支持媒体处理的子字绝对值单元设计与实现

摘要

子字并行结构的计算单元是提高多媒体应用程序性能的有效方式.研究和实现了支持子字并行的32位绝对值单元,并优化了该单元的关键路径.从时序,面积等方面对三种设计方案进行了分析比较.结果表明经过优化的子字并行绝对值单元在保证面积大小的同时,减小了整个单元的延时.%Computing unit using subword - parallel technique can improve the performance of multimedia application efficiently. An optimized subword - parallel absolute difference unit is proposed in this paper comparing to the units have been published. It also provides the analysis of the timing, area of three absolute difference units applying different design methods. The results show that the optimized subword - parallel absolute difference unit not only cuts down the length of the critical path with respect to other units, but also keep the area of the unit in a normal standard.