1.1.1- FDE Cycle Flashcards
1
Q
FETCH
A
PC hold address of next instruction
PC incremented by 1
address copied to MAR
2
Q
What does the MAR do
A
Sends address to main memory
3
Q
What happens at main memory
A
It waits for a signal from the control unit
4
Q
What does the control unit do?
A
Sends read signal to main memory
5
Q
What does the mdr
A
Data is copied to CIR
Then data is copied to accumulator
6
Q
CIR
A
split into opcode and operand
Sends address to MAR
