Does this cover the syllabus for Operating System (OS) Notes in English?

Yes, this chapter covers key concepts of 'Logical and Physical Address in Operating System' under the Operating System (OS) Notes in English syllabus for BCA / B.Tech.

How long does it take to read 'Logical and Physical Address in Operating System'?

This note is approximately a 12-minute read.

Logical and Physical Address in Operating System - (BCA / B.Tech)

Q: Is the note for 'Logical and Physical Address in Operating System' free to read?

Yes, NotesMedia provides free access to 'Logical and Physical Address in Operating System' notes for BCA / B.Tech preparation online.

Logical and Physical Address in Operating System:

In a computer system's memory management, logical and physical addresses are two key concepts. To execute a program, the processor (CPU) fetches data and instructions from memory, which are located at specific addresses. Logical and physical addresses determine how the processor accesses memory and executes the program.

Logical Address (or Virtual Address):

A logical address is an address viewed from the program's perspective. It is generated by the CPU when a program is executing an instruction. This address is what the programmer sees and is available at the user level.

Characteristics:

It is a virtual address, not directly understood by the hardware. It must be translated to a physical address.
Each process has its own separate logical address space, independent of physical memory.

Physical Address:

A physical address is the address actually used to store or access data in the computer's physical memory (RAM). It is the address communicated between the CPU and the memory unit.

Characteristics:

It is the real address in the computer's RAM.
It is at the hardware level and not directly controlled or accessed by the user.
The physical address space represents the actual memory of the computer.

Difference between Logical and Physical Address:

A logical address is virtual and generated by the CPU during program execution, visible at the user level. A physical address is the real address in the computer's RAM, at the hardware level. The Memory Management Unit (MMU) translates the logical address into a physical address.

Translation from Logical to Physical Address:

The Memory Management Unit (MMU) is used to convert a logical address into a physical address. This process is called address translation. The main goal is to ensure each process gets the memory it needs without interfering with another process's memory.

Translation Process:

Logical Address Generation: The CPU generates a logical address when a program tries to access memory.
Memory Management Unit (MMU): The MMU takes the logical address and converts it into a physical address. A common method is to add a `base address` to the logical address.
Physical Memory Access: The processor uses the physical address to access the data or instruction from RAM.

Logical and Physical Address in Operating System

Logical and Physical Address in Operating System:

In this Chapter