BUSES

BUS

what is a BUS?

    A bus is a communication path way connecting two or more devices.

Take the motherboard and look at the bottom side of it, you can see lines connection to each element. That is a bus

How does a Bus work?

·         To send data to another device

o   First the module must get permission to use the bus, and then only can send the data

·         To request data from another device

o   First the module must get permission to use the bus, and then send a request signal to the other device and finally wait for the device to send the data.

for more information of the bus take a look at the mindmap below

System Bus consist of

Data Bus-   Carry data, instruction and address between main memory and ALU

      ..Control Bus-Cary signals such as interrupt, timing and acknowledgment to and from other components.

Address Bus-Used to transfer address from PC to memory.

BUS HIERARCHY

The Characteristics of a BUS

The performance of a bus can be measured by using these factors

o   Transfer Time

§  Amount of time taken for a data to be delivered in a single transaction

o   Bandwidth

§  Measures the capacity of the bus

How much can the bus send at one time