Apparatuses, methods, and systems for glitch-free clock switching

• Main Authors: ARCUDIA KENNETH LUIS, CHANG CHIA HENG, WINEMILLER CHAD EVERETT, SPEARS KEVIN WAYNE, DEANS RUSSELL COLEMAN, AMELIFARD BENHAM, BOYETTE JON RAYMOND
• Format: Patent
• Language: Chinese; English
• Published: 28.11.2017
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; PHYSICS

An electronic circuit is switched from a lower-frequency reference clock to a higher-frequency reference clock. An oscillation detection logic is configured to determine the stability of the higher-frequency reference clock prior to switching the electronic circuit to the higher- frequency reference clock. The oscillation detection logic derives a sampled clock signal from the higher-frequency reference clock, wherein the sampled clock signal has a slower frequency than the lower-frequency reference clock. The oscillation detection logic then compares the sampled clock signal against the lower-frequency reference clock to determine the stability of the higher-frequency reference clock. By deterministically detecting stability of a reference clock prior to switching to the reference clock, it is possible to avoid premature switching to an unstable reference clock, thus providing glitch-free clock switching in the electronic circuit. 电子电路从低频参考时钟切换至高频参考时钟。振荡检测逻辑被配置成在将电子电路切换至高频参考时钟之前确定高频参考时钟的稳定性。振荡检测逻辑从高频参考时钟推导出采