Join 60,000+ competitive exam aspirants
or with email
Your Cart
Subtotal₹0
Total₹0
Examoogle • User • info@examoogle.com • EE-2024-8821
Chapter 1 of 12 • Page 1 of 248🔒 Protected PDF • Watermarked
Join 60,000+ competitive exam aspirants
What is mean by ALU?
Arithmetic logic upgrade
Arithmetic logic unit
Arithmetic logic union
None
Arithmetic logic unit
The Arithmetic Logic Unit (ALU) is a fundamental building block of a central processing unit (CPU). It performs all arithmetic operations (like addition, subtraction) and logical operations (like AND, OR, NOT) required to process binary data.
The Arithmetic Logic Unit (ALU) is a fundamental building block of a central processing unit (CPU). It performs all arithmetic operations (like addition, subtraction) and logical operations (like AND, OR, NOT) required to process binary data.
R=A⊕B — Logical XOR operation example
Cout=(A⋅B)+(Cin⋅(A⊕B)) — Carry out logic for a full adder
The ALU receives binary operands from the CPU registers or memory along with a control signal from the Control Unit (CU) that specifies the operation to be performed. The logic circuits (adders, multiplexers, and gates) process the input data to produce the desired output, while status flags (Carry, Zero, Overflow) are updated in the Status Register to indicate the nature of the result.
The ALU is the combinational logic core of the processor.
It handles integer arithmetic, bitwise logic, and comparisons.
The Control Unit directs the ALU to perform operations based on the instruction register.
Results often affect status registers (FLAGS) such as the Zero flag or Carry flag.
High-speed data processing
Essential for complex mathematical computation
Limited by word size of the architecture
Power consumption increases with clock frequency
General purpose CPUs
Microcontrollers
Digital Signal Processors (DSPs)
ALUs are designed to be part of the Von Neumann or Harvard architecture.
Option A is incorrect because it is not an upgrade; Option C is incorrect as it implies a set theory union operation rather than the standard functional unit definition.
B is correct — ALU stands for Arithmetic Logic Unit, the component responsible for performing mathematical and logical operations in a CPU.
Always remember that the ALU is a purely combinational circuit; it does not store data itself, which is why it requires registers for temporary storage.