Software for controlling a reliable backup memory

Details Software for controlling a reliable backup memory Software for controlling a reliable backup memory

1996-08-29

1998-04-14

Canney, Vincent P.

Excavating

371 251, G06F 1100

Patent

active

057401780

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.

REFERENCES:
patent: 5146459 (1992-09-01), Shimizu
patent: 5181206 (1993-01-01), Hashiguchi
patent: 5349697 (1994-09-01), Pelkonen

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