Sage-Tips

Why do we need logical address in addition to physical address?

Logical address is used to reference to access the physical memory location. A logical address is generated so that a user program never directly access the physical memory and the process donot occupies memory which is acquired by another process thus corrupting that process.

Why does CPU generate logical address?

Logical Address is generated by CPU while a program is running. The logical address is virtual address as it does not exist physically, therefore, it is also known as Virtual Address. This address is used as a reference to access the physical memory location by CPU.

How the logical address generated by the CPU is translated to a physical address of a word in main memory?

A logical address is generated by the CPU and is translated into a physical address by the memory management unit(MMU). Therefore, physical addresses are generated by the MMU.

How logical address is mapped with physical address?

Address binding is the process of mapping from one address space to another address space. Logical addresses are generated by CPU during execution whereas physical address refers to location in a physical memory unit (the one that is loaded into memory). Note that users deal only with logical address (virtual address).

Why physical address is required?

Why we need a Physical Address? The MAC address is used to identify a specific device in a network. This can be used to automate the validation process in a network connection.

What is the difference between physical and logical memory?

Physical memory is RAM; Actually belongs to main memory. Logical address is the address generated by CPU. In paging,logical address is mapped into physical address with the help of page tables.

What is logical address in operating system?

In computing, a logical address is the address at which an item (memory cell, storage element, network host) appears to reside from the perspective of an executing application program. A logical address may be different from the physical address due to the operation of an address translator or mapping function.

What is the differences between physical and logical address and why do we need logical addresses?

The logical address is used like a reference, to access the physical address. The fundamental difference between logical and physical address is that logical address is generated by CPU during a program execution whereas, the physical address refers to a location in the memory unit.

What is a physical address on a computer?

In computing, a physical address (also real address, or binary address), is a memory address that is represented in the form of a binary number on the address bus circuitry in order to enable the data bus to access a particular storage cell of main memory, or a register of memory-mapped I/O device.

How does a physical address work?

What do you need a physical address for?

A Physical Address is a real street address that you can use for business or personal use. Because Physical Addresses are real street addresses, not a PO Box, you can register your business and receive packages from any carrier, including FedEx and UPS.

How does a CPU generate a logical address?

That said, commonly logical addresses are not generated by the CPU, CPUs just use logical addressing to do memory lookups. They need another entity to map logical addresses to actual physical memory locations. Why?

What is logical address translation in CPU?

These logical addresses map to the same physical addresses the same for all processes. In larger applications, it is common for processes to share the same physical memory. That is done through logical address translation. My second question is How is this logical address produced by CPU?

How are identical logical addresses generated?

Identical logical addresses are generated by Compile-time and Load time address binding methods whereas they differs from each other in run-time address binding method. Please refer this for details. The logical address is generated by the CPU while the program is running whereas the physical address is computed by the Memory Management Unit (MMU).

What is the difference between logical and physical address in operating system?

Differences Between Logical and Physical Address in Operating System The basic difference between Logical and physical address is that Logical address is generated by CPU in perspective of a program whereas the physical address is a location that exists in the memory unit.