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Speck 2b
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Speck 2b is a specific version of Speck, which integrates a 128 * 128 resolution DVS and 
the chip itself is fully configurable with the spiking neuron capacity of 32 million.

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Key features
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* 1x Event (or DVS) Pre-Processing layer (incl. noise filtering) 
* 9x Convolutional layers (incl. pooling) 
* 1x Readout layer operating in average, max, max average, or threshold mode
* Asynchronous serial interface
* Ultra-low average working power consumption

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DVS Layer
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* 128 x 128 Pixel Array
* Sum pooling 1:1, 1:2, 1:4
* 1 bit conf per pixel (1 kill)
* ROI selection
* Noise filter and hot pixel rejection
* On only / Off only / Both / Merge filtering of DVS event polarity
* Mirroring in both X/Y
* Rotate in 90-degree steps
* Fanout of 2

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CNN Layer
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* Max input dimension 128*128
* Max feature output size 64*64
* Max feature number 1024
* Weight resolution 8 bit
* Neuron state resolution 16
* Max kernel size 16*16
* Stride {1,2,4,8} independent in X/Y
* Padding [0..7] independent in X/Y
* Pooling 1:1, 1:2, 1:4
* Fanout of 2
* Leak operation

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Readout Layer
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* 16 classes
* Selectable moving average between 1, 6 and 32 time steps.
* 4 readout modes: inactive/threshold/max spiking class/specific class.

.. note::
    
    The readout layer inside the Speck 2b chip is not available at the moment


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Api reference:
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* Model: :ref:`samna.speck2b`
* Event: :ref:`samna.speck2b.event`
* Configuration: :ref:`samna.speck2b.configuration`