In this paper a Globally Asynchronous Locally Synchronous (GALS) implementation of a complex digital system is discussed. The deployed asynchronous wrappers are based on a novel request-driven technique with embedded time-out function. Each GALS block is fitted with a local clock generator for flushing the internal pipeline stages when there are no incoming requests. This request-driven technique is applied for the ‘GALSification’ of an IEEE 802.11a compliant baseband processor. Details of the GALS partitioning and some additionally developed blocks will be discussed. Furthermore, the design-flow, implementation results and power estimation numbers are reported.