Semiconductor memory device having diagnostic unit operable on p

Details Semiconductor memory device having diagnostic unit operable on p Semiconductor memory device having diagnostic unit operable on p

1991-03-29

1992-01-07

Fears, Terrell W.

Electricity: electrical systems and devices

Electric charge generating or conducting means

365201, 371 211, 371 511, G11C 1300

Patent

active

050797476

ABSTRACT:
A semiconductor memory device is installed in one of a single data output and a parallel data output model, and a single data output unit associated with a first diagnostic unit and a parallel data output unit with a second diagnostic unit are incorporated in the semiconductor memory device for selective usage, wherein a first number of data bits read out from memory cells are subjected to diagnosis for supplying a plurality of first diagnostic signals in the signal data output model, however, the first diagnostic signals are further subjected to diagnosis for producing a single second diagnostic signal in the parallel data output model without supplying the first diagnostic signals to the outside thereof so that the internal wiring arrangement is simplified and occupies a small amount of real estate.

REFERENCES:
patent: 4967394 (1990-10-01), Minagawa

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