Computing - System Architecture 1.1

  • Created by: MaxR1
  • Created on: 31-05-18 16:14
What is the purpose of the CPU?
It processes instructions and data. The CPU has a "Clock speed", measured in Hz. The clock governs how many instructions per second can be processed (executed)
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What does the MAR do?
Memory Address Register hold the ADDRESS in RAM of an instruction or data to be fetched from or stored in RAM
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What does the MDR do?
Memory Data Register holds DATA being sent to or fetched from RAM.
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What does the PC do?
Program Counter points to the memory address of the NEXT instruction to be executed.
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What does the accumulator do?
It holds the results of calculations in the ALU
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What does the ALU do?
Part of the CPU that carries out arithmetic calculations (+/- etc) and logical operations (AND, OR, GT, LT)
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What does the control unit do?
Control Unit Sends Control Signals to the internal components of the Computer: such as to I/O controllers (input/output), RAM (memory read/write), Hard Disk (read/write).
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What does the cache do?
Small, very fast memory on the processor chip, holds commonly used instructions and data, faster than RAM.
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What is the fetch-decode-execute cycle?
*INSERT*
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How does clock speed affect performance?
The faster the clock, the more instructions per second executed by CPU
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How does cache size affect performance?
The larger the cache size the more space for common instructions rather than going to slower RAM.
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How does the number of cores affect performance?
Processors have a core in which instructions are executed, multi-core means more than one core in the processor so quad-core means four times as many instructions per second
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What is an embedded system?
It is a computer system (hardware and software) inside a dedicated device e.g. a microwave or elevator
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Other cards in this set

Card 2

Front

What does the MAR do?

Back

Memory Address Register hold the ADDRESS in RAM of an instruction or data to be fetched from or stored in RAM

Card 3

Front

What does the MDR do?

Back

Preview of the front of card 3

Card 4

Front

What does the PC do?

Back

Preview of the front of card 4

Card 5

Front

What does the accumulator do?

Back

Preview of the front of card 5
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