[aurelian15]

Depends ;-)

First of all, there is no single accepted definition of "neuromorphic" [1]. Still, as a point in favour of the "neuromorphic systems are analogue" crowd: the seminal paper by Carver Mead that (to my knowledge) coined the term "neuromorphics" specifically talks about analogue neuromorphic systems [2].

Right now, there are some research "analogue" (or, more precisely "mixed signal") neuromorphic systems being developed [3, 4]. It is correct however that there are no commercially available analogue systems that I am aware of. Unfortunately, the same can be said for digital neuromorphics as well (Intel Loihi is perhaps the closest to a commercial product, and yes, this is an asynchronous digital neuromorphic system).

[1] https://iopscience.iop.org/article/10.1088/1741-2560/13/5/05...

[2] https://authors.library.caltech.edu/53090/1/00058356.pdf

[3] https://brainscales.kip.uni-heidelberg.de/

[4] https://web.stanford.edu/group/brainsinsilicon/documents/ANe...