Welsh Flaxman & Gitler LLC
Method and system for identifying counterfeit programmable logic devices
A method for combating counterfeiting and tampering of integrated circuits includes the steps providing a programmable logic device, the programmable logic device including an arithmetic circuit implemented into the substrate, and constructing an arithmetic feedback oscillator using the arithmetic circuit. The step of constructing the arithmetic feedback oscillator includes incorporating a feedback loop into the arithmetic circuit and feeding output bits back into an input of the arithmetic circuit. The method also includes the step of selecting input values producing repeating values in a lesser order bit of a product of the arithmetic circuit when first and second input are applied to the arithmetic circuit and monitoring the lesser order bit and determining a predicted pattern.
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H03K
inventional
James M.
Lewis