The CPU is connected to memory and various other I/O devices through strips of wires called buses. These buses just take the data, address and control signals from one place to another.
There are three types of buses :-
#1 Data Bus. (Bidirectional)
# 2 Address Bus. (Unidirectional)
#3 Control Bus. (Unidirectional)
The data bus is used for carrying data in and out from the CPU. The data bus determines the performance of the CPU, more the data lines in a data bus better is the CPU. The average size of data bus varies from 8 bit to 64 bit.
The address bus is used to identify the device and memory connected to CPU. If CPU wants to communicate with device or a memory, it just loads its address on the address bus and device or location having that add becomes active.
The control bus is used for sending control signal to the addressed device or memory for performing read and write operations at that location.
