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Highspeed Repeater with Aurora protocol 8B/10B or 64B/66B encoding

Nils Panitzsch
Prodigy 70 points
Other Parts Discussed in Thread: DS100BR111, DS280BR810, DS125BR820, DS100BR410, DS125BR401A, DS125BR800A, DS125BR111, DS80PCI810

Hello,

we need a highspeed repeater / signal conditioner for a connection between a Xilinx Kintex-7 FPGA and a SFP Tranceiver (AFBR-57D9AMZ).

Currently Aurora protocol 8B/10B or 64B/66B encoding is used. In the future may also be more.

Which highspeed repeater - 1 to 4 Rx/Tx channels - can be used for the Aurora protocol 8B/10B or 64B/66B encoding?

  • 0
    TI__Mastermind 43795 points

    Hi Nils,

    There are many repeaters available for the Aurora interface.  The repeater used would need to be able to support the datarate used by the Aurora Tx and Tx SOC components.  Common components for ~ 10 Gbps operation include the DS100BR111, DS100BR410, and DS125BR820.  There are also repeaters for 25+ Gbps data rates like the DS280BR810.

    Regards,

    Lee

  • 0 in reply to Lee Sledjeski
    Prodigy 70 points

    Hi Lee,

    Thank you for your quick response.

    What about the DS125BR401A Repeater. Does this device also support the Aurora protocol 8B/10B or 64B/66B encoding?

    The arrangement of pins would fit much better for our application.

    What do I have to look out for?

    Is the support of a protocol mainly dependent on the hardware encoding?

    Or is support limited mainly by protocol features such as link training?

    Best Regards
    Nils Panitzsch

  • 0 in reply to Nils Panitzsch
    TI__Mastermind 29655 points
    Hi Nils,

    There should not be an issue using the DS125BR401A. Since our repeaters do not perform any signal processing aside from analog signal conditioning (for example, Receive-side EQ or Transmit-side De-emphasis) and use AC coupling, they should work well with 8B/10B or 64B/66B encoding.

    If you use the DS125BR401A, I would advise determining which side of the repeater has more loss at the input side. If you look at the arrangement of the channels, Channels 0-3 have more EQ boost (they are based on a design similar to the DS125BR800A), whereas Channels 4-7 are more linear and therefore have less boost and no de-emphasis (they are based on a design similar to the DS125BR820). This "hybrid" device was originally done to support link-training in protocols such as SAS, 10G-KR, or PCIe. The side facing more input loss will interface with the B-channels (Channels 0-3), and the side with more output loss will interface with the A-channels (Channels 4-7).

    Support of a protocol from a repeater standpoint is typically dependent on whether the operating data rate is supported by the device.

    A device from our advanced linear repeaters (for example, DS80PCI810, DS125BR820, DS125BR401A (Channels 4-7), and DS125BR111) are easier to use in protocols that require link-training, but link-training protocol support is not exclusive to just these devices.

    Regards,

    Michael