7.1 概述在设计微处理机系统时,常需将较多的硬件接到系统母线上去,以便在CPU的选择和控制下相互传递信息,并防止硬件之间相互影响。要做到这点,就需使用专门的母线驱动电路。更进一步,在一个复杂的系统中,各组件,各子系统之间需彼此互连,以便相互通信。这样一种互连就需通过某种外部标准母线来实现。 7.1 Overview When designing a microprocessor system, it is often necessary to connect more hardware to the system bus to communicate with each other under the CPU’s selection and control and to prevent hardware interaction. To do this, you need to use a dedicated bus driver circuit. Further, in a complex system, components and subsystems need to be interconnected with each other to communicate with each other. Such an interconnection needs to be achieved by some kind of external standard bus.