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)
1 of 13
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
2 of 13
What does the MDR do?
Memory Data Register holds DATA being sent to or fetched from RAM.
3 of 13
What does the PC do?
Program Counter points to the memory address of the NEXT instruction to be executed.
4 of 13
What does the accumulator do?
It holds the results of calculations in the ALU
5 of 13
What does the ALU do?
Part of the CPU that carries out arithmetic calculations (+/- etc) and logical operations (AND, OR, GT, LT)
6 of 13
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).
7 of 13
What does the cache do?
Small, very fast memory on the processor chip, holds commonly used instructions and data, faster than RAM.
8 of 13
What is the fetch-decode-execute cycle?
*INSERT*
9 of 13
How does clock speed affect performance?
The faster the clock, the more instructions per second executed by CPU
10 of 13
How does cache size affect performance?
The larger the cache size the more space for common instructions rather than going to slower RAM.
11 of 13
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
12 of 13
What is an embedded system?
It is a computer system (hardware and software) inside a dedicated device e.g. a microwave or elevator
13 of 13

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
View more cards

Comments

No comments have yet been made

Similar Computing resources:

See all Computing resources »See all Computer systems resources »