Pdf the design of arithmetic logic unit based on alm. Alu control lines define a function to be performed on a and b. Arithmetic logic unit hardware device that performs simple integer operations handles up to two operands has a selector to choose which operation to perform. It represents the fundamental building block of the central processing unit cpu of a computer. Arithmetic logic unit i perform arithmetic operations ii. An arithmeticlogic unit alu is the part of a computer processor cpu that carries out arithmetic and logic operations on the operands in computer instruction words. In some microprocessor architectures, the alu is divided into the arithmetic unit au and the logic unit lu. Apply logical operation to each corresponding pair of bits. This is the part of the computer which performs arithmetic operations on numbers, e. Functions of the arithmetic logic unit alu computer. An arithmetic logic unit alu represents the fundamental building block of the central processing unit of a computer. If the sign bit is not extended, all the shift operators fill the shiftedout bits with zeros.
An arithmetic logic unit alu is a combinational digital electronic circuit that performs. An arithmetic logic unit alu is a digital circuit used to perform arithmetic and logic operations. Arithmeticlogic unit alu performs arithmetic add, subtract performs logic and, or, invert, complement shifts right, left, arithmetic, logical. The heart of every computer is an arithmetic logic unit alu. In addition to alus, modern cpus contain a control unit cu. In some processors, the alu is divided into two units, an arithmetic unit au and a logic unit lu. What is the function of the arithmetic logic unit in a computer. Arithmetic and logic unit alu alu is responsible to perform the operation in the computer. It does all processes related to arithmetic and logic operations that need to be done on instruction words. That part of a cpu that does calculations and logical operations. The arithmetic instructions define the set of operations performed by the processor arithmetic logic unit alu. Arithmetic logic unit definition and meaning collins. Archived from the original pdf on september 23, 2015. Arithmetic logic unit the part of a central processing unit that performs arithmetic and logical operations.
Alu alu full form is arithmetic logic unit, takes the data from memory registers. An arithmeti c lo g ic unit alu is a combinational digital electronic circuit that performs arit hmetic and bitwise operations on integer binary numbers. Alu is having collection of two types of operations. Lecture 4 arithmeticlogic unit university of pittsburgh. The arithmetic instructions are further classified. Some has done this, for example, paul metzgen3 has designed a high performance 32bit.
Arithmetic logic unit definition of arithmetic logic. This is in contrast to a floatin gpoin t unit fpu, which operates on floating point numbers. Consider an alu having 4 arithmetic operations and 4 logical operation. An arithmetic logic unit alu is a major component of the central processing unit of a computer system. These units do basic operations like addition, multiplication and division. A subunit within a computers central processing unit. What is the function of the arithmetic logic unit in a. Pdf an arithmetic logic unit alu is at the heart of a modern. The basic operations are implemented in hardware level. Alu contains the logical circuit to perform mathematical operations like subtraction, addition, multiplication. Develop intelligent approach for migration modeling towards software defined ipv6 sodip6 network. Modern cpus contain very powerful and complex alus.1000 1545 1016 239 1432 404 1133 312 1164 505 776 623 614 1373 44 588 660 1133 249 372 842 1638 576 1636 1019 790 527 60 1138 62 370 1054 1469 501 1036 684