DESIGN OF A NOVEL 8-BIT BARREL SHIFTER FOR COMBINED SHIFT AND ROTATE OPERATIONS

Abstract

In this paper, a novel 8-bit barrel shifter is designed using both standard logic gates and transmission gates. The novelty of our design supports left shift, right shift, left rotate, and right rotate operations within a single structure, enabling versatile directional control through data reversal techniques that allow streamline control flow and reduce logic complexity. Without limiting functionality to one operation per cycle, this shifter achieves all four operations compactly, optimizing resource use and operational flexibility. The design is implemented and validated at 45 nm and 180 nm CMOS technology nodes, with waveform analysis confirming reliable performance across all conditions. Simulation results indicate that the transmission gate-based configuration significantly improves power efficiency with minimum power dissipation of 98.67 nW achieving up to 99.4% reduction compared to reversible logic-based counterparts, making it ideal for power-sensitive applications. This barrel shifter advances conventional designs, delivering a flexible and power-optimized solution suitable for modern digital environments.