In contrast, all physical addresses mapped to corresponding logical addresses are called Physical Address Space. Logical Address Space is the set of all logical addresses generated by the CPU for a program. In contrast, the physical address is a location that exists in the memory unit. The basic difference between Logical and physical addresses is that The CPU generates a logical address from a program's perspective. Difference between Logical and Physical Address The Physical Address Space is used for all physical addresses corresponding to the logical addresses in a logical address space. Therefore, the logical address must be mapped to the physical address by MMU before they are used. The user program generates the logical address and thinks it is running in it, but the program needs physical memory for its execution. The user never directly deals with the physical address but can access it by its corresponding logical address. The physical address identifies the physical location of required data in memory. The hardware device called Memory-Management Unit is used for mapping logical addresses to their corresponding physical address. This logical address (generated by CPU) combines with the base address generated by the MMU to form the physical address. The user program that generates the logical address assumes that the process runs on locations between 0 and max. The term Logical Address Space is used to set all logical addresses generated from a program's perspective.Ī logical address usually ranges from zero to maximum (max). This address is used as a reference to access the physical memory location by CPU. The logical address is a virtual address as it does not exist physically, and therefore, it is also known as a Virtual Address. What is a Logical Address?Ī logical address is an address that is generated by the CPU during program execution. In contrast, the physical address refers to a location in the memory unit. The fundamental difference between logical and physical addresses is that the CPU generates the logical address during program execution. The logical address is used as a reference to access the physical address. The user can't view the physical address directly.
The logical address is a virtual address viewed by the user. There are two types of addresses used for memory in the operating system, i.e., the physical address and logical address. We store the data in the memory at different locations with addresses to access the data again whenever required in the future.
VIRTUAL ADDRESS CODE
The addresses identify a location in the memory where the actual code resides in the system in the operating system. Next → ← prev Difference between Virtual and Physical Address
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