MP-based system with BUS ARCHITECTURE----

System bus = address bus + data bus + memory + I/O control lines + CPU + bus control lines + utility bus

Bus- 

electrical lines thru which s/g flows frm peripheral -i/o devices . The system bus is a communication path btw mp and peripherals. it is nothing but a grp of wires to carry bits. all peripherals(and memory) share d same bus. However, mp communicates with only one peripheral at a time . Timing is provided by the control unit of mp.

Even though a mp may have a wide variety of architecture features & capabilities, but all of them should have following functional components.

Register Section-

Contains some on-chip registers as hardware which are used for temporary storage of data or info or address of data.

ALU-

It is also a hardware unit which is used to perform primitive arithmetic operation ,ex- +ve, -ve, & logical operation -> and ,or , ex-or etc.

Interface section-

it provides some hardware i/p , o/p lines thru which mp or CPU communicates with outside world .

Timing and control unit-

it provide necessary timing and control s/g to all operation in MP . It is HEART of a MP which coordinates and controls various activities within MP and btw MP & external devices.