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System Architecture and Memory
Descripción
GCSE Computing Mapa Mental sobre System Architecture and Memory, creado por Hannah Heathcock el 30/03/2021.
Sin etiquetas
computer science
system architecture
memory
computing
gcse
Mapa Mental por
Hannah Heathcock
, actualizado hace más de 1 año
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Creado por
Hannah Heathcock
hace más de 3 años
19
0
0
Resumen del Recurso
System Architecture and Memory
CPU
Performance
Clock speed
No of cycles per second
Measured in Hertz (Hz)
No of cores
Cache size
Cache
Stores instructions from the CPU
3x levels
Level 1
Fastest access
Smallest
Level 2
Slower
Bigger
Level 3
Slowest
Biggest
Fetch, decode, execute
Von Neumann
Control Unit
Controls flow of data
Decodes instructions
Arithmetic Logic Unit (ALU)
Carries out calculations and logical decisions within the CPU
Accumulator (ACC)
Stores results of ALU calculations
Logical internal structure
Data and programs both stored in the same place
Registers
Tiny amounts of high speed memory within the CPU
Each holds a specific piece of information
They hold the information needed for the CPU to work
Memory
Primary storage
Data currently in use
ROM
Read Only Memory
Can only read, cannot write to
Stores boot up instructions
Non volatile
RAM
Random Access Memory
Can read and write to
Volatile
Temporary data from running programs and files
Virtual memory
Special type of RAM
On the hard drive
Used when RAM is full
Flash memory
Special type of non volatile RAM
Secondary storage
Non volatile
Used to store files and programs
Magnetic
Solid state
Optical
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