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DS125DF1610 for SAS/SATA application

Maria Sukiasyan
Prodigy 150 points
Other Parts Discussed in Thread: DS125DF1610

Hello,

Is there any way to use ds125df1610 for SATA/SATA use cases. I know that ds125BR8x0 will serve better the purpose :):)

In my application I have two quads of ds125df1610 unused and need to re-drive some SAS ports to reach longer distance. The CDR will be bypassed completely for these ports.

Another big question is 85Ohm diff pair routing. I'm not sure I can do it with this chip.

Thanks !!!!

  • 0
    TI__Mastermind 43795 points

    Hi Sergey,

    It is not recommended to use the DS125DF1610 in a SAS/SATA application.  This device will tend to distort the OOB signaling used to communicate between Host and Storage.  If this signaling fails, the system will not configure correctly.

    We recommend to keep impedance targets constant throughout the length of the channel.  Either 85 or 100 Ohm target is okay.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 150 points

    Hi Lee,

    Thanks a lot of for the info ! I'm replacing df1610 with br820. 

    One more general question. Our host board needs to support two different daughter cards routed with 85Ohm and 100Ohm diff pairs (PCIE and 10G Ethernet). Can you suggest what impedance to use on host board ? Host board connector is right angle PCIE x16. We have 85 and 100 Ohm versions of it. 

    The PCB manufacturing impedance control is +/-10%, so if daughter board goes to -10% and host goes to +10% difference will be huge.

    Thanks !

  • 0 in reply to Maria Sukiasyan
    TI__Mastermind 43795 points

    Sergey,

    Are the Ethernet and PCIe signals routed on the same traces?

    If not just use two different trace widths to achieve 85 and 100 ohm impedance at the same time.

    It is probably not that easy.  Send I quick drawing with the component locations so I can better understand your situation.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 150 points
    Hi Lee,

    Sorry I explained it very wrong :(
    Host board with TI chips has x24 PCIE edge connector. To that connector we need to attach two different kinds of line cards.

    The PCIE line card is 85 Ohm, 10G Ethernet Line card is 100 Ohm. So same trace on the host board should be able to handle 85Ohm and 100Ohm traces on the line cards.

    Thanks !
  • 0 in reply to Maria Sukiasyan
    TI__Mastermind 43795 points

    Hi Sergey,

    That is a difficult situation. It sounds like the best compromise would be to target 92-93 ohms.

    Regards,

    Lee