CO1 WEEK 5 FDE CYCLE

Question 1

What are the three parts of the FDE cycle?

Answer 1

Fetch-instruction fetched from memory
Decode- the cpu decodes the instruction and prepares other areas of chip
Execute- preforms the instructions

Question 2

What is the FDE cycle?

Answer 2

PC->MAR-address of instruction executed
(held in PC)is copied to MAR
Memory address->MDR - instruction held at that address is placed in MDR
PC-Increments by 1
- MDR->CIR - Contents of MDR copied to CIR frees up MDRSon Execute phase
-CIR decode and execute - Instruction in CIR is decoded and then executed