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Altera_Forum
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16 years ago

max CID length for transceivers

Does anyone know what is the max CID (consecutive identical digits) length the CDR can tolerate before it loses its lock on the incoming data? I've been reading through the docs for the Stratix IV t...
Altera_Forum's avatar
Altera_Forum
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16 years ago

I think the run length violation detection info matters, because it implies that a respective run length can be processed by the receiver channel at all, (although nothing is explicitely said about CDR usage).

Even if the CDR can operate at 200 run length, I would try to avoid that high run lengths in a protocol, because it implies higher jitter sensitivity and long locking times, or in other words, low robustness.