Non-volatile semiconductor memory device with diagnostic potenti

Details Non-volatile semiconductor memory device with diagnostic potenti Non-volatile semiconductor memory device with diagnostic potenti

1997-05-13

1998-12-29

Nelms, David

Static information storage and retrieval

Read/write circuit

Erase

36518533, 3651853, G11C 700

Patent

active

058547665

ABSTRACT:
When floating gate type memory transistors undesirably enter into an over-erased state, a diagnostic potential generator supplies a first diagnostic potential to a source line and second and third diagnostic potentials to non-selected word lines and a selected word line; the potential difference between the first diagnostic potential and the second diagnostic potential causes an over-erased memory transistor to be turned off, and the potential difference between the first diagnostic potential and the third diagnostic potential allows an over-erased memory transistor to turn on so as to identify each over-erased memory transistor by its row and column addresses.

REFERENCES:
patent: 4841482 (1989-06-01), Kreifels et al.
patent: 5237535 (1993-08-01), Meilke et al.
patent: 5287317 (1994-02-01), Kobayashi et al.
patent: 5347490 (1994-09-01), Terada et al.
patent: 5554868 (1996-09-01), Hayashikoshi et al.

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