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容错式冗余多微计算机系统是提高整个系统可靠性的重要途径。在要求高度可靠的用途中,用三个或五个微计算机执行相同的任务,其输出结果,通过一个投票表决器进行服从多数的表次。显然,表决器本身的可靠性在系统中是一个关键问题。传统的方法是用逻辑电路构成表决器,如用我国现有的中小规模集成电路,结构复杂,本身可靠性不高;如用大规模集成电路定做,则制造困难而且昴贵,设计制造周期也很长。本文提出用可编程唯读存贮器(EPROM),用编程方法设计表决器,结构大为简化,经济灵活,可靠性高,有一定实用价值。
Fault-tolerant redundant multi-microcomputer system is an important way to improve the reliability of the entire system. In applications that require a high degree of reliability, the same tasks are performed on three or five microcomputers, the output of which is passed through a voting machine for the majority table. Obviously, the reliability of the voting machine itself is a key issue in the system. The traditional method is to use a logic circuit to form a voting device, such as the use of existing small and medium-scale integrated circuits in our country, the structure is complex, its own reliability is not high; such as the use of large-scale integrated circuit customization, the manufacturing is difficult and expensive, design and manufacturing cycle very long. In this paper, a programmable ROM (Programmable Read Only Memory) is proposed to design the voter by programming method. Its structure is simplified, its economy is flexible, its reliability is high and it has some practical value.