systems architecture

What does the fetch do

fetches instructions from memory

what does decode do

decodes instructions so that the computer can understand it

what does the execute do

performs the instruction

how can execute perform an instruction

adding numbers together

retrieving data from memory

what are the 4 componments within the CPU

ALU,CU, cache, registers

What is the ALU

carries out arithmetic calculations and logical operations

What is the CU

sends control signals around the CPU

What does the cache do

high speed memory that stores frequently accessed instructions

what does the registers do

small piece of memory inside the processor that can store one instruction or adress

What are the 4 registers

MAR,MDR,PC and the accumulator

What does the MAR do

stores the adress of the instuction or data to be fetched from

What does the MDR do

stores the data that has been fetched from memory

What does the PC do

holds the adress of the next instruction to run

What does the Accumulator do

stores the results of the calculations performed by the ALU

How does cache size affect CPU performance

more cache= more frequently used instructions can be stored

How does the Clock speed affect CPU performance

faster clock speed = more instructions can be fetched and executed per second

How does the number of cores affect CPU performance

more cores= ability to perform more instuctions at the same time

What is an embedded system

computer system with a single function, inside a larger mechanical unit

give an example of an embedded system

washing machine

traffic lights

microwaves

properties of an embedded systme

low power consumption

low in price

small size

what would something be an embedded system

has it own hardware

has a specific purpose

built into a larger device