13 Facts About External bus

In computer architecture, a External bus is a communication system that transfers data between components inside a computer, or between computers.

The External bus connecting the CPU and memory is one of the defining characteristics of the system, and often referred to simply as the system External bus.

An address External bus is a External bus that is used to specify a physical address.

The width of the address External bus determines the amount of memory a system can address.

For example, a 32-bit address External bus can be implemented by using 16 lines and sending the first half of the memory address, immediately followed by the second half memory address.

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Memory External bus is the External bus which connects the main memory to the memory controller in computer systems.

An attribute generally used to characterize a External bus is that power is provided by the External bus for the connected hardware.

Simplest system External bus has completely separate input data lines, output data lines, and address lines.

Early microcomputer External bus systems were essentially a passive backplane connected directly or through buffer amplifiers to the pins of the CPU.

Memory and other devices would be added to the External bus using the same address and data pins as the CPU itself used, connected in parallel.

All the equipment on the External bus had to talk at the same speed, as it shared a single clock.

Such External bus systems are difficult to configure when constructed from common off-the-shelf equipment.

The result was that the External bus speeds were now very much slower than what a modern system needed, and the machines were left starved for data.