GCSE OCR Computer Science - 1.1 Systems Architecture

What is the CPU?
The CPU is the 'brains' of the computer - it processes all of the data and instructions to make the CPU work.
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What is Von Neumann Architecture?
Von Neumann Architecture describes a system where the CPU runs programs stored in memory. Programs consists of instructions and data which are stored in memory addresses.
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How many main parts does a CPU have?
3
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What are the main parts of the CPU?
ALU,CU,Cache.
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What is the ALU?
Performs all decisions for the computer in the form of calculations\arithmetics.
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What is the CU?
It fetch-decodes-executes data.
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What is cache?
Temporary high speed memory, which contains frequently used instructions.
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What happens if the cache increases?
A larger CPU cache gives the CPU faster access to more data.
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What are cores?
Miniture parts of the CPU, each contain an ALU and CU.
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What happens if the cores increases?
The more instructions carried out at once.
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What is clock-speed?
The number of fetch-decode-execute cycles carried out per second.
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What happens if the clock-speed increases?
The greater the number of instructions it can carry at once.
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What are the 5 registers?
MAR,MDR,PC,CIR and Accumulator.
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What is the System Bus?
Data is moved around a system on a bus. A bus is a set of wires laid down on a printed circuit board.
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Define MAR
It holds the address location in memory of the piece of data to be fetched or stored.
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Define MDR
It holds the actual data or program instruction that has been fetched from the memory and is held temporarily.
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Define PC
It holds the memory address of the next instruction to be processed
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Define CIR
It holds the current instruction to be executed which has been fetched from memory and held in MDR.
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Define Accumulator
General purpose register which stores the results of calculations carried out.
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What is Data bus?
This carries the actual data around. Each wire or track carries a single bit digit.
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What is Address bus?
Carries information on where the data needs to go or come from.
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What is Control bus?
This carries signals around the system to control various components.
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Define Embedded System
Computers built into other larger devices that are dedicated to a single task.
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Examples of Embedded System?
Washing machine ,GPS,TV,Microwaves
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Other cards in this set

Card 2

Front

What is Von Neumann Architecture?

Back

Von Neumann Architecture describes a system where the CPU runs programs stored in memory. Programs consists of instructions and data which are stored in memory addresses.

Card 3

Front

How many main parts does a CPU have?

Back

Preview of the front of card 3

Card 4

Front

What are the main parts of the CPU?

Back

Preview of the front of card 4

Card 5

Front

What is the ALU?

Back

Preview of the front of card 5
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