Recirculating loop memory array fault locator

Details Recirculating loop memory array fault locator Recirculating loop memory array fault locator

1980-06-26

1982-01-26

Atkinson, Charles E.

Excavating

371 25, G06F 1116

Patent

active

043131999

ABSTRACT:
Apparatus is disclosed for quickly testing memory arrays of multiple recirculating loop memory elements and for locating faulty elements, if any, within designated subdivisions of said array. All loops are loaded with identical test bits. The loaded data is verified and faulty elements, if any, are located by means of a plurality of comparison AND gates. Each gate is connected to the output of a respective subdivision of the array elements and produces a first output signal when all such outputs are identical (on a serial bit-by-bit basis) and produces a second output signal when all said outputs are not identical. The output signals from the respective comparison AND gates are sensed in serial succession to locate the array subdivision containing any faulty elements.

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patent: 3783254 (1974-01-01), Eichelbarger
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patent: 3982111 (1976-09-01), Lerner et al.
patent: 4001818 (1977-01-01), Radichel et al.
patent: 4038648 (1977-07-01), Chesley

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