Flashcards
AO2 Computer science
Cards in this deck (19)
- 1Embedded systemscomputers (dedicated systems) built into other devices e.g. dishwashers.
- 2Embedded systems - control systemsmonitor & control machinery in order to achieve a desired result e.g. dishwashers system controls the water pumps and water releasing.
- 3Embedded systems-easy to design
-cheaper to produce
-more efficient as doing one task - 4Control Unitoverall control of the CPU by following FETCH-DECODE-EXECUTE cycle
- 5Control Unitcontrols the flow of data inside the CPU and outside.
- 6Program Counter (control unit)holds the memory address of the instruction for each cycle
- 7Accumulator (arithmetic & logic unit)stores intermediate results of calculations in the ALU
- 8Memory Address Registerholds the address about to be used, might be a point to DATA or INSTRUCTION.
- 9Memory Data Registerholds the DATA or INSTRUCTION, may be from memory or waiting to be written.
- 10The Arithmetic Logic UnitDoes simple addition and subtraction and can multiply and divide by repeating addition and subtract ( All the calculations.)
- 11The Arithmetic Logic UnitPerforms logic operations:-
-AND
-OR
-NOT
-BINARY SHIFTS - 12The CacheVery fast memory in the CPU
-slower than the registers
-faster than RAM
-Low capacity
Expensive (compared to RAM & secondary storage) - 13The CacheStores regularly used data so it is easily accessible, the CPU will scan through Cache than Ram.
- 14The CacheL1 - quickest - low capacity
L2 - slower - can hold more
L3 - slowest - high capacity - 15ROM - Read Only Memorynon-volatile
built onto motherboard
contains instructions to boot up - 16Virtual Memoryused when RAM is full, might be used if too many apps are open.
- 17The number of coreswhich perform the fetch, decode, execute cycle simultaneously. This means more instructions can be carried out at once, making it faster
- 18Clock speedThe greater number of instructions that can be carried out per second
- 19Random Access Memory (RAM)This is where a PC stores data before it's processed - fast & volatile
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- Flashcards on AO2 Computer science, created by keira kurylo on 20/04/2021.
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- keira kurylo
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