Online fault testing of reversible logic using dual rail coding

Online Fault Detection in Reversible Logic

“…The quantum cost overhead for our approach is only 4.21% in average, compared to 312.28% for the approach in [22], [23], 388.67% for the approach in [26], and 41.40% for the approach in [24], [25]. It is interesting to note that our approach has absolutely no overhead in terms of garbage outputs since the testability feature does not produce any extra garbage.…”

“…Table II summarizes the improvements achieved by our approach. Quantum costs are decreased by 74.72%, 78.68%, and 26.30% in average, compared to ( [22], [23]), [26], and ( [24], [25]), respectively. Reductions of garbage outputs range from 96.89% to 99.84% in average, compared to the previous approaches.…”

“…A number of different approaches to generating online testable reversible circuits exist in the literature including designs in [22], [23], [24], [25], [26]. We briefly describe each of these and discuss the limitations.…”

“…Another approach proposed in [26] uses a set of 4×4 dual rail reversible gates for online fault detection. Each dual rail gate has two pairs of inputs, and two inputs of each pair are given in dual rail form, i.e.…”

“…We then applied our approach to make the circuits online testable. In Table I , we compare the testable circuits generated by our approach to that of previously reported approaches [22], [23], [26], [24], [25] in terms of quantum cost and garbage outputs. Note that QC and GO columns in the table represent the quantum cost and the number of garbage outputs, respectively.…”