可变长移位逻辑的设计与实现

主要研究可变长移位逻辑的几种设计方法。为克服传统的采用移位寄存器来实现可变长移位功能消耗大量寄存器和组合逻辑资源的缺点,结合Xilinx FPGA的结构,提出了基于Xil-inx FPGA的实现方法;针对ASIC设计,提出了两种基于存储器的实现方法,并对它们的优缺点进行了分析和比较,同时给出了原理图和仿真波形。

Design and Implementation of Variable Shift Logic

Several methods to implementation variable shift logic is studied in this paper.The traditional methods to achive this function is based on shift register,and will consume a lot of registers and combinational logic.In order to overcome these disadvantages,based on the characteristic of Virtex-SX device,a method based on FPGA was proposed,aimed at ASIC design,two methods based on memory were proposed.Their shortcoming and strongpoint was analyzed,the simulating waveform is also present.