IC card with decoder for selective control for memory storage

Details IC card with decoder for selective control for memory storage IC card with decoder for selective control for memory storage

1993-08-04

1995-01-17

Heyman, John S.

Static information storage and retrieval

Addressing

Particular decoder or driver circuit

365228, 36518905, G11C 800

Patent

active

053831616

ABSTRACT:
An IC card includes a first semiconductor memory, such as a 256K bit RAM, for storing main data; a second semiconductor memory, such as a 64K bit EEPROM, for storing physical information concerning the IC card, e.g., size, capacity, and access time; a control circuit for selectively enabling operation of the first and second semiconductor memories; an address BUS connected to the first and second semiconductor memories; a data BUS connected to the first and second semiconductor memories; and a decoder connected to the address BUS and the second semiconductor memory for decoding a write control signal for the second semiconductor memory using part of an address signal from the address BUS and delivering a decoded write control signal to the second semiconductor memory to control storing of data in the second semiconductor memory. Consequently, the area in the second semiconductor memory is divided into a non-writable region which does not permit overwriting of stored data and a writable region which permits overwriting of stored data.

REFERENCES:
patent: 4910774 (1990-03-01), Barakat
patent: 4928001 (1990-05-01), Masada
patent: 4931997 (1990-06-01), Mitsuishi et al.
patent: 5058074 (1991-10-01), Sakamoto

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