1.1 - System Architecture - CPU [OCR] [GCSE]

Name the 3 operations of the CPU

• Fetch Decode Execute
• Find Read Do
• Execute Read Repeat
• Fetch Read Execute

The Von Neumann architecture is when...

• Memory is divided into 3 parts, Fetch Decode and Execute
• Programs and Data are stored in the same memory
• Binary and Hex share the same memory
• Binary is used to store images

The CPU is split into 2 main parts...

• ALU and Controller
• CPU and ALU
• Control Unit and ALU
• Control Unit and MDR

The arithmatic Logic unit is where…

• Actual Calculations are carried out
• Data is processed
• Data is read to and written from
• RAM is emptied

The control unit...

• Coordinates all the activities taking place in the CPU
• Carried out calculations
• Empties RAM
• Reads and Writes Data

What is the purpose of the MAR

• Holds the data fetched from memory
• Holds the result of any equations carried out by the ALU
• Holds the memory address of the next instruction to be fetched from memory
• Holds the address of the instruction being fetched

What is the purpose of the MDR

• Holds the data fetched from memory
• Holds the result of any equations carried out by the ALU
• Holds the memory address of the next instruction to be fetched from memory
• Holds the address of the instruction being fetched

What is the purpose of the Accumulator

• Holds the data fetched from memory
• Holds the result of any equations carried out by the ALU
• Holds the memory address of the next instruction to be fetched from memory
• Holds the address of the instruction being fetched

What is the purpose of the Program

• Holds the data fetched from memory
• Holds the result of any equations carried out by the ALU
• Holds the memory address of the next instruction to be fetched from memory
• Holds the address of the instruction being fetched

What is a register on the CPU

• A super Fast Memory location
• A piece of RAM
• Software in control of input and Output
• Hardware in control of Input and output