JZUS - Journal of Zhejiang University SCIENCE

Frontiers of Information Technology & Electronic Engineering 2017 Vol.18 No.11 P.1784-1794

A highly efficient reconfigurable rotation unit based on an inverse butterfly network

Author(s): Chao Ma, Zi-bin Dai, Wei Li, Hai-juan Zang
Affiliation(s): Department of Electrical Engineering, Zhengzhou Institute of Information Science and Technology, Zhengzhou 450004, China; more
Corresponding email(s): wenlu_ma@163.com, Daizb2004@126.com
Key Words: Rotation operations, Self-routing, Control-bit generation algorithm, Inverse butterfly network

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Abstract: We propose a reconfigurable control-bit generation algorithm for rotation and sub-word rotation operations. The algorithm uses a self-routing characteristic to configure an inverse butterfly network. In addition to being highly parallelized and inexpensive, the algorithm integrates the rotation-shift, bi-directional rotation-shift, and sub-word rotation-shift operations. To our best knowledge, this is the first scheme to accommodate a variety of rotation operations into the same architecture. We have developed the highly efficient reconfigurable rotation unit (HERRU) and synthesized it into the Semiconductor Manufacturing International Corporation (SMIC)’s 65-nm process. The results show that the overall efficiency (relative area×relative latency) of our HERRU is higher by at least 23% than that of other designs with similar functions. When executing the bi-directional rotation operations alone, HERRU occupies a significantly smaller area with a lower latency than previously proposed designs.

基于Inverse Butterlfy网络的高效可重构循环移位单元

概要：本文提出了一种利用inverse butterfly网络的自路由特性完成循环移位、短字循环移位等操作的可重构控制信息生成算法。该算法具有高并行度和低成本，此外还支持循环移位、双向循环移位以及短字循环移位操作。据我们所知，这是首个将多种不同类型的循环移位操作统一在一个硬件架构中的算法。本文进一步设计了一种高效可重构循环移位单元，并在SMIC 65-nm工艺下实现了逻辑综合。结果表明：与以往具有相似功能的设计相比，该单元的效能至少提升了23%；当仅支持双向循环移位操作时，该单元具有更小的面积和更低的延迟。

关键词：循环移位操作；自路由；控制信息生成算法；Inverse butterfly网络

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