Synthesis by direct mapping of asynchronous extended burst-mode controllers using RS latch

This paper proposes a new approach for synthesis by direct mapping of extended burst-mode asynchronous finite state machines (XBM_AFSM). The great advantage of the synthesis by direct mapping is the achieved simplicity in methodology, not demanding any knowledge about asynchronous logic concepts, hazard-free circuits and critical race theory. The synthesized XBM_AFSMs operate in mode Ib/Ob, which present superior performance when compared to generalized fundamental mode asynchronous circuits, once shows to be faster than those previously proposed in the literature and keeps a good modularity, provided by the simple interface with the external world. Starting from a well known extended burst-mode (XBM) specification, the direct mapping allows implementing large specifications with just little computational effort. The new approach uses the RS latch as memory element (cell control). A comparison is performed between three different memory elements from literature and the one proposed in this work. Comparing the latency time with the other three cells, it provided reductions from 7% to 22%, while comparing area, it showed to have an intermediate result between the others, being superior to some of them.