1.1 system architecture

1.1 system architecture

1. Cpu

   • Central processing unit
   • Cache is used between CPU and Ram to increase speed and reduce bottleneck

2. Devices

   • Input
     • Hardware which sends a signal to a computer
   • Output
     • Hardware which shows information from a computer
   • Storage
     • Hardware which saves data on a computer

3. System

   • Embedded
     • Computer systems built for a specific task
   • General purpose
     • Computer systems built to complete multiple tasks

4. Fetch Decode Execute cycle

   • Before fetching
     • Program instructions copied from storage (hard drive, DVD etc) to the RAM
   • During Fetch stage
     • instructions are moved from the RAM to the CPU

5. Register/ parts

   • MDR
     • Memory Data register
   • MAR
     • Memory address register
   • CU
     • Control unit
     • Clock
       • For each clock pulse, an instruction is carried out
       • Higher clock speed
         • The CPU would carry out more instructions in a given time
   • ALU
     • Arithmetic and logic unit