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DS100BR111: DS100BR111 for 10G SFI

Terry Wu
Expert 1680 points

Part Number: DS100BR111
Other Parts Discussed in Thread: , DS110DF111, DS125DF111

Hello Sir,

We use DS100BR111 for 10G SFI signal conditioner . Is it OK ?

Data flow is :

SoC -> 2~3 inch FR4 -> PCI express slot -> Add on card with PCI express golden finger -> 2 inch FR4 trace -> DS100BR111 -> 1 inch trace -> SFP connector

Is there use cases for PCI express connector transmit 10G signal ?

BTW. Is there difference for DS100BR111 and DS100BR111A ?

Many thanks !

  • 0
    TI__Mastermind 18425 points
    Hi Terry,

    I will move this question to the High Speed Interface forum so that it gets the correct visibility.

    -Regards,
    Aniruddha
  • 0
    TI__Mastermind 43795 points

    Hi Terry,

    The DS100BR111 or DS100BR111A can be used for the SFI interface.  Alternatively you could utilize a DS110DF111 retimer if the host eye mask requirement is difficult to meet.

    It is possible to do a single layout to accomodate either the "BR" equalizer or "DF" retimer designs.

    The PCI express connector does have some limitations with regards to impedance control.  I would try to utilize the PCI express GEN4 (16 Gbps) layout techniques to help with any reflections.  I would also recommend using a 85 Ohm differential impedance target to better work with the connector.

    The difference between the 111 and 111A is just the output VOD level.  Otherwise they are the same design.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Expert 1680 points

    Hello Lee,

    Thanks your comment ~

    Yes ! 10G SFI should be ok for DS100BR111.

    We'll try DS125DF111 for this environment whether better than redriver DS100BR111.

    Do you have PCB/layout PCIe GEN4 design info could share ?

    BTW. Webench have simulation for DS1xx series products. But it can't setup trace length from Tx -> Redriver  and the trace length of Redriver to Rx .

    Is my understanding correct ?  TKS !

  • 0 in reply to Terry Wu
    TI__Mastermind 43795 points

    Hi Terry,

    We do not have PCIe GEN4 information currently available.  The specification is in the final stages to "Revision 1.0" so expect to see some updates as we go forward.

    Here are some step by step instructions for the WEBENCH tool.  You should be able to adjust the loss for pre- and post- redriver channels.

    www.ti.com/.../interface.html

    Regards,

    Lee