Read and write drive system for a 21/2D coincident current magne

Details Read and write drive system for a 21/2D coincident current magne Read and write drive system for a 21/2D coincident current magne

1975-09-08

1977-09-06

Habecker, Thomas B.

Communications: electrical

Digital comparator systems

340174LA, G11C 1102

Patent

active

040471640

ABSTRACT:
A read and write drive system is disclosed for a 21/2D coincident current magnetic core memory of the type in which for each word bit, bit lines threaded through the magnetic cores are arranged in a matrix of M groups, each of N bit lines. The drive system includes for the bit line matrix of each word bit a separate set of M write drive switches, and for n matrices of n different word bits, wherein n .gtoreq. 2, M read sink switches, N read drive switches and N write sink switches. These switches are used to apply 1/2 drive current through selected bit lines, during the read operation, to read out the n word bits of a selected word and to apply 1/2 drive current to independently store either a binary 1 or a binary 0 in each of the n word bits. The total number of switches, required for n word bits, is M(n+1) + 2N switches.

REFERENCES:
patent: 3425044 (1969-01-01), Ferrier
patent: 3440624 (1969-04-01), Sherlock
patent: 3500359 (1970-03-01), Hsieh
patent: 3568152 (1971-03-01), Jallen
patent: 3568170 (1971-03-01), Catalani
patent: 3573764 (1971-04-01), Larsen
patent: 3603938 (1971-09-01), Cooper
patent: 3623033 (1971-11-01), Harding
patent: 3651497 (1972-03-01), Cook
patent: 3675221 (1972-07-01), Harding
patent: 3849768 (1974-11-01), Durvasula

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