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Design of Content-Addressable Memory in Quantum-Dot Cellular Automata | ||
| پدافند الکترونیکی و سایبری | ||
| Article 5, Volume 8, Issue 4 - Serial Number 32, January 2021, Pages 53-61 PDF (952.12 K) | ||
| Document Type: Original Article | ||
| Authors | ||
| S. Rasouli Heikalabad* 1; F. Salimzadeh2 | ||
| 1Department of Computer Engineering, Tabriz Branch, Islamic Azad University, Tabriz, Iran | ||
| 2Department of Computer Engineering, Urmia Branch, Islamic Azad University, Urmia, Iran | ||
| Receive Date: 05 October 2019, Revise Date: 23 December 2019, Accept Date: 01 February 2020 | ||
| Abstract | ||
| Quantum-dot cellular automata (QCA) is one of the new technologies in the design of digital nano circuits. This technology is an appropriate alternative to today's silicon technology. The inherent features of this technology include very small dimensions, high speed and very low power consumption. Therefore, it can be used to design special memories that require high operating speed such as the content addressable memory. These types of memory are widely used in designing hardware systems, especially routers. In this type of memory, speedy operations are very necessary due to the large number of search and comparison errands. In this paper, we propose a structure for the content addressable memory in QCA that has a mask capability for comparison. The proposed structure consists of a memory cell, a comparator and a matching unit designed using Multiplexer and XNOR gate. The performance of the designed structure is studied by QCADesigner software. The result proves its effectiveness. The proposed structure has 11% improvement in cell number, 57% improvement in gate number and 5% improvement in area occupancy compared to the previous structure. | ||
| Keywords | ||
| Content Addressable Memory; Comparator; Nanotechnology; Quantum-dot Cellular Automata (QCA) | ||
| References | ||
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