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Encyclopedia > Address bus
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An address bus is (part of) a computer bus, used by CPUs or DMA-capable units for communicating the physical addresses of computer memory elements/locations that the requesting unit wants to access (read/write). In computer architecture, a bus is a subsystem that transfers data or power between computer components inside a computer or between computers. ... This article needs to be cleaned up to conform to a higher standard of quality. ... Direct memory access (DMA) allows certain hardware subsystems within a computer to access system memory for reading and/or writing independently of the CPU. Many hardware systems use DMA including disk drive controllers, graphics cards, network cards, and sound cards. ...

The width of an address bus, along with the size of addressable memory elements, determines how much memory can be accessed. For example, a 16-bit wide address bus (commonly used in the 8-bit processors of the 1970s and early 1980s) reaches across 2 to the power of 16 = 65,536 = 64K memory locations, whereas a 32-bit address bus (common in today's PC processors) can address 4,294,967,296 = 4G locations. In computer science, 16-bit is an adjective used to describe integers that are at most two bytes wide, or to describe CPU architectures based on registers, address buses, or data buses of that size. ... 8-bit refers to the number of bits used in the data bus of a computer. ... Kilo (symbol: k) is a prefix in the SI system denoting 103 or 1000. ... 32-bit is a term applied to processors, and computer architectures which manipulate the address and data in 32-bit chunks. ... 2004 is a leap year starting on Thursday of the Gregorian calendar. ... Giga (symbol: G) is a prefix in the SI system of units denoting 109, or 1 000 000 000. ...

In most microcomputers the addressable elements are 8-bit bytes (so a "K" in that case is equal to a "KB", i.e. a kilobyte), while there are also many examples of computers with larger "chunks" of data as their minimum physically addressable elements, notably mainframes, supercomputers, and some workstation CPUs. Apple IIc Hi class Although there is no rigid definition, a microcomputer (sometimes shortened to micro) is most often taken to mean a computer with a microprocessor (µP) as its CPU. Another general characteristic of these computers is that they occupy physically small amounts of space. ... A byte is commonly used as a unit of storage measurement in computers, regardless of the type of data being stored. ... A kilobyte (derived from the SI prefix kilo-) is a unit of information or computer storage equal to either 1024 or 1000 bytes. ... Jump to: navigation, search A 1990 Honeywell-Bull DPS 7 mainframe CPU Mainframes (often colloquially referred to as big iron) are large and expensive computers used mainly by government institutions and large companies for mission critical applications, typically bulk data processing such as censuses, industry/consumer statistics, ERP, and financial... We use computer to go on the porn site ... A computer workstation, often colloquially referred to as workstation, is a high-end general-purpose microcomputer designed to be used by one person at a time and which offers higher performance than normally found in a personal computer, especially with respect to graphics, processing power and the ability to carry...

See also

  Results from FactBites:
Use of deferred bus access for address translation in a shared memory clustered computer system - Patent 5682512 (8152 words)
If the global address to which access is requested by the bus agent does not correspond to a local address, as determined by the address translation and control circuit, then the global address access request is passed to the bridge input/output circuit for communication of the request to the second node.
In this case the global address of the request is passed to the address translation and control circuit and, if the global address corresponds to a local address of the node, a local address access request is issued on the bus using a local address corresponding to the received global address.
The requested address is passed to the address decode and translation circuit 58, which determines whether the requested address is within the re-mapped global address space corresponding to the fixed address space for the local node, by reference to the information provided in the address translation table memory 60.
Bus switch coupling for series-coupled address bus sections in a microprocessor - Patent 4016546 (8511 words)
The bus control and coupling circuitry as recited in claim 2 further including preconditioning means coupled to each of said bus conductors of said second group and to said control means for presetting each of said bus conductors of said second group to a predetermined level under control of said control means.
The first address bus section is further split by means of an address bus switch which controllably couples each conductor of the first address bus section to a corresponding conductor of a third address bus section.
In extended addressing, the address contained in the second byte of the instruction is used as the higher eight-bits of the address of the operand.
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