Project- 01

IT SCHOLARSHIP PROJECT  NETWORKING PROFESSIONAL

EVIDENCE TEST No 1

SUBJECT OF PRESENTATION :  PROCESSOR OR CPU

PRESENTATION CREDIT BY :Md Abdul Gofur

THE CPU

·„ Complex set of electronic circuitry „

·Control center

·  Set of electronic circuitry that  executes stored program instructions

·„ Two parts

1. % Control Unit (CU)

2. % Arithmetic Logic Unit (ALU)

Control Unit: CU 

1.Part of the hardware that is in-  charge

2.Directs the computer system to  execute stored program instructions „

3.Must communicate with memory  and ALU „

4.Sends data and instructions from  secondary storage to memory as  needed

Arithmetic Logic Unit 

Executes all arithmetic and logical

operations

Arithmetic operations

Addition, subtraction, multiplication, division

Logical operations

1. Compare numbers, letters, or special characters

2. Tests for one of three conditions

• Equal-to condition „

• Less-than condition „

• Greater-than condition

Data Storage and the CPU 

Two types of storage

Primary storage (memory)

• Stores data temporarily

• CPU refers to it for both

program instructions and data

• Secondary storage

 Long-term storage 

stored on external

medium, such as a disk

The CPU and Memory

• CPU cannot process data from disk or  input device ‰

1. It must first reside in memory

2. Control unit retrieves data from disk and  moves it into memory

• Items sent to ALU for processing

1. Control unit sends items to ALU, then sends  back to memory after processing

• Data and instructions held in memory until  sent to an output or storage device or program is  shut down.