Software for controlling a reliable backup memory
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United States of America Patent
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Apr 14, 1998
Grant Date -
N/A
app pub date -
Aug 29, 1996
filing date -
Aug 29, 1996
priority date (Note) -
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status (Latency Note)
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Abstract
An Electrically Erasable Programmable Read Only Memory (EEPROM) provides backup and initialization data for random access memory (RAM) in a control unit. In order to update the EEPROM with new releases of a program and data, the EEPROM is divided into two segments, each with a separately controllable write enable voltage. Advantageously, this allows a new release to be written into one segment of a single EEPROM without erasing the other segment until the newly written segment has been verified. The software for controlling an update of the EEPROM is stored in RAM and the software for controlling an initialization of the RAM from the EEPROM is stored in the EEPROM. Extensive checks are performed before accepting an update of the EEPROM or an initialization of the RAM.
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