How storage device communicate with processing unit of a computer?


Subject Introduction to Computer System
NU Year Set: 3.(b) Marks: 5 Year: 2013

In this model everything is connected to the same bus. When some node in the bus (like the CPU) wants to read or write something to the memory, it puts the address of the memory block to write to onto the address bus and data (if needed) to the data bus, then raises the appropriate signal on the control buslike R¯¯¯¯R¯ (read), W¯¯¯¯¯W¯ (write), enable... to inform other devices. As one noticed that the address belongs to it, it will capture the address and do the needed things, in this case getting the data out and put it on the data bus for the other node to read back.

That's how it work in general. To understand more you need to have some knowledge on digital electronics and computer architectures.

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