Memory card

Details Memory card Memory card

1994-09-29

1996-04-02

Nelms, David C.

Static information storage and retrieval

Floating gate

Data security

365900, 365218, 365236, 235492, 235380, G11C 702, G06K 500

Patent

active

055047017

ABSTRACT:
A memory card of the present invention serves as a reusable prepaid card. In the memory card, prepaid-money data is stored in a user memory constituted of a flash erase type EEPROM, and decreased as the card is used. When the prepaid-money data becomes zero, the user memory is initialized for reuse. The memory card includes an EPROM to which data of a predetermined number of times of initialization is preset and which decreases in data of the number of times of initialization and an initialization control logic for executing initialization in response to an initialization command until data of the EPROM becomes zero, and inhibiting the initialization even though the initialization command is input when the data becomes zero.

REFERENCES:
patent: 5264689 (1993-11-01), Maes et al.
patent: 5285415 (1994-02-01), Depret et al.

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