Central Processing Unit (CPU) or in other words, the Processor, is recognized as the brain of a computer system. All the instructions, calculations, logical and arithmetic operations, and I/O operations are performed and executed from this unit. The fundamental operation includes the execution of some instructions stored in the physical memory, which is also called a program. A program consists of some series of numbers arranged in a logical form.
For any kind of CPUs, the basic steps of operations are the same. Generally, those are represented as fetch, decode, execute and mark back. Firstly, the fetch step recovers the stored instructions from the memory, and then the decoding step decodes the instruction for creating a significant signal to the different parts of the CPU. After that, execution takes place, in this step; various parts of the CPU join themselves accordingly to perform the requested task.
Finally, in the mark back step, it marks or writes the instruction found in the execution step in a form of memory for quick future operation. Processors from different brands like Intel, AMD, Compaq, Samsung, Dell, Ncr, Alcatel, are available for an affordable price.
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