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#41 | |
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#42 |
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Join Date: Jun 2009
Location: Dublin, then Glasgow
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Your sampling rate has to be much higher than whatever you're trying to measure, especially if your LA isn't synchronised with the source clock. A 24MHz sampling rate simply isn't enough to accurately capture a 12MHz signal. An absolute bare minimum would be about 1:4 just to be able to capture each transition, so you really need a minimum of 50MHz sample rate to deal with a 12MHz signal. DSLogic recommend a 1:10 ratio, so 120MHz sampling rate for a 12MHz signal.
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#43 | |
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Join Date: Jun 2016
Location: UK
Posts: 428
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Another reason why I like USB LAs, the protocol decoding tends to be better and you can always hack it or write your own. |
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