About: Flat memory model

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Flat memory model or linear memory model refers to a memory addressing paradigm in which "memory appears to the program as a single contiguous address space." The CPU can directly (and linearly) address all of the available memory locations without having to resort to any sort of memory segmentation or paging schemes.

Attributes	Values
rdfs:label	Flat memory model (en)
rdfs:comment	Flat memory model or linear memory model refers to a memory addressing paradigm in which "memory appears to the program as a single contiguous address space." The CPU can directly (and linearly) address all of the available memory locations without having to resort to any sort of memory segmentation or paging schemes. (en)
sameAs	Flat memory model
dbp:wikiPageUsesTemplate	dbt:Clarify dbt:Cleanup dbt:Main dbt:More_citations_needed dbt:Multiple_issues dbt:Prose dbt:Reflist dbt:Why
Subject	Computer memory
prov:wasDerivedFrom	http://en.wikipedia.org/wiki/Flat_memory_model?oldid=1057861454&ns=0
Wikipage page ID	450937 (xsd:integer)
page length (characters) of wiki page	5846 (xsd:nonNegativeInteger)
Wikipage revision ID	1057861454 (xsd:integer)
Link from a Wikipage to another Wikipage	X86 X86 memory segmentation 8-bit computing Address space Addressing mode CPU cache Computer memory Central processing unit Physical Address Extension Tux Complex instruction set computer Computer memory Computer multitasking Motorola 68000 series Operating system I386 Pentium Pentium Pro Intel 80186 Intel 80286 Intel 8086 Intel 8088 Intel Core 2 Memory address Memory model Memory paging Memory segmentation Real mode
has abstract	Flat memory model or linear memory model refers to a memory addressing paradigm in which "memory appears to the program as a single contiguous address space." The CPU can directly (and linearly) address all of the available memory locations without having to resort to any sort of memory segmentation or paging schemes. Memory management and address translation can still be implemented on top of a flat memory model in order to facilitate the operating system's functionality, resource protection, multitasking or to increase the memory capacity beyond the limits imposed by the processor's physical address space, but the key feature of a flat memory model is that the entire memory space is linear, sequential and contiguous. In a simple controller, or in a single tasking embedded application, where memory management is not needed nor desirable, the flat memory model is the most appropriate, because it provides the simplest interface from the programmer's point of view, with direct access to all memory locations and minimum design complexity. In a general purpose computer system, which requires multitasking, resource allocation, and protection, the flat memory system must be augmented by some memory management scheme, which is typically implemented through a combination of dedicated hardware (inside or outside the CPU) and software built into the operating system. The flat memory model (at the physical addressing level) still provides the greatest flexibility for implementing this type of memory management. The majority of processor architectures implement a flat memory design, including all early 8-bit processors, the Motorola 68000 series, etc. One exception was the original 8086, Intel's first 16-bit microprocessor, which implemented a crude segmented memory model which allowed access to more than 64 KiB of memory without the cost of extending all addresses to more than 16-bits. (en)
foaf:isPrimaryTopicOf	http://en.wikipedia.org/wiki/Flat_memory_model
is Wikipage redirect of	Linear address Linear address space Linear addressing Flat address space
is Link from a Wikipage to another Wikipage of	Logical address Logical block addressing NX bit OS/2 32-bit computing Address space Atari TOS BBC Micro Digital audio workstation Message Passing Interface History of the graphical user interface Microsoft Visual C++ Database engine I386 Intel 8051 Intel Memory Model Intel iAPX 432 Memory address Memory architecture Memory management unit Memory model Memory segmentation Linear address Linear address space Linear addressing Flat address space
is foaf:primaryTopic of	http://en.wikipedia.org/wiki/Flat_memory_model

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