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    • 1. 发明授权
    • Nonvolatile memory implementation for electronic devices
    • 电子设备的非易失性存储器实现
    • US6091658A
    • 2000-07-18
    • US430897
    • 1999-11-01
    • John Robert McDonaldJohn Lowell ZellerThomas Scott Gee
    • John Robert McDonaldJohn Lowell ZellerThomas Scott Gee
    • G11C16/10G11C7/00
    • G11C16/102
    • An automobile has an electronic device with a nonvolatile memory implementation. The electronic device includes non-programmable nonvolatile memory (ROM), volatile memory (RAM) and programmable nonvolatile memory (EEPROM). A controller (CPU) is coupled to and controls reads and writes to and from the ROM, RAM, and EEPROM. When the CPU detects a key-off event it calculates an error recovery code (checksum) for a data string stored in the RAM and stores the checksum and data into one of two memory locations in the EEPROM. The CPU will alternate between the two memory locations each cycle. When the CPU detects a key-on event it calculates the checksum for the data string stored in the RAM. If the data string is invalid or if validity of the EEPROM data cannot be confirmed, then the CPU copies a predetermined data string from the ROM to the RAM. If the CPU determines that the calculated KAM checksum does not equal the stored KAM checksum, then the CPU copies the EEPROM data string to the KAM. Otherwise, the RAM data string remains untouched.
    • 汽车具有具有非易失性存储器实现的电子设备。 电子设备包括非可编程非易失性存储器(ROM),易失性存储器(RAM)和可编程非易失性存储器(EEPROM)。 控制器(CPU)耦合到并控制对ROM,RAM和EEPROM的读取和写入。 当CPU检测到关闭事件时,它计算出存储在RAM中的数据串的错误恢复码(checksum),并将校验和和数据存储在EEPROM的两个存储单元之一中。 CPU将在每个周期的两个存储单元之间交替。 当CPU检测到键入事件时,它会计算存储在RAM中的数据字符串的校验和。 如果数据串无效或EEPROM数据的有效性无法确认,则CPU将预定的数据串从ROM复制到RAM。 如果CPU确定计算的KAM校验和不等于存储的KAM校验和,则CPU将EEPROM数据字符串复制到KAM。 否则,RAM数据串保持不变。