Design of a Fault Tolerant Reversible Compact Unidirectional Barrel Shifter

Optimized fault tolerant designs of the reversible barrel shifters using low power MOS transistors

“…1 allows to detect a faulty signal from the circuit's primary output. Researchers showed that if a reversible circuit is drawn using only reversible fault tolerant gates, the entire circuit preserves parity and hence it is able to detect a faulty signal in its primary outputs [5][6][7].…”

“…It has also been pointed out that an irreversible system has a fundamental lower limit to the energy dissipation during a computation which equals to KT ln (2) for each erased bit. Although the power dissipations due to information loss in irreversible circuits are negligible at present, but it will be a significant concern in near future if Moore's Law continues to be in effect [7]. Moore predicted in [8] that "the number of transistors and resistors on a chip doubles in every 18 months".…”

“…Moore predicted in [8] that "the number of transistors and resistors on a chip doubles in every 18 months". This assumption implies that the power dissipation in the circuit must be decreased, otherwise internal overheating can demolish the future hardware chips [5,7]. Therefore, the reversible circuit will play an extensively crucial role in the upcoming days.…”

“…There are few non-fault tolerant reversible designs of barrel shifters in literature [21][22][23]. However, all these approaches are not generalized and scalable except our proposed designs [7]. Thus, the main objective of this research is to develop a generalized structure of the reversible barrel shifters in addition to the fault detection capabilities.…”

“…3. We already published a part of this mentioned work in [7]. This section proposes few extension of the published work such as MOS realization and generalized algorithmic representation.…”