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1. 发明授权

US4484307A Electronic postage meter having improved security and fault tolerance features 失效
标题翻译：电子邮资计算机具有改进的安全性和容错特性
公开(公告)号：US4484307A
公开(公告)日：1984-11-20
申请号：US349285
申请日：1982-02-16
申请人： Jesse T. Quatse , Donald E. Dodge, Jr. , Richard K. Dove
发明人： Jesse T. Quatse , Donald E. Dodge, Jr. , Richard K. Dove
IPC分类号： G06F11/14 , G06F11/20 , G07B17/00 , G06F15/20
CPC分类号： G07B17/00314 , G06F11/006 , G06F11/1441 , G07B2017/00338 , G07B2017/00346
摘要： A microcomputerized postage meter that provides high degrees of security and fault tolerance. The meter maintains data security under low power conditions by the use of functionally nonvolatile memory units. Register and other data which must survive normal and abnormal losses of power to the meter electronics are stored in dual redundant battery augmented memories (hereinafter designated BAMs). Upon detecting an error condition, the microcomputer writes an appropriate fault code to the BAMs. A mechanism for disabling the meter includes dual redundant flip-flops which are set to a "faulted" state upon detection by the microcomputer of a failure condition. These flip-flops are powered by the BAM batteries. They cannot be reset except by physical access to the meter interior, which access is only available to authorized personnel at the factory. The fault flip-flops are also set when the microcomputer fails to properly execute its own operating program. Once the meter has been set to a "faulted" state, the fault flip-flops hold two signals, MPCLR ans SYSCLR, true. The BAM contents may still be read out independently of the microcomputer which is prevented from accessing the BAMs. This is accomplished by allowing power necessary to read the BAMs to be supplied to the BAMs without supplying power to the microcomputer. Moreover, even if the microcomputer is powered, MPCLR prevents it from executing instructions and SYSCLR isolates it.
摘要翻译：一种提供高度安全性和容错能力的微电脑邮资计费器。该仪表通过使用功能非易失性存储单元在低功耗条件下维护数据安全性。寄存器和其他数据必须能够保持正常和异常的功率损失到仪表电子设备存储在双冗余电池增强存储器（以下称为BAM）中。在检测到错误状况时，微机向BAM写入适当的故障代码。用于禁用仪表的机构包括双重冗余触发器，其在由微型计算机检测到故障状态时被设置为“故障”状态。这些触发器由BAM电池供电。除了通过物理访问仪表内部之外，它们不能复位，只能在工厂授权的人员进行访问。当微型计算机无法正确执行自己的操作程序时，也会设置故障触发器。一旦仪表已经设置为“故障”状态，故障触发器将保持两个信号，MPCLR和SYSCLR为真。仍然可以独立于无法访问BAM的微型计算机读出BAM内容。这是通过允许在不向微型计算机供电的情况下读取提供给BAM的BAM所需的电力来实现的。此外，即使微电脑供电，MPCLR阻止它执行指令，SYSCLR将其隔离。

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