address bus

An address bus is 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).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 216 = 65,536 = 64Ki memory locations, whereas a 32-bit address bus (common in today's PC processors) can address 232 = 4,294,967,296 = 4Gi locations.
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<processor> The connections between the CPU and memory which carry the address from/to which the CPU wishes to read or write. The number of bits of address bus determines the maximum size of memory which the processor can access.
See also data bus.
(1995-03-22)

address bus
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