1.1.1 von newman actitecture Flashcards
1
Q
what is the MAR
A
holds the memory location of data that needs to be accessed
2
Q
what is the MDR
A
Holds the instructions fetched from or to be written to the memory.
3
Q
what is a program counter
A
Holds the address of the next instruction and counts how many times the fetch part of the cycle has been carried out.
4
Q
what is the acc
A
Holds the result of the calculations
5
Q
what number does the PC start at
A
0
6
Q
how many steps is there in the von newman
A
7
7
Q
what does the PC counter doe first
A
Copy itself to the MAR
8
Q
what is step 3
A
MAR finds the location in memory
9
Q
what is step 4
A
Data from the location is copied to MDR
10
Q
what is step 5
A
The program counter adds 1
11
Q
what is step 6
A
the CPU works out the instruction needed
