Static information storage and retrieval – Read/write circuit – Signals
Patent
1981-07-16
1985-06-11
Moffitt, James W.
Static information storage and retrieval
Read/write circuit
Signals
365130, 365209, G11C 702, G11C 11061
Patent
active
045233020
ABSTRACT:
A highly efficient core memory drive system passes currents down a selected X and Y conductor and divides the currents for return through the unselected drive wires in the same X or Y dimension. The drive conductors are coupled to drive and sink switches at a drive end and the X conductors are connected together at an opposite common end and the Y conductors are connected together at an opposite common end. Resistors provide a current path between the drive end of each X conductor and an X resistor bus and between the drive end of each Y conductor and a Y resistor bus. A pair of switching transistors including a sink transistor and a drive transistor is connected to a drive end of each conductor to generate a drive current therein. The drive current divides equally among the unselected conductors at the common end to return through the unselected conductors and through the resistors to the resistor bus. The X and Y resistor buses can be connected together to permit a single drive current to pass through both a selected X conductor and a selected Y conductor. The return currents reduce the current experienced by each partially selected core to thereby improve current margins.
REFERENCES:
patent: 2900623 (1959-08-01), Rosenberg
patent: 3432835 (1969-03-01), Foglia
patent: 3579209 (1971-05-01), Gilligan
IBM Technical Disclosure Bulletin-vol. 11, No. 1, Jun. 1968, p. 86.
Jan A. Rajchman, "Static Magnetic Matrix Memory and Switching Circuits", RCA Review, Jun. 1952, pp. 183-199.
N. M. Blachman, "On the Wiring of Two-Dimensional Multiple-Coincidence Magnetic Memories", IRE Transactions on Electronic Computers, Mar. 1956, pp. 19-21.
Jan A. Rajchman, "Ferrite Apertured Plate for Random Access Memory", Mar. 1957, Proceedings of the IRE, pp. 325-334.
Ampex Corporation
Moffitt James W.
Perkins Bradley A.
Talcott Joel D.
Thibault Harry G.
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