Automatic on-chip backup clock changer for protecting abnormal MCU operations in unsafe clock frequency

作者：An Joonghyun; Seok Moon Gi; Park Daejin^*

来源：IEICE Electronics Express, 2016, 13(24): 20160808.

DOI：10.1587/elex.13.20160808

• safety
• clock failure protection
• glitch-free clock switch
• noise cancel

Mission-critical MCU-based systems under severe electrical situations cause malfunctioning by the disturbance in the clock path. MCU-based systems in clockless status loses their contrability in high-current output or glitch-clock injection may destroy status value of flip-flops. In this paper, we propose the automatic clock failure detection and protection by implementing a fully synthesizable edge detector, noise canceller logic and glitch-free clock changer circuit. To determine several noise-vulnerable data/clock paths, we propose a pre-simulation framework to reconstruct a clock noise propagation path from the entire circuit netlist. We successfully increased the noise immunity characteristics by allocating the detector units into efficient locations.

• 出版日期2016-12-25