Chapter 2 Organization of Computers 2.1.1 System Buses A system may have a hierarchy of buses. For example, it may use its address, data, and control buses to access memory, and an 1/O controller. The I/O controller, in turn, may access all I/o devices using a second bus. often called an l/o bus or a local bus 个系统可能具有分层次的总线。例如,它可能使用地址、数 据和控制总线来访问存储器和JO控制器。IO控制器可能依次 使用第二级总线来访问所有的O设备,第二级总线通常称为 IO总线或者局部总线。 计算机专业英语 211Chapter 2 Organization of Computers 计算机专业英语 2-11 A system may have a hierarchy of buses. For example, it may use its address, data, and control buses to access memory, and an I/O controller. The I/O controller, in turn, may access all I/O devices using a second bus, often called an I/O bus or a local bus. 一个系统可能具有分层次的总线。例如，它可能使用地址、数 据和控制总线来访问存储器和I/O控制器。I/O控制器可能依次 使用第二级总线来访问所有的I/O设备，第二级总线通常称为 I/O总线或者局部总线。 2.1.1 System Buses