Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Patent
1998-02-05
2000-02-29
Cabeca, John W.
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
714721, 36518533, 712 37, G06F 1578
Patent
active
060322217
ABSTRACT:
A flash memory capable of solving a problem of a conventional flash memory in that it requires considerable time and effort to measure supply voltages generated in the flash memory during writing, erasing and verifying operations, and is difficult to acquire accurate results, because they cannot be measured by a tester and must be measured manually by putting a probe directly to voltage supply lines. The present flash memory includes a first voltage transfer circuit for supplying an A/D converter with an analog signal input to a microcomputer, and a second voltage transfer circuit for supplying the input terminal of the A/D converter with a programming voltage generated by a flash memory voltage generator, and brings the first voltage transfer circuit into a conducting state and the second voltage transfer circuit into a nonconducting state in a normal operation mode, and brings the first voltage transfer circuit into the nonconducting state and the second voltage transfer circuit into the conducting state in a voltage measurement mode to measure voltages on the flash memory power supply lines.
REFERENCES:
patent: 4382279 (1983-05-01), Ugon
patent: 5153853 (1992-10-01), Eby et al.
patent: 5909397 (1999-06-01), San et al.
Cabeca John W.
Mitsubishi Denki & Kabushiki Kaisha
Tran Denise
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