Method for dynamically accessing and programming resistive change element arrays

摘要

Methods for dynamically programming and dynamically reading one or more resistive change elements within a resistive change element array are disclosed. These methods include first pre-charging all of the array lines within a resistive change element array simultaneously and then grounding certain array lines while allowing other array lines to float in order to direct discharge currents through only selected cells. In this way, resistive change elements within resistive change element arrays made up of 1-R cells—that is, cells without in situ selection circuitry—can be reliably and rapidly accessed and programed.

主权项

1. A method for determining the resistive state of at least one resistive change element within a resistive change element array, comprising:
providing a resistive change element array, said resistive change element array comprising:
a plurality of word lines;a plurality of bit lines; anda plurality of resistive change elements, wherein each resistive change element has a first terminal and a second terminal and wherein said first terminal of each resistive change element is in electrical communication with a word line and said second terminal of each resistive change element is in electrical communication with a bit line; charging all of said bit lines and all of said word lines within said resistive change element array to a preselected voltage level simultaneously; selecting one word line within said resistive change element array and allowing said selected word line to float while driving all of the other word lines and all of the bit lines to ground; observing the current through those resistive change elements that are in electrical communication with said selected word line as said selected word line discharges through those resistive change elements to measure at least one read current value for at least one resistive change element; and determining from said at least one read current value the resistive state of at least one resistive change element.