Multiple access store

Details Multiple access store Multiple access store

1979-12-07

1981-07-21

Fears, Terrell W.

Static information storage and retrieval

Systems using particular element

Flip-flop

365189, 3072381, G11C 1300, G11C 1140

Patent

active

042801974

ABSTRACT:
A multiple access store having bipolar monolithic memory cells. Each cell includes a memory flip-flop comprised of cross-connected NPN transistors. A single concurrent read and write for each cell is achieved by a pair of accessing transistors, one accessing transistor of the pair connected at its base to the base of one of the flip-flop transistors and the other accessing transistor of the pair connected at its base to the base of the other of the flip-flop transistors. Each accessing transistor of an accessing transistor pair is connected at its collector to an associated bit/sense line. The emitter of each of the accessing transistors of an accessing transistor pair are connected together and the connected emitters are connected to a device that supplies a current supply to the emitters in response to a word signal. The emitters of the cross-connected flip-flop transistors are connected to an associated mode select line over which is applied a signal having a potential defining a write mode condition and a signal having a lower potential defining a read mode condition for the cell. Each pair of bit/sense lines and associated pair of accessing transistors that is added to each of the cells of a memory array may be operated to add an additional concurrent write of one word and a read of a different word for the array.

REFERENCES:
patent: 3354440 (1967-11-01), Farber et al.
patent: 3675218 (1972-07-01), Sechler
patent: 4127899 (1978-11-01), Dachtera

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