Von Neumann’s archtectre is still used it todays modern CPU’S.
The CPU
This diagram represents the structure of the Central Processing System.
Arithmetic Logic Unit
The ALU performs addition and subtraction, logic operations, masking, and shifting (multiplication and division).
Control Unit
The Control Unit is the heart of the computer. It controls and co-ordinates the systems operations. This contains the system clock, program counter and the instruction register. It also manages the signals from the control bus.
Registers
This is a form of high-speed memory which is contained inside of the CPU. All data must be represented in a register before it can be processed. Information is stored temporarily in the registers in which text or buffer positions or rectangles can be saved for later use.
Buses
A bus is a channel or path between the components in a computer. Having a high-speed bus is important. A bus lets you connect computers components to the processor.
The advantage of a bus is that it makes parts more interchangeable. If you want to get a better graphics card, you simply unplug the old card from the bus and plug in a new one. If you want two monitors on your computer, you plug two graphics cards into the bus. And so on.
A PC usually has two buses. The first connects the CPU and the system memory. This is the fastest bus in the system. The second bus is the slower and it connects other devices, like the hard disk, CD drive, graphics card etc. These slower buses connect to the system bus through a bridge which integrating the data from the other buses to the system bus.
RAM
Random Access Memory is the place in a computer where the operating system, application programs, and data in current use are kept temporarily so that they can be quickly reached by the computer's processor. The RAM is plugged on to the mother board and the processor accesses the RAM via buses.
