Decimal Multiformat Online Addition

• Published in: IEEE transactions on computers Vol. 65; no. 10; pp. 3203 - 3209
• Main Authors: Garcia-Vega, Carlos, Gonzalez-Navarro, Sonia, Chica, Pedro Balboa-La, Villalba-Moreno, Julio
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-10-2016; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: addition; Computer architecture; decimal; Logic gates; multiformat; Online; Online services; RBCD; Redundancy; redundant; Signal processing algorithms
• ISSN: 0018-9340; 1557-9956
• DOI: 10.1109/TC.2016.2516009

This paper presents and analyzes two different strategies for designing multiformat online decimal adders ( <inline-formula><tex-math notation="LaTeX">\text{olDFA}_{\text{Mformat}}</tex-math> <inline-graphic xlink:type="simple" xlink:href="garciavega-ieq1-2516009.gif"/> </inline-formula>). The first strategy uses a code conversion stage plus an online Decimal Full Adder (olDFA); the second one involves designing specific adders by modifying the architecture of the olDFA. These strategies are applied in the design of specific architectures to deal with financial analysis calculations. We use synthesis results to verify the theoretical aspects of the designs and to analyze the robustness and lacks of the strategies. The guidelines presented in the paper are valuable to designers of online multiformat-based solutions.