1.1 system architecture

1.1 system architecture

1. summarys

   • program counters (PC)
     • stores the location of the next instruction in a program waiting to be fetched
   • memory address register (MAR)
     • stores the location for data to be fetched from or sent to memory
   • memory data register (MDR)
     • stores the data that has been fetched from or is waiting to be sent to memory
   • current instruction register
     • stores the instruction ready to be decoded by the alu

2. more summarys

   • arithmetic logic unit (ALU)
     • part of a (CPU) carries out arithmetic and logic operations in a computer instructions
   • control unit (CU)
     • works with the cpu to control the flow of data within the system and to decode instructions
   • cashe
     • small temporary volatile memory, stories frequently used instructions. quicker for CPU to access than main memory
   • main memory (RAM)
     • this the volatile memory that stores data and programs that currently in use

3. factors affecting the preformance of a CPU

4. types of systems

   • embedded systems
     • they are dedicated systems that are designed systems that are designed for a fixed purpose. they are a system within a larger system
     • eg. washing machines, car park barriers, microwaves, car engines, MP3 ect
   • general purpose system
   • control system

5. how CPUs process instructions