Patent ID: 11923017
Assignee: ROHM CO., LTD.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 13:
14. A non-volatile storage device comprising:
a memory configured to store data in a non-volatile manner;
a power supply configured to generate an internal voltage to feed the internal voltage to the memory;
a controller configured to control the memory and the power supply;
an A/D converter configured to perform A/D conversion on the internal voltage;
a fault detector configured to detect a fault related to data written in the memory based on an output of the A/D converter;
a storage configured to store data read from the memory under a first condition; and
a flag output circuit configured to output a predetermined flag,
wherein:
the fault detector is configured such that it compares, with data stored in the storage, data read from the memory under second conditions where logical values of data are more difficult to determine than under the first condition, and, when the output of the A/D converter under, of the second conditions that cause comparison to result in disagreement, the condition where the logical values of data are easiest to determine exceeds a predetermined range, the fault detector detects a second fault as another type of the fault, and
the flag output circuit is configured such that, when the fault detector detects the second fault, the flag output circuit outputs the predetermined flag.