The CPU can instantly (and linearly) deal with the entire out there memory places without having to resort to any type of bank switching, memory segmentation or paging schemes. Memory management and address translation can still be carried out on high of a flat memory mannequin in order to facilitate the operating system's performance, resource protection, multitasking or to increase the memory capacity beyond the limits imposed by the processor's physical address area, however the key function of a flat memory model is that your complete memory area is linear, sequential and contiguous. In a simple controller, or in a single tasking embedded software, the place memory administration is not needed nor desirable, the flat memory mannequin is probably the most acceptable, as a result of it offers the simplest interface from the programmer's point of view, with direct access to all memory places and minimum design complexity. In a normal purpose pc system, which requires multitasking, resource allocation, and protection, the flat memory system have to be augmented by some Memory Wave management scheme, which is typically applied by way of a mix of devoted hardware (inside or outdoors the CPU) and software program constructed into the operating system. The flat memory mannequin (on the bodily addressing stage) still gives the best flexibility for implementing this sort of memory management. This memory mannequin is required when using Physical Deal with Extension (PAE) in Pentium Professional and later x86 CPUs to assist 36-bit physical addresses to deal with more than 4GB of bodily memory. Implemented in the original Intel 8086, 8088, 80186, 80286, and supported by 80386 and all subsequent x86 machines by way of to present day Pentium and Core 2 processors. This memory model has remained ever since within the x86 machines, which now present multi-mode operation and rarely operate within the suitable segmented mode. See x86 memory segmentation for details. RAM by shifting the segment deal with, this permits short jumps that require fewer bytes. Gonzalez, Antonio
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Flat Memory Mannequin
Cassie Murry edited this page 3 days ago