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AM69A: Jacinto high speed Ethernet and interface(AM69A, DRA821U)

Hirotaka Matsumoto
Guru 27595 points

Part Number: AM69A
Other Parts Discussed in Thread: DRA821U, DRA821

Hi all

Would you mind if we ask high speed IF with Jacinto AM69A or DRA821U?

<Question1>
We think AM69A has 10Gb USXGMII IF.
Is there any restriction using another high speed IF(e.g. PCIe gen3) if we use 10Gb USXGMII or 5Gb XFI?

<Question2>
We think DRA821U has the same Ethernet port. Is there any restriction the same as AM69A?

Kind regards,

Hirotaka Matsumoto 

  • +1
    TI__Mastermind 43420 points

    Hi Hirotaka-san

    Hirotaka Matsumoto said:
    We think AM69A has 10Gb USXGMII IF.
    Is there any restriction using another high speed IF(e.g. PCIe gen3) if we use 10Gb USXGMII or 5Gb XFI?

    You can use PCIe gen3 with 10G or 5G ethernet.

    In general, use of high-speed interfaces is dependent on the configuration of serdes lanes. If you see in serdes lane description (TRM section 12.2.5.1.3.1.1 @ https://www.ti.com/lit/zip/spruj52 ), You will be able to see all the high speed protocols which can be supported simultaneously. Each serdes lane can only have 1 protocol.

    Hirotaka Matsumoto said:
    We think DRA821U has the same Ethernet port. Is there any restriction the same as AM69A?

    Similarly for DRA821, The TRM (section 12.2.5.3.1.1 @ https://www.ti.com/lit/pdf/spruiu1 ) details the interfaces which can be used simultaneously are defined by which protocols are running on serdes. The limitation being here that one serdes instance can only run 2 protocols. For eg, serdes0 on DRA821 can run any 2 of PCIe, SGMII (or USXGMII or QSGMII or XAUI or XFI) or USB protocols as it only has 1 serdes instance. Where as AM69A has 4 serdes and it can run upto 2 protocol on each serdes.

    Regards,
    Tanmay