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Revision By Russell Barr - Coggle Diagram
Revision
By Russell Barr
Register
- A small fast aces memory location.
MAR - memory address register. Holds any addresses about to be used by the CPU.
MDR - Memory data register. Holds the actual data or instructions.
ALU
- Arithmetic Logic Unit
Does all the calculations.
Does simple addition, subtraction and compares the size of numbers. Can do multiplication & division usinf repeated addition & subtraction.
Preforms logic operations.
Clock
Number of instructions processor core can carry out per second (Hz)
Higher the clock speed the more instructions can be carried out per second.
CPU
Control Unit
- Tells other components how to respond to instructions.
BUS
- Set of wires that moves data.
ALU
- Carries out logic and math operations.
MEMORY
- Used to store instructions for the CPU
ROM
- Read only memory.
Stores permanent instructions to tell computer how to boot.
Non Volatile - Does not loose memory when switched off.
6 - 8 MB
CACHE
- Quick access memory inside the CPU
Much faster than RAM.
A larger CPU chache gives the CPU faster access to more data.
Slower than a register.
Stores regularly used data so can be accesses quicker next time its needed.
L1 is the quickest by has lowest capacity
L2 is slower that L1 but can hold more.
L3 is the slowest but can hold the most.
RAM
- Random access memory.
Read and write
Stores instructions and data ready for the CPU to execute.
Volatile - Looses memory when switched off.
1 - 256 GB