IEICE Electronics Express
Online ISSN : 1349-2543
ISSN-L : 1349-2543
LETTER
Automatic on-chip backup clock changer for protecting abnormal MCU operations in unsafe clock frequency
Joonghyun AnMoon Gi SeokDaejin Park
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JOURNAL FREE ACCESS

2016 Volume 13 Issue 24 Pages 20160808

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Abstract

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.

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© 2016 by The Institute of Electronics, Information and Communication Engineers
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