Methods and apparatus to test multi clock domain data paths with a shared capture clock signal
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United States of America Patent
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Apr 22, 2014
Grant Date -
Apr 26, 2012
app pub date -
Oct 20, 2010
filing date -
Oct 20, 2010
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Abstract
Methods, circuits and systems are provided to test data paths that traverse multiple clock domains using a common capture clock that is applied to multiple domains. Test data is launched to a first clock domain, and each of the clock domains is selected to receive the common capture clock signal while the test data propagates through the selected clock domain. The test data is capture after it has propagated through each of the multiple domains in response to the shared domains. Applying a common capture clock to each of the different domains eliminates hold time errors that might otherwise occur as the data transitions from one clock domain to another.
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