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Computing 1 > CPU > Flashcards

CPU Flashcards

1
Q

what is the purpose of the CPU

A

process data and instructions

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2
Q

what are the 4 parts of the CPU

A

Control Unit
ALU
Cache
Registers

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3
Q

what is the purpose of the control unit

A

manages the flow of data around the CPU, and makes sure data is fetched, decoded and executed

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4
Q

what is the purpose of the ALU

A

performs all the logical calculations

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5
Q

what is the cache and what is its purpose

A

is a section of highspeed memory in the eCPU and it holds regularly used data

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6
Q

why is the cache needed

A

it increases performance as it lowers the number of times the CPU has to go to the RAM which is slower as it is farther away and slower

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7
Q

what are the 4 registers

A

MAR
MDR
PC
Accumalator

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8
Q

what is von Neumann architecture (2 CONCEPTS)

A
  • runs programs that are stored in the memory
  • programs consist of instructions and data that are stored in the memory
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9
Q

what does MAR stand for and what is its purpose

A

Memory address register - holds the address of the next piece of data

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10
Q

what does PC stand for and what is its purpose

A

program counter - holds the address of the next instruction

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11
Q

what does MDR stand for and what is its purpose

A

holds the actual data.instruction stored in the MAR

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12
Q

what is the purpose of the accumulator

A

holds the result of the calculation from ALU

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13
Q

what is a register

A

a section of high-speed memory in the CPU

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14
Q

what does the FDE cycle stand for

A

fetch decode execute

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15
Q

what 3 factors affect CPU performance

A

clock speed
number of cores
cache size

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16
Q

what is clock speed

A

the number of instructions that can be carried out per second

17
Q

what is clock speed measured in

A

Hertz

18
Q

how does clock speed affect CPU performance?

A

the higher the clock speed the more instructions that can be carried out per second so that more FDE cycles can be done at the same time

19
Q

how does the number of cores in a computer affect the CPU performance?

A

each core in a CPU can process data independently from each other so the more cores the more instructions can be carried out at once

Computing 1 (8 decks)

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