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Original question:

DS90UB960-Q1: TVS

DS90UB960-Q1: CMLOUT

Zehui Li
Intellectual 540 points
Part Number: DS90UB960-Q1
Other Parts Discussed in Thread: DS90UB9702-Q1

Hi,

    Could you explain how the CMLOUT works?

    It seems to only support Channel Monitor Loop-Through Output Driver for DS90UB960.But for DS90UB9702, it is Serial Output Port. So what's the difference of CMLOUT between different deserializer parts? Is it compatible or totally irrelevant?

    For Serial Output Port use, could I understand it as a FPD-Link pin of a serializer? And for the output signal, is it just a replication of related FPD-Link RX like CMLOUT1 for RX1? Or can we do thing about it like repacking different RX input?

  • +1
    TI__Guru** 103215 points

    Zehui,

    The DS90UB960-Q1 CMLOUT port works like a linear redriver. The 960 receives the forward channel signal, removes the back channel signal, and then applies a linear equalization to the signal (CTLE) to boost the high frequency before sending out of the CMLOUT pins. 

    The DS90UB9702-Q1 CMLOUT port works like a retimer. receives the forward channel signal, removes the back channel signal, and then applies a linear equalization to the signal (CTLE) to boost the high frequency. It also reclocks the data using the clean 25MHz local REFCLK to improve output jitter performance. 

    The 960 redriver-type CMLOUT is not recommended for downstream connection to another DES. It is just for diagnostic monitoring purposes during debug. The 9702 retimer-type CMLOUT can drive another downstream deserializer because of the jitter cleaning capability. 

    In both cases, CMLOUT is a direct copy of the forward channel signal from the serializer. There is no data repacking being done 

    Best Regards,

    Casey