支持短向量的32位快速加法器设计
Design of a 32-bit Fast Adder for Short Vectors
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摘要: 研究和设计了一种面向多媒体应用的32位短向量快速加法器,该加法器以SK型并行前缀加法器为基础,通过有效控制进位链,实现了同时执行4个基于字节的加法,或者2个基于半字的加法,或者1个基于字的加法,或者1个基于单精度浮点数的比较运算.综合结果表明,此设计方法同传统的设计方法相比,电路面积接近,时序提高了10%,总体性能较优.Abstract: This paper studies and designs a novel 32-bit short vectors fast adder for multimedia application.The adder, which is based on Sklansky Parallel-Prefix adder,by controlling the carry chain,realizes both of four and two paralleled addition operations,with 8-bit and 16-bit addends respectively.It also supports one addition operation with 32-bit addends, as well as the comparison operation between single-precision floating-point data.Synthesis shows that,compared with traditional design,the overall performance of our novel adder is better,with a circuit area approach and a timing improved by 10 percent.