An Implementation of Extended Burst-Mode Specifications as Quasi Delay Insensitive State Machines

Due to the increasing demand for mobile devices, the search for ultra-low-power projects is becoming a priority. One technique that allows a strong reduction of circuits dissipated power is the sub-threshold voltage operation, but it leads to some drawbacks. The QDI (Quasi Delay Insensitive) asynchronous circuits class shows to be an interesting solution to these problems, when compared to synchronous circuits and in CMOS-UDSM (Ultra Deep Sub-Micron) technology. Asynchronous finite state machines (AFSMs) are important components in a QDI asynchronous system. This paper proposes a new architecture and a synthesis method for QDI AFSMs described in Extended Burst-Mode (XBM) specification. The architecture and synthesis method are presented through case study. The QDI_XBM_AFSM proposed presents for four benchmarks an average reduction of 17.7%, 29.2% and 37.8%, respectively, latency time, dynamic power and static, when compared with five QDI AFSMs of the literature.