Flash memory having data refresh function and data refresh method of flash memory
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United States of America Patent
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Nov 12, 1996
Grant Date -
N/A
app pub date -
Jun 5, 1995
filing date -
Jan 9, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A flash memory and its data refresh method, where data read out in program verify mode and erase verify mode from read address are compared in each address (ST110), and data of a memory cell corresponding to inconsistent data are rewritten (ST112). Or adding values of data read out in the program verify mode and the erase verify mode are compared in each block (ST137) and a defective block is retrieved and data in each address are compared in the defective block (ST160), and data of a memory cell corresponding to inconsistent data are rewritten (ST162). Thereby, defective data can be retrieved and corrected.
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