Patent ID: 8461865

Claim:
A logic built-in self test system, comprising a device under test having a first plurality of first bistable multivibrator circuits; a logic built-in self test (LBIST) controller; and a second plurality of second bistable multivibrator circuits, each second bistable multivibrator circuit coupled to a corresponding first bistable multivibrator circuit and configured to swap a second state value kept by said second bistable multivibrator circuit with a first state value kept by said corresponding first bistable multivibrator circuit in response to a first control signal from said LBIST controller, and said second bistable multivibrator circuits coupled to form one or more scan chains when receiving a second control signal from said LBIST controller, wherein said second bistable multivibrator circuits are further configured to receive a second clock signal, the second clock signal different from a first clock signal received by said corresponding first bistable vibrator circuits.