Method of recording data in memory card having EEPROM and memory card system using the same
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United States of America Patent
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Apr 12, 1994
Grant Date -
N/A
app pub date -
Jul 5, 1991
filing date -
Sep 28, 1990
priority date (Note) -
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Abstract
A method of recording data in a memory card having an EEPROM, and a memory card system using the same are provided. A memory card has at least two collective erasure type EEPROM chips where at least one of which is conditioned for a spare memory. When an access of the kind needing overwriting is made to the memory card, data stored in memory locations of the addresses of a corresponding EEPROM chip, except for the address where overwriting is to occur, are copied in the spare memory, and then the EEPROM chip of interest and the spare memory are replaced with each other. The EEPROM chips may be replaced with a plurality of memory blocks or clusters defined in a block erasure type EEPROM.
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