FDE Flashcards
1
Q
fetch phase
A
Address from the PC is copied to the MAR
* Instruction held at that address is copied to MDR by the data bus
* Simultaneously, the contents of the PC are increased by 1
* The value held in the MDR is copied to the CIR
2
Q
decode phase
A
The contents of CIR are split into operand and opcode
3
Q
execute phase
A
The decoded instruction is executed
