(i). Data Bus.
It is a bi-directional (2-way) bus that carries information & data to and from the Processor, i.e., it carries data from the Processor to the memory during Write operations & from memory to the Processor during Read operations.
The Data bus usually carries data for processing.
It consists of 4, 8 or 16 lines each carrying 1 bit at a time.
Note. The Data Bus determines the Bus Width of the microprocessor. Its size indicates the
moving capability of information of the chip.
(ii). Address Bus.
It is a unidirectional (1-way) bus from the Processor to the external devices. It usually contains the address of the memory location or device to be acted on by the Processor (i.e. it conveys addresses).
The Address bus is wide (usually between 4 – 32 lines) to enable it to address as many devices as possible.
The size of the Address Bus tells you how much memory the chip can handle.
(iii). Control Bus.
It’s a unidirectional (1-way) bus that carries command (i.e. timing & control) signals from the Processor. These signals are necessary to coordinate the activities of the entire system. For example, the command for the Printer to prepare to receive data is a control signal from the processor.
They usually have 3 – 10 lines.
Githiari answered the question on October 10, 2017 at 09:56
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