Dual cycle data detection system and method for bubble memories

Details Dual cycle data detection system and method for bubble memories Dual cycle data detection system and method for bubble memories

1981-06-25

1983-01-18

Moffitt, James W.

Static information storage and retrieval

Magnetic bubbles

Detectors

G11C 1908

Patent

active

043695019

ABSTRACT:
A data detection system and method for a bubble memory is disclosed in which the memory is operated in a start-stop mode during reading of data stored in two separate major loops which are stepped concurrently and wherein each major loop comprises interleaved data and no-data cells. The field rotation is controlled so that if the read operation is stopped, a no-bubble cell of each major loop is stopped adjacent the magneto-resistive sensor which provides read data signals to the detector of that major loop. The detector involves a detection cycle comprising a reference portion and a data portion. The signal generated during the data portion is integrated and compared against the integrated value of the signal generated during the previous reference portion. The comparison of two integrated values, one from a data cell and one from a reference cell, produces different results depending on whether a bubble or no-bubble was stored in the data cell. In each detector, the result of the comparison is buffered in a latch which permits the data from the system to be clocked out of the latches at a frequency corresponding to the stepping frequency of the major loops.

REFERENCES:
patent: 3813660 (1974-05-01), Buhrer
patent: 3953840 (1976-04-01), Cutler et al.
patent: 4177521 (1979-12-01), Schaefer
patent: 4308593 (1981-12-01), Young et al.

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