Editing Crossbar latch (section)

==Applications in arithmetic processing==
[[Image:Crossmath1a.JPG|thumb|500px|right|Fig. 1 Crossbar latches configured as a half-adder]]

Greg Snider of [[Hewlett-Packard]] created this application, which uses crossbar latches to imitate the functionality of a half adder, which is the foundation of modern computing systems. <ref>{{cite web|url=http://www.google.com/patents?id=zrB_AAAAEBAJ&dq=7203789,|title=U.S. Patent 7,203,789}}{{dead link|date=June 2024|bot=medic}}{{cbignore|bot=medic}}</ref> A crossbar tile is created in this application from a layer of horizontal row wires and a layer of vertical column wires, with [[memristor]] or similar materials sandwiched between the horizontal and vertical wire layers. Each crossbar tile intersection or junction can be configured to be in a high-resistance state with little or no current flowing between the horizontal and vertical wires, or in a low-resistance state with current flowing. Fig. 1 illustrates the configuration of a half-adder using a crossbar tile, as taught by Snider, with the nodes identifying junctions of the crossbar tile configured as low-resistance states. By setting different logic inputs A, NOT A, B, and NOT B to different row wires this configuration produces the sum and carry outputs typical for a half-adder. Connections between multiple half-adders may then be used to form full adders in accordance with conventional arithmetic architectures.