Static information storage and retrieval – Hardware for storage elements
Patent
1993-02-17
1995-01-17
Popek, Joseph A.
Static information storage and retrieval
Hardware for storage elements
365201, 36518901, 235492, G11C 500, G11C 2900
Patent
active
053831470
ABSTRACT:
An IC card includes a plurality of memory ICs, each of the memory ICs having a data memory portion for storing data and an ID code memory portion in which are stored an ID code and a number of memory ICs mounted on the IC card; an address line and a data line connected to each of the plurality of memory ICs; and an address decoder for selecting one of the plurality of memory ICs according to an address signal on the address line. A method of checking the memory capacity of an IC card includes storing, in each of a plurality of memory ICs mounted on the IC card, an ID code of the memory IC and the number of memory ICs mounted on the IC card; reading out the ID code and the number of memory ICs mounted from any of said plurality of memory ICs; determining the capacity of the single memory IC from the read out ID code; and calculating the memory capacity of the entire IC card by multiplying the determined capacity of the memory IC by the number of the memory ICs mounted on the IC card.
REFERENCES:
patent: 4419747 (1983-12-01), Jordan
patent: 4916662 (1990-04-01), Mizuta
patent: 5025415 (1991-06-01), Masuyama et al.
Mitsubishi Denki & Kabushiki Kaisha
Popek Joseph A.
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