# Control unit and arithmetic logic unit pdf

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Arithmetic Logic Unit is the part of a computer that performs arithmetic operations on binary numbers. The inputs to an ALU are the data where we have to perform operations. They are called operands.

## Arithmetic & Logic Unit ( ALU ) Design using Reversible Control Unit

Show all documents These two operations are depends upon the number of selection lines to select a particularoperation in the unit. Mainly ALU contains two inputs which are control by the select line for the multi- operation. ALU defines for the two most important units and they are arithmetic and logic units. In this paper, the arithmetic unit defines for the bit adder, bit subtractor and bit comparator where in the logic units we define all the gates of bit. Arithmetic Unit.

The basis of comparison include: Description, dependency, function and design. It performs all processes related to arithmetic and logic operations that need to be done on instruction words. In some processors, the arithmetic logical unit is divided into two units, an arithmetic unit AU and a logic unit LU. The ALU is typically designed in such a way that it has a direct input and output access to the processor main memory —the random access memory RAM. Now, the input and outputs flow along an electronic path that is known as a bus. The input consists of an instruction word that contains an operation code or sometimes a format code.

## 5 Difference Between Arithmetic Logical Unit (ALU) And Control Unit (CU)

In computing , an arithmetic logic unit ALU is a combinational digital circuit that performs arithmetic and bitwise operations on integer binary numbers. It is a fundamental building block of many types of computing circuits, including the central processing unit CPU of computers, FPUs, and graphics processing units GPUs. The inputs to an ALU are the data to be operated on, called operands , and a code indicating the operation to be performed; the ALU's output is the result of the performed operation. In many designs, the ALU also has status inputs or outputs, or both, which convey information about a previous operation or the current operation, respectively, between the ALU and external status registers. An ALU has a variety of input and output nets , which are the electrical conductors used to convey digital signals between the ALU and external circuitry. When an ALU is operating, external circuits apply signals to the ALU inputs and, in response, the ALU produces and conveys signals to external circuitry via its outputs. Each data bus is a group of signals that conveys one binary integer number.

The basic operations are implemented in hardware level. ALU is having collection of two types of operations:. To identify any one of these four logical operations or four arithmetic operations, two control lines are needed. Also to identify the any one of these two groups- arithmetic or logical, another control line is needed. So, with the help of three control lines, any one of these eight operations can be identified. Consider an ALU is having four arithmetic operations. Addition, subtraction, multiplication and division.

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### Control unit

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PDF | On Oct 24, , Subarna Shakya published Arithmetic & Logic Unit Arithmetic. Logic Unit. (ALU). The Simplest Computer Building Blocks. Instruction Register (IR) Program Counter (PC). 0. 1. Control Unit (CU). ALU.

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