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In Data Ins<math><s>Insert formula here</s><!-- <blockquote> Comment </blockquote> --></math>ert non-formatted text hereNetworks: In computer networks, a logical address refers to a network layer address such as an IP address, an X.25/X.121 or IPX address. The network layer is third layer out of seven in OSI model and it is the third layer out of five in TCP/IP model. ...
An IP address (Internet Protocol address) is a unique address that certain electronic devices currently use in order to identify and communicate with each other on a computer network utilizing the Internet Protocol standard (IP)—in simpler terms, a computer address. ...
X.25 is an ITU-T standard protocol suite for wide area networks using leased lines, the phone or ISDN system as the networking hardware. ...
X.121 is the ITU-T address format of the X.25 protocol suite used as part of call setup to establish a switched virtual circuit between Public Data Networks (PDNs), connecting two network user addresses (NUAs). ...
See also Ericsson IPX Internetwork Packet Exchange (IPX) is the OSI-model Network layer protocol in the IPX/SPX protocol stack. ...
In Computer Architecture In computer architectures, a logical address is the address at which a memory location appears to reside from the perspective of an executing application program. This may be different from the physical address due to the operation of a memory management unit (MMU) between the CPU and the memory bus. Physical memory may be mapped to different logical addresses for various purposes. For example, the same physical memory may appear at two logical addresses and if accessed by the program at one address, data will pass through the processor cache whereas if it is accesed at the other address, it will bypass the cache. A typical vision of a computer architecture as a series of abstraction layers: hardware, firmware, assembler, kernel, operating system and applications (see also Tanenbaum 79). ...
Computer software (or simply software) refers to one or more computer programs and data held in the storage of a computer for some purpose. ...
In computer science, a physical address is the address presented to a computers main memory in a virtual memory system, in contrast to the virtual address which is the address generated by the CPU. Virtual addresses are translated into physical addresses by a memory management unit (abbreviated MMU). ...
This 68451 MMU could be used with the Motorola 68010 MMU, short for memory management unit or sometimes called paged memory management unit as PMMU, is a class of computer hardware components responsible for handling memory accesses requested by the CPU. Among the functions of such devices are the translation...
CPU can stand for: in computing: Central processing unit in journalism: Commonwealth Press Union in law enforcement: Crime prevention unit in software: Critical patch update, a type of software patch distributed by Oracle Corporation in Macleans College is often known as Ash Lim. ...
For other uses, see cache (disambiguation). ...
In a system supporting virtual memory, there may actually not be any physical memory mapped to a logical address until an access is attempted. The access triggers special functions of the operating system which reprogram the MMU to map the address to some physical memory, perhaps writing the old contents of that memory to disk and reading back from disk what the memory should contain at the new logical address. In this case, the logical address may be referred to as a virtual address. The program thinks it has a large range of contiguous addresses; but in reality the parts it is currently using are scattered around RAM, and the inactive parts are saved in a disk file. ...
Other Uses Logical address or virtual address is also used in IBM's VM operating system and in Virtual Device Location. For other uses, see IBM (disambiguation) and Big Blue. ...
VM is an early and influential virtual machine operating system from IBM, apparently the first true virtual machine system. ...
See also Virtual address In computer terminology a virtual address is an address not identifying a logical interface or device, but to a virtual (not physical) entity. ...
On the Intel x86 architecture, a memory segment is the portion of memory which may be addressed by a single index register without changing a 16-bit segment selector. ...
In computer programming, the flat memory model is an approach to organizing memory address space. ...
External links - FOLDOC virtual address entry
This article was originally based on material from the Free On-line Dictionary of Computing, which is licensed under the GFDL. This article does not cite any references or sources. ...
“GFDL†redirects here. ...
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