On high-performance parallel decimal fixed-point multiplier designs

On high-performance parallel decimal fixed-point multiplier designs
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高性能并行十进制定点乘法器设计

DOI:
10.1016/j.compeleceng.2014.08.013
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发表时间:
2014-10
期刊:
Computers & Electrical Engineering
影响因子:
--
通讯作者:
陈添丁
陈添丁
中科院分区:
其他
文献类型:
--
作者:
陈添丁

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十进制乘法的高性能、面积和功率高效的硬件实现是优选的,以减缓各种关键科学和金融应用中的软件模拟,其中由将十进制数转换成其近似二进制表示所引起的误差是不可接受的。本文提出了一种基于8421-BCD的定点十进制乘法并行结构。本质上,它应用混合8421-5421重新编码方案来生成部分乘积,并将它们与组织为树结构的8421超前进位加法器累加。此外,我们提出了一个基于4221-BCD的十进制乘法器,它是建立在一个新的4221-BCD全加器,这个4221乘法器的操作数直接表示在4221 BCD。将所提出的16 × 16十进制乘法器与其他采用TSMC 90 nm工艺的知名十进制乘法器设计进行了比较,评估结果表明,所提出的8421-5421乘法器在所有现有的基于硬件的BCD乘法器中实现了最低的延迟和面积,以及最高的功率效率。
High-performance, area and power efficient hardware implementation of decimal multiplication is preferred to slow software simulations in various key scientific and financial applications, where errors caused by converting decimal numbers into their approximate binary representations are unacceptable. This paper presents a parallel architecture for fixed-point 8421-BCD-based decimal multiplication. In essence, it applies a hybrid 8421–5421 recoding scheme to generate partial products, and accumulates them with 8421 carry-lookahead adders organized as a tree structure. In addition, we propose a 4221-BCD-based decimal multiplier that is built upon a novel 4221-BCD full adder; operands of this 4221 multiplier are directly represented in the 4221 BCD. The proposed 16 × 16 decimal multipliers are compared with other best-known decimal multiplier designs with a TSMC 90-nm technology, and the evaluation results show that the proposed 8421–5421 multiplier achieves the lowest delay and area, as well as the highest power efficiency, among all the existing hardware-based BCD multipliers.
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