system architecture

Question 1

components inside the cpu

Answer 1

Alu
CU
cache
registers

Question 2

name the different registers

Answer 2

accumulator
memory address register
program counter
memory data register

Question 3

what does alu do

Answer 3

performs calculations and logical decisions

Question 4

what does cu/control unit do

Answer 4

sends signals to control how data moves around the cpu

Question 5

what does cache do

Answer 5

provides fast access to frequently used instructions and data

Question 6

what does the register program counter do

Answer 6

holds the address of the next instruction to be executed in memory

Question 7

memory address register

Answer 7

holds the address of where data is to be fetched or stored

Question 8

memory data register

Answer 8

holds the data fetched from memory or about to be written to memory

Question 9

accumlator

Answer 9

holds the results of calculations

Question 10

fetch execute cycle in detail

Answer 10

fetch-the program counter is checked as it holds the address of the next instruction to be executed. this address is used by memory address register in order to fetch the instruction needed from main memory and bring it into memory data register. the address in the program counter is incremented to point at the next instruction.
decode-now the instruction is in the cpu the control unit decodes the instruction to see what has to be done
execute-now we know what to do we can execute the instruction