Data exchange circuit for a magnetic memory apparatus

Details Data exchange circuit for a magnetic memory apparatus Data exchange circuit for a magnetic memory apparatus

1981-12-24

1984-01-03

Canney, Vincent P.

Dynamic magnetic information storage or retrieval

General processing of a digital signal

Data clocking

360 40, G11B 509

Patent

active

044245360

ABSTRACT:
A data exchange circuit to change modified frequency modulation (MFM) signals read from a magnetic memory media and converted into data pulse signals to non-return-to-zero signals. The circuit comprises an input flip-flop which receives MFM data pulse signals from a pulse forming circuit. Pre outputs of the input flip-flop is received by a phase locked loop and the other output of the input flip-flop is received by a delay circuit to vary the pulse width of the MFM pulse signal. Instruction signals are provided to the delay circuit to define data reading margins, and to accommodate variations in data widths or data shifts when no particular margin is determined. The phase locked loop synchronizes it's output when the output of the MFM data pulse signal in order to provide clock signals for non-return-to-zero data. The outputs of the phase locked loop and the delay circuit are converted to respective flip-flops in order to generate the non-return-to-zero signals.

REFERENCES:
patent: 4371975 (1983-02-01), Dugan
patent: 4385396 (1983-05-01), Norron

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