21 Jan '15, 4pm
Microsemi & Intrinsic-ID Team To Offer Extreme-Security FPGAs & Systems | EE Times via @eetimes
The PUF in Microsemis SmartFusion2 and IGLOO2 devices is an SRAM memory-type PUF, which is licensed from Intrinsic-ID. The Microsemi PUF uses a 16 Kbit on-chip dedicated SRAM, which is in its own power domain. At the heart of each cell in the memory are two back-to-back (cross-coupled) inverters. When the SRAM is powered up, each bit theoretically has a 50:50 chance of ending up containing a logical zero or a one. In practice, however, minute variations in variables that are "baked into the device" -- like differences in the diffusions and photolithography for the two inverters -- mean that approximately 95% of the bits will consistently power up in the same state (a zero for some bits, a one for others) for each power cycle, while the remaining 5% "noisy bits" are so finally balanced that they will randomly power up in either state due to effects like thermal noise.