Read / Write / TAM

Fetch Execute Cycle

1. CU tells the MAR the location to be accessed
2. activate the Read line on the Control Bus
3. copy of the data from address is released onto data bus
4. copied into the MDR
5. Decode and execute instruction

Read Cycle Steps
1. Control Unit sets up the Memory Address Register with the required memory address
2. Control Unit activates the read line on the Control Bus
3. storage location info are relased onto the Databus
4. data is then copied into the Memory Data Register

Write Cycle Steps
1. Control Unit sets up the Memory Address Register with the required memory address
2. Control Unit gives Memory Data Register the data to be written
3. Control Unit activates the Write Line
4. Contents are transferred to the storage location in memory by the Data Bus