2, 0), (2, 3), (3, 0)), #M2 to M3 (via V23)
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}
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cells, props = oasis.readfile('connectivity.oas')
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topcell = cells['top']
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polys, labels = snarl.interfaces.masque.read_cell(topcell, connectivity)
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nets_info = snarl.trace_connectivity(polys, labels, connectivity)
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print('\nFinal nets:')
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print([kk for kk in nets_info.nets if isinstance(kk.name, str)])
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print('\nShorted net sets:')
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for short in nets_info.get_shorted_nets():
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print('(' + ','.join([repr(nn) for nn in sorted(list(short))]) + ')')
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print('\nOpen nets:')
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print(pformat(dict(nets_info.get_open_nets())))
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```
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this prints the following:
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```
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Nets ['SignalD', 'SignalI'] are shorted on layer (1, 0) in poly:
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[[13000.0, -3000.0],
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[16000.0, -3000.0],
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[16000.0, -1000.0],
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[13000.0, -1000.0],
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[13000.0, 2000.0],
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[12000.0, 2000.0],
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[12000.0, -1000.0],
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[11000.0, -1000.0],
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[11000.0, -3000.0],
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[12000.0, -3000.0],
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[12000.0, -8000.0],
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[13000.0, -8000.0]]
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Nets ['SignalK', 'SignalK'] are shorted on layer (1, 0) in poly:
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[[18500.0, -8500.0], [28200.0, -8500.0], [28200.0, 1000.0], [18500.0, 1000.0]]
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Nets ['SignalC', 'SignalC'] are shorted on layer (1, 0) in poly:
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[[10200.0, 0.0], [-1100.0, 0.0], [-1100.0, -1000.0], [10200.0, -1000.0]]
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Nets ['SignalG', 'SignalH'] are shorted on layer (1, 0) in poly:
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[[10100.0, -2000.0], [5100.0, -2000.0], [5100.0, -3000.0], [10100.0, -3000.0]]
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Final nets:
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[SignalA, SignalC__0, SignalE, SignalG, SignalK__0, SignalK__2, SignalL]
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Shorted net sets:
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(SignalC__0,SignalC__1,SignalD,SignalI)
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(SignalK__0,SignalK__1)
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(SignalG,SignalH)
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(SignalA,SignalB)
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(SignalE,SignalF)
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Open nets:
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{'SignalK': [SignalK__0, SignalK__2]}
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```
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## Code organization
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The main functionality is in `trace_connectivity`.
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Useful classes, namely `NetsInfo` and `NetName`, are in `snarl.tracker`.
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`snarl.interfaces` contains helper code for interfacing with other packages.
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