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1问题的提出在计算机监控或排能仪表系统中，有些实时信息成仪器状态，不仅需要随时保存在存储器RAM中，直到这些信息或状态再发生变化，而且需要一段时期内一直保存这些信息。在这段时间里，如果电源突然断心就有可能使总线上的随机数据写入存储器RAM芯片中，造成错误的写入。
1 PROBLEM PROBLEMS In computerized monitoring or discharge instrumentation systems, some of the real-time information is in an instrument state and needs to be kept in memory RAM at any time until the information or state changes again and the information needs to be retained for a period of time. During this time, if the power is suddenly broken, it is possible to write random data on the bus into the memory RAM chip, resulting in erroneous writing.