Systems Architecture

Von Nuemann
1. Uses a single processor
2. Uses 1 memory for both instructions and data
3. Executes programs following the fetch, decode, execute cycle
4. Based off the stored- program computer concept, where instructions data and program data are stored in the same memory
5. This concept is still used today
Control Unit (CU)
1. It lets the computers logic unit, memory, as well as both input and output devices Know how to respond to instructions.
2. Coordinates the CPU
Arithmetic Logic Unit (ALU)
1. Works out all the calculations
2. Modern CPUs contain very powerful ALUs
Registers
1. Current Instruction Register (CIR)
  1. Holds the instruction the has just been fetched
2. Memory Address Register (MAR)
  1. Holds the address of data that needs to be accessed
3. Memory Data Register (MDR)
  1. Holds the data for the next instruction to be decoded
4. Accumalater (ACC)
  1. Holds all the ALU data

Resource summary

	Created by Emma Worman over 5 years ago