1.3.3

Von Neumann Architecture

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Von Neumann Architecture

All modern Central Processing Units (CPUs) are based on the Von Neumann architecture. The components of this architecture are:

Arithmetic and Logic Unit (ALU)

Arithmetic and Logic Unit (ALU)

  • The ALU performs all of the arithmetic and logical operations of the CPU, including:
    • Addition and subtraction, multiplication and division.
    • Comparisons such as whether numbers are equal or if one is greater than another.
    • Boolean operations such as AND, OR and NOT.
Control Unit (CU)

Control Unit (CU)

  • Sends out control signals to other parts of the CPU.
  • Executes program instructions by following the fetch-decode-execute cycle.
  • Made up of two key parts:
    • The clock - coordinates the CPU's activity.
    • The decoder - decodes program instructions.
Registers

Registers

  • Registers are tiny amounts of super-quick memory within the CPU.
    • Used to hold information needed for the CPU to work.
    • Each register holds a specific piece of information.

Registers of the Central Processing Unit (CPU)

Registers that have a predetermined purpose in the central processing unit are known as special purpose registers.

Program Counter (PC)

Program Counter (PC)

  • Holds the memory location address of the next instruction to be performed by the CPU.
Accumulator (ACC)

Accumulator (ACC)

  • Holds the result of calculations and operations performed by the arithmetic logic unit (ALU).
Memory Address Register (MAR)

Memory Address Register (MAR)

  • Holds the address of the location in memory where data is to be retrieved or stored.
Memory Data Register (MDR)

Memory Data Register (MDR)

  • Holds the data that has been retrieved from memory, or that is about to be stored in memory.
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1

Computer Systems

1.1

Data Representation

1.1.1Binary Numbers1.1.2Negative Binary Numbers1.1.3Hexadecimal1.1.4Using Hexadecimal1.1.5Converting Binary & Hexadecimal1.1.6Converting Denary & Hexadecimal1.1.7Capacity1.1.8Calculating Capacity Requirements1.1.9Binary in Computer Systems1.1.10Data Compression1.1.11Run Length Encoding1.1.12File Formats
1.2

Data Transmission

1.2.1Packet Switching1.2.2Data Transmission1.2.3Universal Serial Bus (USB)1.2.4Parity Check1.2.5Checksum & Echo Checks1.2.6Encryption
1.3

Hardware

1.3.1Elements of Computer Systems1.3.2Types of Computer System1.3.3Von Neumann Architecture1.3.4The Fetch, Decode, Execute Cycle1.3.5Factors Affecting CPU Performance1.3.6Computational Logic1.3.7Input Devices1.3.82D & 3D Scanners1.3.9Code Readers1.3.10Solid State Storage1.3.11Magnetic Storage1.3.12Examples of Magnetic Storage1.3.13Optical Storage1.3.14Examples of Optical Storage1.3.15Types of Optical disk1.3.16Storage Requirements1.3.17Translation - Compilers1.3.18Translation - Interpreters1.3.19Translation - Assemblers1.3.20Acoustic Sensors1.3.21Flow Sensors1.3.22Gas Sensors1.3.23Humidity Sensors1.3.24Infrared Sensors1.3.25Level Sensors1.3.26Light Sensors1.3.27Magnetic Field Sensors1.3.28Moisture Sensors1.3.29pH Sensors1.3.30Pressure Sensors1.3.31Proximity Sensors1.3.32Temperature Sensors1.3.33Network Hardware
1.4

Software

1.4.1Operating Systems1.4.2Interrupts1.4.3High-Level Languages1.4.4Low-Level Languages
1.5

The Internet & its Uses

1.5.1The Internet1.5.2Uniform Resource Locators (URLs)1.5.3DNS1.5.4HTML1.5.5Cookies1.5.6Web Hosting1.5.7Digital Currency
1.6

Cyber Security

1.6.1Forms of Attack1.6.2Penetration Testing1.6.3Types of Malware1.6.4How Malware Spreads1.6.5Protecting Against Malware1.6.6Information Security1.6.7Structured Query Language (SQL) Injection1.6.8Firewalls1.6.9Authentication: User Access Levels1.6.10Authentication: Passwords1.6.11Social Engineering1.6.12Phishing1.6.13Denial of Service Attacks
1.7

Automated & Emerging Technologies

1.7.1Automated Systems1.7.2Robotics1.7.3Artificial Intelligence
2

Algorithms, Programming & Logic

2.1

Algorithm Design & Problem Solving

2.1.1Computational Thinking - Abstraction2.1.2Computational Thinking - Decomposition2.1.3Computational Thinking - Algorithmic Thinking2.1.4Pseudocode2.1.5Flow Diagrams2.1.6Interpreting, Correcting & Completing Algorithm2.1.7Correcting Algorithms2.1.8Completing Algorithms2.1.9Testing2.1.10Types of Testing2.1.11Test Plans2.1.12Validation & Sanitation2.1.13Authentication & Contingencies
2.2

Programming

2.2.1Programming Fundamentals - Variables & Constants2.2.2Programming Fundamentals - Comments2.2.3Programming Fundamentals - Input & Output2.2.4Data Types2.2.5Casting2.2.6Controlling Program Flow - Sequence2.2.7Controlling Program Flow - Selection2.2.8Controlling Program Flow - Iteration2.2.9Modularity - Subroutines2.2.10Modularity - Scope2.2.11Arrays
2.3

Databases

2.3.1Structuring Data - Records2.3.2Structuring Data - Databases2.3.3SQL
2.4

Boolean Logic

2.4.1Binary Systems2.4.2Logic Circuits2.4.3Truth Tables2.4.4Evaluating Expressions2.4.5Boolean Operators2.4.6End of Topic Test - Logic

Practice questions on Von Neumann Architecture

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    This is the common architecture for what feature of computers?Multiple choice
  2. 2
    Modern CPUs are based on the Von Neumann architecture. What does CPU stand for?Multiple choice
  3. 3
    Which of the following are components of the Von Neumann architecture?True / false
  4. 4
    Which of the following are examples of Boolean operators?True / false
  5. 5
    What is the purpose of the program counter?Multiple choice
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Types of Computer System

The Fetch, Decode, Execute Cycle