Digital logic unit reconfigurable in nonvolatile fashion

Electronic digital logic circuitry – Multifunctional or programmable

Reexamination Certificate

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C326S038000, C326S047000

Reexamination Certificate

active

11795316

ABSTRACT:
A circuit analyzes the configured status of cells with a magnetic layer system, resistance of which may be altered by magnetic field pulses, forming a first line branch with data cells arranged in series and a second line branch with configurable cells arranged in series. The circuit includes a difference amplifier for determining a voltage signal giving the difference voltage of the line branches. Also included in the circuit is a voltage shifter for shifting the voltage signal to a value other than 0 volts, such as an adder or subtractor. In addition, the circuit includes a comparator or window comparator, for the decision as to whether the voltage signal lies in a valid or forbidden range and an evaluation unit for evaluating a valid voltage signal and for output of a logical low or high signal.

REFERENCES:
patent: 2003/0222375 (2003-12-01), Dohmann et al.
patent: 2003/0222676 (2003-12-01), Lienau
patent: 100 53 206 (2002-01-01), None
patent: 101 44 395 (2002-10-01), None
patent: 02/35704 (2002-05-01), None
patent: 2004/051853 (2004-06-01), None
R. Richter et al., “Nonvolatile field programmable spin-logic for reconfigurable computing”, Applied Physics Letters, vol. 80, No. 7, Feb. 18, 2002, pp. 1291-1293.
M. Hassoun et al., “Field Programmable Logic Gates Using GMR Devices”, IEEE Transactions on Magnetics, vol. 33, No. 5, Sep. 1997, pp. 3307-3309.
W. Black, Jr. et al., “Programmable logic using giant-magnetoresistance and spin-dependent tunneling devices”, Journal of Applied Physics, vol. 87, No. 9, May 1, 2000, pp. 6674-6679.
International Search Report, mailed May 8, 2005 and issued in corresponding International Patent Application No. PCT/EP2005/057054.
German Patent Office Action, mailed Sep. 23, 2005 and issued in corresponding German Patent Application No. 10 2005 001 938.2-42.

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