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本文在论及了总线主设备、从设备、总线操作周期等总线术语概念的基础上提出了当前最广泛流行的 ISA 总线延伸和扩展时的实际技术问题,给出了ISA 总线中输出、输入总线信号的实际延伸和扩展电路;详细论述了主机板CPU 和 DMA 控制器以及 I/O 插接板上 CPU 和 DMA 控制器等主设备分别占有 ISA 总线信号时的时序,总线信号方向控制的实际电路;最后叙述了延伸总线信号时的抗干扰措施。
Based on the conception of bus terminology such as bus master, slaves and bus operation cycle, this paper presents the actual technical problems in extending and expanding the most widely used ISA bus at present, and presents the output and input bus in ISA bus The actual extension and expansion of the signal circuit; detailed discussion of the motherboard CPU and DMA controller and the I / O board on the motherboard and DMA controller, respectively, when the ISA bus master signal timing, the actual direction of the bus signal control circuit Finally, it describes the anti-interference measures when extending the bus signal.