A novel nbit arithmetic logic unit design based on. Arithmetic logical unit is the very important subsystem in the digital system design. Design of reversible arithmetic logic unit with builtin testability. Department of computer engineering, shahrerey branch, islamic azad university, tehran, iran 3. Assembly language programming description of instruction set arithmetic and logic the basic operations are implemented in hardware level. An alu is an arithmetic logic unit multiple functions. A new design of an nbit reversible arithmetic logic unit subhankar pal, chetan vudadha, sai phaneendra p. The control unit causes the cpu to do what the program says to do. Macroscopic issues time to market design complexity millions of gates high levels of abstraction design for test reuse and ip portability.
Optimization approaches for designing quantum reversible. Arithmetic logic unit an arithmetic logic unit alu is a digital electronic circuit that performs arithmetic and bitwise logical operations on integer binary numbers. The development in the field of nanometer technology leads to minimize the power consumption of logic. By using reversible logic gates instead of using traditional. A new design of an nbit reversible arithmetic logic unit. The integration can be done b y using the multiplexer. Computer architects do their magic with multiplexers. Reverseengineering the surprisingly advanced alu of the. An arithmetic logic unit design based on reversible logic. The alu will accept two data inputs x and y, and a selection code s. It is a combinational logic unit that performs its arithmetic and logic operations.
International transaction of electrical and computer engineers system, 25, 144148. Pdf design and implementation of a reversible logic. The sophisticated design of a reversible arithmetic logic unit reversible alu for quantum. Proposed circuits have been simulated using modelsim and implemented using. In a computer, the arithmetic logic unit alu is the fundamental.
Introduction to computer architecture reading assignment. A novel approach to design 2bit binary arithmetic logic. Arithmetic logic unit alu design presentation f cse 675. In the proposed design 1, peres full adder gate pfag is used in reversible alu design and hng gate is used as an adder logic circuit in the proposed alu design 2. Alus of various bitwidths are frequently required in very largescale integrated circuits. Optimized designs of reversible arithmetic logic unit. The design o f arithmetic unit and logical unit should be integrated together in order to form a co mplete design. Reversible logic is a technique popularly used to design the computing systems to achive them.
The alu performs the arithmetic and logic operations. Optimized reversible arithmetic logic units springerlink. In this study, three efficient approaches are presented and their implementations in the design of reversible alus are demonstrated. Design of arithmetic logic unit arithmetic and logic unit alu is a data processing unit which is an important part of cpu. A large part of alu design is captured by the design of a 1bit alu. Abstractreversible logic is one of the emerging technologies having promising applications in quantum computing. Introduction to computer architecture slides by gojko babic g. Ece 547 university of maine 1 8bit arithmetic logic unit. Design analysis and simulation of 1 bit arithmetic logic.
This assessment, consisting of an interactive quiz and a printable worksheet, will evaluate your knowledge of the design and function of alus. Computer organization and architecture logic design dr. The first condition for any deterministic device to be reversible is that its input and output be uniquely retrievable. A design of fault tolerant reversible arithmetic logic unit parisa safari 1, majid haghparast 2, asgar azari 3 1. Abstract reversible logic is emerging as an important research area in the recent years due to. It has wide applications in advanced computing, low power cmos. Unless otherwise stated, you can assume that the inputs a and b are signed, twos complement numbers when. Kirkedal thomsen et al 4 also gave an alu design by generalizing the vshape design which can achieve five basic arithmeticlogical operations on two. Here we have proposed a novel design approach for a 2bit binary arithmetic logic unit alu using optimized 8. July 2, 2003 arithmeticlogic units 19 combining the arithmetic and logic units we can combine our arithmetic and logic units into a single arithmeticlogic unit, or alu.
Design and implementation of 4bit arithmetic and logic. By using suitable control logic to one of the input variables of parallel adder, various arithmetic operations can be realized. We have studied in class the functionalities of the corresponding bitwise operators. Motorola data arithmetic logic unit 33 all the data alu operations are performed in two clock cycles in pipeline fashion so that a new instruction can be initiated. Power efficient arithmetic logic unit design using. One operand for the alu is always contained in a register. Alu can implement in many different ways like reversible, irreversible, pass. Keywords reversible logic, arithmetic logic unit, low power design general terms. High functionality reversible arithmetic logic unit thakral. Design and synthesis of reversible arithmetic and logic. Design of integrated reversible faulttolerant arithmetic and logic unit.
A new design of a reversible arithmetic logic unit reversible alu for quantum arithmetic has been proposed in this article. A design of fault tolerant reversible arithmetic logic. Alus are at the heart of all computers as well as most digital hardware systems. We used the 74s181 1 4bit alu design, which was manufactured by texas instruments, as the base of the 8bit design. Pdf optimized reversible arithmetic logic units researchgate. A computers arithmeticlogic unit alu is the heart of the processor, performing arithmetic and logic operations on data.
Design of an efficient low power 4bit arithmatic logic unit alu using vhdl. Arithmetic and logic unit alu philadelphia university. Lecture 4 arithmeticlogic unit university of pittsburgh. Project overview the ece 547 vlsi design project described in this paper is an 8bit arithmetic logic unit alu. Since the demand for more compact system designs with. Arithmetic and logic unit alu is a fundamental component of all processors and designing it with reversible logic is tedious. A 32 32bit 32 result arithmetic logic unit alu alu. The arithmetic logic unit alu is one of the main components of any central processing unit. Design of 8bit arithmetic processor unit based on reversible logic. Design a 4bit alu that implements the following set of operations with only the following components assume 2s complement number representation, no need to implement. Arithmetic logic unit alu as one of the main parts of any computing. This is in contrast to a floatingpoint unit fpu, which operates on floating point numbers. Alu comprises the combinational logic that implements logic operations such as and and or, and arithmetic. The proposed gate has been used in a systematic manner to implement single layer arithmetic logic functions such as reversible full adder rfa, reversible full subtractor rfs and reversible full addersubtractor rfas.
Reversible logic has received great attention in the recent years due to its ability to reduce the power dissipation which is the main requirement in low power digital design. In this paper, reversible arithmetic and logic unit alu is designed to show its major implications on the central processing unit cpu. Design and synthesis of 8 bit reversible arithmetic. Lecture 2 arithmetic logic unit alu and its verilog design. Design and synthesis of reversible arithmetic and logic unit alu. A novel reversible logic gate and its systematic approach.
This paper will deal with the design of a 32 bit reversible arithmetic logic unit alu with 16 operations is presented by making use of double peres gate. In this paper, two types of reversible alu designs are proposed and verified using altera quartus ii software. Reversible logic fundamentals reversible gates basic. Design of the alu adder, logic, and the control unit. Then 1bit alus can be combined to form a multibit alu with a small amount of additional circuitry. If youve studied digital logic, youve probably learned how to combine simple binary adder circuits. Design of integrated reversible faulttolerant arithmetic. Pdf reversible arithmetic logic unit for quantum arithmetic. Read each tutorial step carefully and complete the activities listed in each step.
This complement circuit using reversible logic can be used to design other low loss arithmetic circuit. Design and implementation of a reversible logic based 8bit arithmetic and logic unit article pdf available in international journal of computers and applications 362. Design and implementation of arithmetic and logic unit. The use of reversible alu in a computing system can offer higher power optimization. In low power circuit design, reversible computing has become one of the most efficient and prominent techniques in recent years. This tutorial will teach you how to build an arithmetic logic unit alu from scratch, using these simple logic gates and other components. With power management becoming a critical component for hardware design developers, reversible logic can provide a viable alternative towards creating low power digital circuits. An arithmetic and logic unit alu is a combinational circuit that performs logical and arithmetic operations on a pair of nbit operands in our case, a7.
Tech assistant professor, aditya college engineering, surampalem. The central processing unit or cpu has got a fundamental building block called as arithmetic logic unit or alu. Reversible arithmetic logic unit ieee conference publication. An arithmetic logic unit alu is an integral part of a computer processor. In our design, the full adders are realized using synthesizable, low quantum cost, low garbage output dperes gates. So this article provides explicit construction of reversible alu effecting basic arithmetic operations.
Pdf design of reversible arithmetic and logic unit alu. Design of reversible arithmetic and logic unit alu using. In this paper, a design constructing the arithmetic logic unit alu based on reversible logic gates as logic components is proposed. A novel design of reversible logic based 1bit and 4bit alu. Both proposed designs are analysed and compared in terms of number of gates count, garbage output. In this paper we propose two new reversible alus using elementary. Arithmetic operations logical operations consider hypothetical alu having 4 arithmetic operations and 4 logical four arithmetic operations. Arithmetic logic unit alu handles integers does the calculations. Using logic for arithmetic suppose you wanted to do addition with logic. In this paper, the design of a reversible arithmetic logic unit alu is presented making use of multiplexer unit as well as control signals. In this paper we propose two new reversible alus using elementary quantum. Design of an efficient low power 4bit arithmatic logic. In this paper, a new high speed and a low power reversible gate called the fgate has been proposed.
Generalization alu arithmetic logic unit a critical component of the microprocessor, the core component of central processing unit. The arithmeticlogic unit alu of a processor performs integer arithmetic and logical operations. Reversible logic has emerged as a promising paradigm in various domains, such as low power vlsi design, quantum cellular automata, and nanotechnologybased systems. Three new designs of reversible onedigit arithmetic logic unit for quantum arithmetic has been presented in this article. Pdf arithmetic logic unit alu as one of the main parts of any computing. A novel 4bit arithmetic logic unit design for power and area optimization mr.
Design of low power arithmetic and logic unit using. In this paper, we proposed three different designs for reversible 1bit alus using. Pdf reversible logic based arithmetic and logic unit. There are various types of cpus are available but every cpu contains an alu. Muduli, giridhari, bibhudatt pradhan, manas ranjan jena, and snigdharani nath. This communication presents the complete design of a reversible arithmetic logic unit alu that can be part of a programmable reversible computing device such as a quantum computer. Online testable reversible logic circuit design using nand blocks. For example, one of its operations is to add two 32bit integers. Pdf optimized designs of reversible arithmetic logic unit. An integer used as input to an operation is called an operand.
As we known, alu is an important part of central processing unit cpu as the execution unit. A novel nbit arithmetic logic unit design based on reversible logic virender singh electronic science department, kurukshetra university kurukshetra ruchi gupta electronic science department, kurukshetra university kurukshetra abstract in this paper, the design of an nbit reversible arithmetic logic unit alu is presented. Young researchers club, ahar branch, islamic azad university, ahar, iran 2. Sanjay tembhurne2 department of electronics and communication engineering ghraet, nagpur, maharashtra, india abstractin the modern era, power dissipation and area of the circuit under fabrication has become a major and vital. This lecture will finish our look at the cpu and alu of the computer. The logic symbol, qca layout, and its simulation results are shown in fig. Efficient design of arithmetic logic unit using reversible logic gates.
A novel 4bit arithmetic logic unit design for power. In this paper, a novel reversible arithmetic and logic unit is proposed, where a single module performs both arithmetic and logical operations. Design of an efficient low power 4bit arithmatic logic unit alu. Design a 4bit alu that implements the following set of.
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