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Recall from Chapter 9 that memory systems use the fetch-store paradigm in whicha processor can either fetch (i.e., read) a value from memory, or store (i.e., write) avalue to memory. A bus uses the same basic paradigm. That is, a bus only supportsfetch and store operations. As unlikely as it seems, we will learn that when a processorcommunicates with a device or transfers data across a bus, the communication alwaysuses fetch or store operations.The point is:Like a memory system, a bus employs the fetch-store paradigm; allcontrol or data transfer operations are performed as either a fetch ora store.
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