The Student Room Group
Reply 1
Sorry I hated the Fetch Execute Cycle so really in the exam I just remembered all the steps! It's also been a year since I done it.

From Scholar: -


1. The contents of the PC are copied into the MAR;
2. The contents of memory at the location designated by the MAR are copied into the MDR;
3. The PC is incremented;
4. The contents of the MDR are copied into the IR.
5. Decode the instruction in the IR;
6. Execute the instruction in the IR.



The First Part is the Fetch the Second the Execute.

I really can't go into much detail but I can't remember if you need to remember the lines and stuff but I have a funny feeling you do. It would be good to atleast just even learn the steps because your going to be asked about it.


Also a Key to the Quote

PC - Program Counter
MAR - Memory Address Register
MDR - Memory Data Register
IR - Instruction Register
Reply 2
Eek. Why have I never heard of this?!
Reply 3
From "How to pass Higher Computing"

Fetch: This part of the cycle reads the next instruction from main memory into the processor;
1. The memory address of the next instruction is placed on the address bus.
2. A read signal is activated on the control line.
3. The data stored at the addressed memory location is placed on the data bus and transferred to a register which holds it until it is executed.

Execute:
4. The processor interprets the instruction.
5. The processor carries out the instruction.

Heh, I've learnt something new. :smile:
Reply 4
Actually, use his because thats the one I learned :P
Reply 5
Cirrus
Actually, use his because thats the one I learned :P


I'm female. :wink:
Reply 6
Hers* Slip of the tongue sorry!