Logical Address Space vs. Physical Address Space

One way in which the memory-management unit can perform the mapping is by using the base register, which we call the relocation register, as displayed in the diagram below. We simply add the value at the relocation register to the logical address to get the physical address.

User programs never see physical addresses and work entirely in logical address space.

Dynamic relocation using a relocation register. Derived from Bell, John T. "Main Memory." University of Illinois, Chicago.