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Unformatted text preview: electrical conduits called buses. Each transfer of data between the CPU and memory is accomplished with a series of steps called a bus transaction. A read transaction transfers data from the main memory to the CPU. A write transaction transfers data from the CPU to the main memory. A bus is a collection of parallel wires that carry address, data, and control signals. Depending on the particular bus design, data and address signals can share the same set of wires, or they can use different 282 CHAPTER 6. THE MEMORY HIERARCHY sets. Also, more than two devices can share the same bus. The control wires carry signals that synchronize the transaction and identify what kind of transaction is currently being performed. For example, is this transaction of interest to the main memory, or to some other I/O device such as a disk controller? Is the transaction a read or a write? Is the information on the bus an address or a data item? Figure 6.6 shows the configuration of a typical desktop system. The main components are the CPU chip, a chipset that we will call an I/O bridge (whic...
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This note was uploaded on 09/02/2010 for the course ELECTRICAL 360 taught by Professor Schultz during the Spring '10 term at BYU.

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