The ubichip is a bio-inspired reconfigurable circuit developed in the framework of the european project Perplexus. The ubichip offers special reconfigurability capabilities as self-replication and dynamic routing. This paper describes how to exploit the dynamic routing capabilities of the ubichip in order to implement plastic neural networks. We present an approach for dynamically generating a network topology, where synapses among neurons can be created or destroyed depending on the input stimuli. We describe their implementation in the ubichip, and we analyse the resulting network topology and the network development. This work constitutes a first step toward plastic neural circuits exhibiting more realistic biological features.