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DS250DF810: DS250DF810 Support 16.22016Gbps Data Rate

Qiang Ren
Intellectual 2115 points
Part Number: DS250DF810
Other Parts Discussed in Thread: DS160PR410, DS280BR820

Tool/software:

Team,


Does DS250DF810 support 16.22016Gbps(JESD SerDes Rate). In default support data rate mode, it can’t. But seems that manual support mode could do. But I still want to double confirm with you, if any customer has this use case, thanks.

 Regards,

Qiang

  • 0
    TI__Mastermind 39163 points

    Hi Qiang,

    Please note the data rates the retimer can acquire CDR lock to.  Data rates outside this range can only be supported in CDR bypass.

    Thanks,

    Drew

  • 0 in reply to Drew Miller1
    TI__Intellectual 2115 points

    Hi Drew,

    Thanks for reply. Customer use case is that transmitter - 20db IL trace - Repeater / Retimer - 20db IL trace - Receiver. Do you have suggested or recommended repeater or retimer to support this case? Thanks!

    Best,

    QIang

  • 0 in reply to Qiang Ren
    TI__Mastermind 39163 points

    Hi Qiang,

    We don't have a retimer device that will lock to 16.22016 Gbps.

    20 dB IL prior to repeater/retimer is easier requirement to meet.  DS160PR410 (or other PCIe gen4 redriver) target ~16 Gbps data rate and has CTLE boost of 18 dB at 8 GHz.

    The 20 dB IL between repeater and receiver is more challenging since a linear redriver such has DS160PR410 will not have transmitter equalization.  A few thoughts come to mind:

    • Customer can rely more heavily on transmitter TX emphasis (pre/post cursor) and the receiver equalization capability.  Do we know what equalization capabilities the transmitter and receiver have?
    • Customer might also consider DS280BR820.  I don't have CTLE boost value at 8 GHz for this device, but maximum boost at 10 GHz is 24 dB.  I expect boost at 8 GHz to be similar.  DS280BR820 has the advantage that it can act as a limiting redriver and has a fixed-width 3-tap FIR TX equalization that would help compensate for insertion loss between the repeater and receiver.

    Thanks,

    Drew