Patent ID: 11962709
Assignee: MARVELL ASIA PTE LTD
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 6:
7. A method for deriving a physical unclonable function from a semiconductor device that has a plurality of bitcells, each bitcell being readable as one of a ‘0’ value and a ‘1’ value and comprising a differential transistor pair including a plurality, fewer than three, of transistors, the method comprising:
selectably biasing reading of the plurality of bitcells toward ‘0’ values by injecting a margining current into a first leg of a differential sense amplifier coupled to at least one bitcell of the plurality of bitcells, to identify addresses of bitcells having a stable ‘1’ value; and
at a time different from when selectably biasing reading of the plurality of bitcells toward ‘0’ values, selectably biasing reading of the plurality of bitcells toward ‘1’ values by injecting a margining current into a second leg of a differential sense amplifier coupled to the at least one bitcell of the plurality of bitcells, to identify addresses of bitcells having a stable ‘0’ value.