Memory card

Details Memory card Memory card

1993-02-03

1995-03-28

Fears, Terrell W.

Static information storage and retrieval

Addressing

365 52, 36518909, G11C 1300

Patent

active

054023858

ABSTRACT:
A function of write protection against careless writing in a memory card is realized by means other than a mechanical switch. Existing address lines exceeding the capacity of a memory and an existing write control line are used as inputs to a gate circuit so that data can be written in the memory only in the case where a specific value can be decoded. Accordingly, a write address space is limited to a specific address space other than the lowermost address space. Accordingly, data cannot be written if the specific address space cannot be known. As a result, the function of write protection can be provided without using any switch and without introducing any nonstandardized terminal and any control signal.

REFERENCES:
patent: 4727513 (1988-02-01), Clayton
Japanese Publication, Jeida, the IC Memory Card, Guideline Ver 4.1.

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