Frequently asked questions (FAQ)¶
For contact information, frequently asked questions and further documentation, please visit our website.
Characterization of analog circuits¶
For measurements of analog circuits see [Bruederle2009PhD]. Note that version 3 of the Spikey chip was used in this thesis.
NEST model of hardware STDP synapses¶
In the scope of [Pfeil2012STDP] we implemented an STDP synapse in NEST considering the following features of STDP synapses on the Spikey chip:
Local measurement and accumulation of correlations between pre- and postsynaptic spikes.
Global mechanism that sequentially evaluates these accumulated correlations and updates the synaptic weight.
Discretization of synaptic weights with a 4-bit resolution (16 values).
Reduced symmetric nearest-neighbor spike pairing scheme (see [Morrison2008]).
Please not that parameter variations (fixed-pattern noise) are not considered, but can be implemented by distributing the thresholds for the evaluation of the charge on the capacitors.
List of publications¶
Brüderle, D. (2009). Neuroscientific Modeling with a Mixed-Signal VLSI Hardware System. PhD thesis, Heidelberg University. HD-KIP 09-30.