Shift invert coding (SINV) for low power VLSI

Low power VLSI circuit design is one of the most important issues in present day technology. One of the ways of reducing power in a CMOS circuit is to reduce the number of transitions on the bus and bus invert coding is a widely popular technique for that. In this paper we introduce a new way of coding called the ShiftInv coding that is superior to the bus invert coding technique. Our simulation results show a considerable reduction on the number of transitions over and above that obtained with bus invert coding. Further, the proposed technique requires only 2 extra bits for the low power coding, regardless of the bit-width of the bus and does not assume anything about the nature of the data.