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DRA821U: 3 x RGMII can be used with PCIe AND USB in DRA821u?

Part Number: DRA821U
Other Parts Discussed in Thread: DRA821

Dear Champs,

Can 3 ports of RGMII in CPSW5G be worked with PCIe and USB concurrently in DRA821u?

I found SGMII can not be worked with USB and PCIE concurrently as all these shared total of 4 SerDes lanes.

And also, there is no mentioned about RGMII in the CPSW5G of Table 6-1 DRA821 datasheet as below, and it looks RGMII is only supported on CPSW2G.

So, I would like to check if RGMII can be supported on DRA821u, and 4 ports of RGMII can be used with PCIE and USB concurrently.

When I checked it on pinmux tool, there was no issue to use 3 x RGMII with 2 lanes of PCIe and USB.

And also, is it possible to use Tagged 100 VLAN while other 2 ports will be used as Untagged VLAN in CPSW5G of DRA821u as below?

Of course, PCIe and USB should be run concurrently in this case.

Thanks and Best Regards,

SI.

  • Hi,

    > Can 3 ports of RGMII in CPSW5G be worked with PCIe and USB concurrently in DRA821u?

    TI> No. Currently the limitation is on SERDES usage as you yourself mentioned.

    > And also, there is no mentioned about RGMII in the CPSW5G of Table 6-1 DRA821 datasheet as below, and it looks RGMII is only supported on CPSW2G.

    TI > No, all 4 ports of CPSW 5G are RGMII capable. Please refer to Section 12.2.2 of the TRM

    >And also, is it possible to use Tagged 100 VLAN while other 2 ports will be used as Untagged VLAN in CPSW5G of DRA821u as below?

    TI > I will check and get back to you on this

    Regards

    Vineet

  • > Can 3 ports of RGMII in CPSW5G be worked with PCIe and USB concurrently in DRA821u?

    TI> No. Currently the limitation is on SERDES usage as you yourself mentioned.

    But, when I checked it pinmux tool, there is no issue to use 3 x RGMII with 2 lanes of PCIe and USB as below.

    Even when there is no issue in pinmux, RGMII should not be used with both of PCIe and USB3?

  • Hi,

    >But, when I checked it pinmux tool, there is no issue to use 3 x RGMII with 2 lanes of PCIe and USB as below.

    My apologies, I mixed up SGMII with RGMII. Since RGMII does not use the SERDES, there shouldn't be any issue with using it in conjunction with PCIe and USB.

    Regards

    Vineet

  • Hi,

    >And also, is it possible to use Tagged 100 VLAN while other 2 ports will be used as Untagged VLAN in CPSW5G of DRA821u as below?

    Yes, this use-case is possible. You can configure a port mask when adding a VLAN ID in ALE

    Regards

    Vineet