MULTI-PORT RAM DESIGN IN QCA USING LOGICAL CROSSING

Abstract

Memory and its data communication are very significant in the Processor design and its performance. In order to attain high performance computing machine, the memory access has to be equally faster. Here in this paper, Dual port memory with Set/Reset is designed using Majority Voter in Quantum-dot Cellular Automata (QCA). Dual port memory consists of basic functional blocks such as 2 to 4 decoder, Control Logic Block (CLB), Address Checker Block (ACB), Memory Cell (MC), Data Router block and Input / Output block. These functional units are constructed using the 3-input majority voters. QCA is one of the recent technologies for nano-metric design of digital components. The functional simulation of Dual Port Memory design is verified using QCA. A novel crossover method called Logical Crossing is utilized to improve the area of the proposed design. The logical crossing does the data transmission with the support of proper Clock zone assignment. The logical crossing based QCA layouts are optimized in terms of area and number of cell counts. It is observed that 29.81%, 18.27%, 8.32%, 11.57% and 3.69% are percentage of improvement in number of cells in Decoder, ACB, CLB, Data Router and Memory Cell respectively. Also, 25.71%, 16.83%, 8.62%, 4.74% and 3.73%  of improvement in area for Decoder, ACB, CLB, Data Router and Memory Cell respectively. In addition to that the proposed Dual port memory using logical crossing attains 8.26% of area and 8.65% of number of cells improvement. Moreover, the quantum circuits of the RAM are obtained and quantum cost, constant inputs, number of gates, garbage output and total cost are estimated as 285, 67, 57, 50 and 516 respectively.