Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1996-11-08
1999-11-30
Thai, Tuan V.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
711100, 711154, 711156, 36518509, 36518523, 36518529, 365190, 365207, 365218, G06F 1200, G11C 700, G11C 1606
Patent
active
059960418
ABSTRACT:
Integrated circuit memory devices with page copy flag cells include an array of memory cells and a plurality of flag cells coupled thereto which retain a flag to indicate whether a respective page of memory cells contains data copied in an inverted format from another page of memory cells. The memory cells and flag cells may comprise EEPROM cells and each page of memory cells preferably shares a word line with a respective flag cell. The flag may constitute a logic 1 (or logic 0) signal stored in the flag EEPROM cell to indicate whether the data in the corresponding page of memory is a true or an inverted copy of a page of data copied from another page at a different address. A page buffer is also provided to retain data read from a page of memory and read from a corresponding flag cell, and an exclusive OR gate for inverting the data outputted by the page buffer if the flag has been set and passing the outputted data unchanged if the flag has not been set.
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Samsung Electronics Co,. Ltd.
Thai Tuan V.
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