Sunday, November 23, 2008
BUS
In a computer or on a network, a bus is a transmission path on which signals are dropped off or picked up at every device attached to the line. Only devices addressed by the signals pay attention to them; the others discard the signals. According to Winn L. Rosch, the term derives from its similarity to autobuses that stop at every town or block to drop off or take on riders.
General Term Used in Two Different Contexts
(1) A bus is a network topology or circuit arrangement in which all devices are attached to a line directly and all signals pass through each of the devices. Each device has a unique identity and can recognize those signals intended for it.
(2) In a computer, a bus is the data path on the computer's motherboard that interconnects the microprocessor with attachments to the motherboard in expansion slots (such as hard disk drives, CD-ROM drives, and graphics adapters).
In a computer or on a network, a bus is a transmission path on which signals are dropped off or picked up at every device attached to the line. Only devices addressed by the signals pay attention to them; the others discard the signals. According to Winn L. Rosch, the term derives from its similarity to autobuses that stop at every town or block to drop off or take on riders.
General Term Used in Two Different Contexts
(1) A bus is a network topology or circuit arrangement in which all devices are attached to a line directly and all signals pass through each of the devices. Each device has a unique identity and can recognize those signals intended for it.
(2) In a computer, a bus is the data path on the computer's motherboard that interconnects the microprocessor with attachments to the motherboard in expansion slots (such as hard disk drives, CD-ROM drives, and graphics adapters).
Data Bus
A "bus" is the electronic path that data travels in the set-top box (or in another type of processor and/or computerized device.) The wider the width of the bus the faster the data can travel. The data bus carries the actual electronic signal versus the address bus that carries information concerning where the data needs to go.
A "bus" is the electronic path that data travels in the set-top box (or in another type of processor and/or computerized device.) The wider the width of the bus the faster the data can travel. The data bus carries the actual electronic signal versus the address bus that carries information concerning where the data needs to go.
Address Bus 
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).
For example, a 20-line address bus represents the binary number 1,048,576 and reaches that number of memory bytes (the size of the address bus in the IBM PC in 1981). A computer with a 32-bit address bus can directly address 4GB of physical memory, while one with 36 bits can address 64GB.
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).
The address bus is the set of lines that carry information about where in memory the data is to be transferred to or from. No actual data is carried on this bus, rather memory addresses, which control the location that data is either read from or written to, are sent here.
The speed of the address bus is the same as the data bus it is matched to.
The address bus is the set of wire traces that is used to identify which address in memory the CPU is accessing.
The address bus is the set of wire traces that is used to identify which address in memory the CPU is accessing.
An internal channel from the CPU to memory across which the addresses of data (not the data) are transmitted. The number of lines (wires) in the address bus determines the amount of memory that can be directly addressed as each line carries one bit of the address.
For example, a 20-line address bus represents the binary number 1,048,576 and reaches that number of memory bytes (the size of the address bus in the IBM PC in 1981). A computer with a 32-bit address bus can directly address 4GB of physical memory, while one with 36 bits can address 64GB.
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