Configurable memory designs in quantum-dot cellular automata

Quantum-dot cellular automata (QCA) has the capability to scale down beyond the range of CMOS. Besides wide acceptance of QCA, it suffers from different challenges, regular structure and configurability is one of them. The disparate design in QCA increases design complexity as well as cost. The disparity of design needs different clocking layout for the correct propagation of signals. Moreover, the interconnection of these non-symmetric designs also increases the routing difficulty in a specific, realistic clocking scheme. In this paper, configurable memory structures are investigated in QCA. First of all, a configurable level triggered flip flop (ConFF) is realized. The same ConFF is utilized to design configurable dual edge triggered flip-flop (EConFF) with some minor modification. Nine different logic functions can be produced using the same EConFF circuit which is not found in any existing QCA circuit.The proposed configurable structures are verified with QCADesigner 2.0.3. © 2021, Bharati Vidyapeeth's Institute of Computer Applications and Management.