The industry is merging two different Wireless Personal Area Networks (WPAN) technologies: Bluetooth (BT) and WiMedia Ultra Wide Band (UWB), into a single BT over UWB (BToUWB) specification. The goal is to provide low cost, low power and a wide range of data rate wireless communications for multimedia and mobile applications. The complexity to study such a system requires the development of a virtual prototype at a highlevel of abstraction. The model needs a fast simulation time in order to explore the algorithms necessary for the merging of the standards. Moreover, as the merging is still in a standardization phase, this virtual prototype helps to actively participate to this effort. The aim of this paper is to provide an overview of the methodology used to create a virtual prototype of a BToUWB device.