Issue No. 06 - June (2012 vol. 61)
DOI Bookmark: http://doi.ieeecomputersociety.org/10.1109/TC.2011.97
Julio Villalba Moreno , University of Malaga, Malaga
Tomas Lang , University of California at Irvine, Irvine
Javier Hormigo , University of Malaga, Malaga
In this paper, we present multioperand radix-2 online addition using different data representations (signed-digit, two's complement, and carry-save), in particular cases in which operands with different representations are added. We use the previously defined online full adder (olFA) as a component to build different multioperand online architectures. To merge data with different representations, an inner conversion of data is performed, eliminating any conversion stage and penalty time. We propose a technique to build multioperand trees efficiently and give six practical rules to deal with different kinds of data in the same adder. For addition of a stream of data, we determine the minimum number of separation cycles required to isolate two successive computations and propose a novel hardware technique that eliminates completely the separation cycles, resulting in the maximum throughput possible.
Online addition, multioperand, signed-digit, carry-save.
J. Villalba Moreno, J. Hormigo and T. Lang, "Radix-2 Multioperand and Multiformat Streaming Online Addition," in IEEE Transactions on Computers, vol. 61, no. , pp. 790-803, 2011.