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من طرف Nahla الإثنين مايو 05, 2008 6:14 pmCPU is the main part inside the case. It is the brain of the computer, so it's the most important unit which is called (Central Processing Unit). It translates entered data and processes it, then it'll send it either to the output units or to be saved on one of the secondary storage units.
The CPU contains two circuit elements that perform tasks and several memory locations where data/instructions are held temporarily while actions are performed.
The main parts of the CPU are:
- ALU : Arithmetic logic Unit which performs arithmetic and logic operations, such as : + , - , x , ÷ , <, >,= , ≠, ≤ , ≥ ….etc.
- CU : Control Unit which is responsible to send information % instructions on how a job should be done.
Reading & explaining instructions
Sending operation to the CPU
Controlling all data between the memory & the input / output units
- Registers. Temporary storage locations.
CPU Block Diagram
The basic operation of the CPU can be illustrated with the following diagram. (Assumed computer word size is 8-bits with 16-bit address line, like a 64K personal computer. Modern computers are much more complex.)
Commands and instructions flow to the CPU and data is moved back and forth.
All information needed is addressed by the CPU as is all transfer to and from memory. In modern designs some of these tasks are carried out by auxiliary processors.
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