SRAM CIRCUITS FOR CIRCUIT IDENTIFICATION USING A DIGITAL FINGERPRINT

摘要

Circuitry that includes static random access memory (SRAM) access circuitry and a group of SRAM memory cells is disclosed. A digital fingerprint of the group of SRAM memory cells is determined by using the SRAM access circuitry to force at least a portion of the group of SRAM memory cells into a metastable state and then releasing the portion of the SRAM memory cells. Each SRAM memory cell that was released then selects one of two stable states and the SRAM access circuitry provides a selection profile based on the selections. The digital fingerprint is based on the selection profile.