Non-volatile memory card device having flash EEPROM memory chips

Details Non-volatile memory card device having flash EEPROM memory chips Non-volatile memory card device having flash EEPROM memory chips

1993-02-05

1996-06-25

Swann, Tod R.

Boots, shoes, and leggings

3649578, 36496576, 36496579, 364DIG2, 365218, 371 102, G06F 1202, G06F 1300

Patent

active

055309380

ABSTRACT:
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.

REFERENCES:
patent: 5303198 (1994-04-01), Adachi et al.
patent: 5341339 (1994-08-01), Wells
patent: 5355464 (1994-10-01), Fandrich et al.
patent: 5357475 (1994-10-01), Hasbun et al.

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