BUSES (in computer)

Memory and I/O devices are connected to the CPU through a group of lines called a bus.These lines are meant to carry information.These are three types of buses:address bus,data us and control bus.An address bus carries the address of a memory location or an I/O devices that the CPU wants to access.The address bus is unidirectional.The data and control buses are bidirectional because the data can flow in either direction;from CPU to memory (or I/O device) or from memory (or I/O devices) to the CPU.Examples of control signals are:

fig1 shows the schematic diagram of I/O or memory connection to CPU.

Different types of bus architectures such as ISA,PCI,AGP,USB etc.