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Journal of Computer Networks and Communications
Volume 2014 (2014), Article ID 890354, 7 pages
Research Article

Implementation of Special Function Unit for Vertex Shader Processor Using Hybrid Number System

VLSI Division, School of Electronics Engineering, VIT University, Vellore 632014, India

Received 28 May 2014; Revised 19 September 2014; Accepted 25 September 2014; Published 15 October 2014

Academic Editor: Lixin Gao

Copyright © 2014 Avni Agarwal et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The world of 3D graphic computing has undergone a revolution in the recent past, making devices more computationally intensive, providing high-end imaging to the user. The OpenGL ES Standard documents the requirements of graphic processing unit. A prime feature of this standard is a special function unit (SFU), which performs all the required mathematical computations on the vertex information corresponding to the image. This paper presents a low-cost, high-performance SFU architecture with improved speed and reduced area. Hybrid number system is employed here in order to reduce the complexity of operations by suitably switching between logarithmic number system (LNS) and binary number system (BNS). In this work, reduction of area and a higher operating frequency are achieved with almost the same power consumption as that of the existing implementations.