Apparatuses, circuits, and methods for reducing metastability in data synchronization
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United States of America Patent
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Sep 2, 2014
Grant Date -
Oct 10, 2013
app pub date -
Apr 10, 2012
filing date -
Apr 10, 2012
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Abstract
Apparatuses, circuits, and methods are disclosed for reducing or eliminating unintended operation resulting from metastability in data synchronization. In one such example apparatus, a sampling circuit is configured to provide four samples of a data input signal. A first and a second of the four samples are associated with a first edge of a latching signal, and a third and a fourth of the four samples are associated with a second edge of the latching signal. A masking circuit is configured to selectively mask a signal corresponding to one of the four samples responsive to the four samples not sharing a common logic level. The masking circuit is also configured to provide a decision signal responsive to selectively masking or not masking the signal.
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