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USB is Universal Serial Bus. If your question relates to a specific chip, please mention it in your question.

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Why cable delay is limited to 26ns in USB 2.0?

Since USB uses source termination and voltage-mode drivers, this has to be the case, otherwise reflections can pile up and blow the driver. But this explanation is clearly not valid for USB 2.0. … Where does this mysterious constant of 26ns came from and how is it relevant to the Hi-speed USB 2.0? …
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