21/2D core memory

Details 21/2D core memory 21/2D core memory

1976-10-15

1978-06-20

Canney, Vincent P.

Static information storage and retrieval

Systems using particular element

Three-dimensional magnetic array

G11B 14063

Patent

active

040965830

ABSTRACT:
A large, 2 wire, 21/2D core memory includes four, 1K (1024) by 1280, core frames with 1280 Y conductors each stringing and inductively coupling a column of 1024 cores in each of the four frames and 4K orthogonal X conductors each stringing and inductively coupling one row of 1280 cores. A word position within the memory is defined by 5 pairs of Y conductors, a corresponding X conductor from each frame, and selection of relative current directions in the Y conductors. Reading of a 20 bit word is accomplished with 5 sense amplifiers in four rapid succession read sub-operations. Writing is accomplished in two sub-operations by separately controlling partial select digit currents in each of the 5 pairs of Y conductors. A bidirectional X drive and switching arrangement utilizes overlapping X drive currents and shared circuitry to maximize memory speed and reduce electronic components costs.

REFERENCES:
patent: 3466633 (1969-09-01), Gilligan et al.
patent: 3500359 (1970-03-01), Hsieh et al.
"Ferrite-Core Memories" by R. A. Hill, Electronics World Oct. 1970 pp. 49-52.
"1/2 D High Speed Memory Systems-Past, Present & Future" by T. J. Gilligan, IEEE Trans. on Electronic Computers vol. EC-15 #4 8/66

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