Nonvolatile semiconductor memory device with a fail bit...

Details Nonvolatile semiconductor memory device with a fail bit... Nonvolatile semiconductor memory device with a fail bit...

2006-04-04

2006-04-04

Tu, Christine T. (Department: 2133)

Error detection/correction and fault detection/recovery

Pulse or data error handling

Error count or rate

C714S718000, C714S736000

Reexamination Certificate

active

07024598

ABSTRACT:
A nonvolatile semiconductor memory device has a special test mode and circuitry for counting its own fail bits. During the test mode, test data is stored in the memory, and also in a special expected data buffer. The test data stored in the memory cells are then compared to that stored in the expected data buffer. Where there is no correspondence, fail bits are detected. The lack of correspondence is registered, counted, and output to a data output buffer block.

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