Unit 1.1 system architecture

Unit 1.1 system architecture

1. Topologys

2. CPU

   • Registers
     • this is a easily accesable place for CPU's to use for fast storage.
   • Control Unit
     • The control unit is a component of a computer's central processing unit (CPU) that directs the operation of the processor. It tells the computer's memory, arithmetic/logic unit and input and output devices on how to respond to a program's instructions.
   • clock speed
     • this is how fast the CPU fetches and executes data.
   • Cores
     • these allow the CPU to execute twice as many or four times as many as just one core. the more cores you have the quicker our CPU can fetch and execute
   • • FDE cycle
       • Fetch
         • The first step the fetch-execute cycle carries out is fetching the instruction. The CPU fetches this from the main memory (the hard drive) and stores it in the CPU temporary memory, the immediate access store (the registers).
       • Decode
         • The processor will then decode the instruction so it can be executed.
       • Execute
         • When the instruction has been decoded, the CPU can carry out the action that is needed. This is called executing the instruction. The CPU is designed to understand a set of instructions - the instruction set.
       • The basic operation of a computer is called the ‘fetch-execute’ cycle. The computer fetches the instruction from its memory and then executes it. This is done repeatedly from when the computer is booted up to when it is shut down.
   • Cache
     • increasing the cache size will decrease the number of memory to disk transfers which will speed up processing speeds

3. Embedded systems

   • An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with real-time computing constraints. It is embedded as part of a complete device often including hardware and mechanical parts. Embedded systems control many devices in common use today.
   • ATM
   • Cell Phone
   • XBOX
   • washing machine

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