Static information storage and retrieval – Systems using particular element – Semiconductive
Patent
1979-12-28
1981-09-01
Fears, Terrell W.
Static information storage and retrieval
Systems using particular element
Semiconductive
365154, 365189, 3072386, G11C 1140
Patent
active
042875757
ABSTRACT:
A random access memory system is disclosed in which data stored in two distinct memory locations defined by distinct address signals can be non-destructively read out simultaneously. The system employs a matrix of two-port memory cells, each cell functioning to store one binary bit of data in a conventional cross-coupled common emitter flip-flop. A pair of input/output transistors have their emitters connected to the respective control nodes of the static cell, their bases connected to first and second word lines, and their collectors connected to first and second bit sense lines. The word lines and bit lines are addressed and pulsed such that during reading of the selected cells, current flows through only one of the input transistors of one of the cells of a sense line whereon, during writing, current flows through both of the input/output transistors, the direction of current flow during writing depending on the value of the binary bit being stored. The input/output transistors associated with each cell are integrated onto the chip and occupy only slightly more area than multi-configured devices conventionally employed in prior art two-port cells.
REFERENCES:
patent: 3675218 (1972-07-01), Sechler
Eardley David B.
Matick Richard E.
Cummins Richard E.
Fears Terrell W.
International Business Machines - Corporation
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