Chapter 2 Organization of Computers 2.1.1 System Buses Data is transferred via the data bus. When the CPU fetches data from memory. it first outputs the memory address on its address bus. Then memory outputs the data onto the data bus: the CPu can then read the data from the data bus. When writing data to memory. the CPu first outputs the address onto the address bus, then outputs the data onto the data bus Memory then reads and stores the data at the proper location. The processes for reading data from and writing data to the 1/O devices are similar 数据是通过数据总线传送的。当CPU从存储器中取数据时,它首先把存储器 地址输出到地址总线上,然后存储器将数据输出到数据总线上,这样CPU就 可以从数据总线上读取数据了。当CPU向存储器中写数据时,它首先将地址 输出到地址总线上,然后把数据输出到数据总线上,这样存储器就可以从数 据总线上读取数据并将它存储到正确的单元中。对O设备读写数据的过程 与此类似。 计算机专业英语 2-9Chapter 2 Organization of Computers 计算机专业英语 2-9 Data is transferred via the data bus. When the CPU fetches data from memory, it first outputs the memory address on its address bus. Then memory outputs the data onto the data bus; the CPU can then read the data from the data bus. When writing data to memory, the CPU first outputs the address onto the address bus, then outputs the data onto the data bus. Memory then reads and stores the data at the proper location. The processes for reading data from and writing data to the I/O devices are similar. 数据是通过数据总线传送的。当CPU从存储器中取数据时，它首先把存储器 地址输出到地址总线上，然后存储器将数据输出到数据总线上，这样CPU就 可以从数据总线上读取数据了。当CPU向存储器中写数据时，它首先将地址 输出到地址总线上，然后把数据输出到数据总线上，这样存储器就可以从数 据总线上读取数据并将它存储到正确的单元中。对I/O设备读写数据的过程 与此类似。 2.1.1 System Buses