Non-volatile memory card device having flash EEPROM memory chips with designated spare memory chips and the method of rewriting data into the memory card device

摘要

A memory card device and method of rewriting the same which require no separate memory for saving all data in a chip containing data to be rewritten, and in which data are not lost due to a power source failure that may occur during writing operation. Each of a plurality of chips which constitute a memory card is provided with; a logic address, a control region containing a write start number and a write completion number, and a data region. An erased chip is prepared within the memory card device. A write start number in a chip containing data to be rewritten is written, for example, into the erased chip by performing incrementing operation. Data in the data region which is not to be rewritten in a chip containing data to be rewritten are copied into the erased chip and new rewrite data are written into the erased chip. A write completion number in the chip containing data to be rewritten is written, for example, into the erased chip by performing incrementing operation on the write completion number. Finally, the chip which contained data to be rewritten is erased.