Full Form of ALU – Arithmetic Logic Unit

The full form of ALU is “Arithmetic Logic Unit”. An arithmetic-logic unit is the part of a central processing unit that carries out arithmetic and logic operations on the operands in computer instruction words. ALU is responsible for all the logical operations performed by the CPU.

In the previous section, we discussed the full form of ALU. Now we are going to see how the ALU works. Typically, the ALU has direct input and output access to the processor controller, main memory (random access memory or RAM in a personal computer), and input/output devices. Inputs and outputs flow along an electronic path that is called a bus. The bus works as a connector between the Input and Output devices.

The input consists of an instruction word, sometimes called machine instructions, that contains an operation code or “opcode,” one or more operands, and sometimes a format code for the computer. The operation code tells the ALU what operation to perform and the operands used in the operation.

For example, two operands might be added together or compared logically by using various logical operations. The format may be combined with the opcode and tells, for example, whether this is a fixed-point or a floating-point instruction.

The output consists of a result that is placed in a storage register and settings that indicate whether the operation was performed successfully or remains incomplete. If it isn’t, some sort of status will be stored in a permanent place that is sometimes called the machine status word.

In general, the ALU includes storage places for input operands, operands that are being added, the accumulated result (stored in an accumulator), and shifted results. The flow of bits and the operations performed on them in the subunits of the ALU are controlled by gated circuits.

In this article, we have discussed the full form of ALU, its functionality of ALU, and its operation of ALU. Now we are going to see some of the functions which are supported by ALU. In computer science, ALUs serve as a combinational digital circuit that performs arithmetic and bitwise operations on binary numbers. This is a foundational building block of arithmetic logic circuits for numerous types of control units and computing circuits including central processing units (CPUs), FPUs, and graphics processing units. Know more about full form of ALU here.

The full form of ALU is Arithmetic Logic Unit. Abbreviation of the arithmetic logic unit, the part of a computer that performs all arithmetic computations.

ALU stands for Arithmetic and Logical Unit which performs Arithmetic functions like Addition, subtraction, division, etc. CU stands for control unit which performs the task of controlling functions of the computer.

What is an arithmetic-logic unit (ALU)? An arithmetic-logic unit is the part of a central processing unit that carries out arithmetic and logic operations on the operands in computer instruction words.

An ALU consists of three types of functional parts: store-age registers, operations logic, and sequencing logic. Here we have also described about the full form of ALU.

The size of input quantities of ALU is often referred to as the word length of the computer. Many processors today have a word length of 32 and 64 bits.

The ALU has two 32-bit inputs (which we’ll call “A” and “B”) and produces one 32-bit output.

II.1 Bit – ALU. The digital function that implements the micro-operations on the information stored in registers is commonly called an Arithmetic Logic Unit (ALU).

General Description. The DM74LS181 is a 4-bit Arithmetic Logic Unit (ALU) that can perform all the possible 16 logic operations on two variables and a variety of arithmetic operations.

2-BIT ALU } An arithmetic logic unit is a multi-operation, combinational logic function. It can perform a set of basic arithmetic operations and a set of logic operations.

When the ALU gets a command to subtract it is given 2 numbers – it makes a NOT to every bit of the second number and makes a simple addition and adds 1 more (because 2’s complement is NOT to every bit +1). Know more about full form of ALU at Wiki.

One operand for the ALU is always contained in a register. The other operand may be in a register or may be part of the machine instruction itself.

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