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SGMII MAC switching

Taras Kolesko
Expert 1730 points

Other Parts Discussed in Thread: TMS320C6670

Hello again.

I'm using evalutation board TMDSEVM6670L with TMS320C6670 processor. I've found that it has 2 SGMII port, with specific MAC-address for each. Why, when i set Ethernet boot mode, i see only SGMII_1 MAC-address, but don't see SGMII_0 ? Is it possible to change logic of the MAC packets, or switching off SGMII_1. Moreover, can ethernet boot work with SGMII_0?

  • 0
    TI__Guru* 81335 points
    Hi Taras,
    I'm using evalutation board TMDSEVM6670L with TMS320C6670 processor. I've found that it has 2 SGMII port, with specific MAC-address for each.

    Each device will consume only one MAC address. Please refer the section "Gigabit Ethernet (GbE) Switch Subsystem" of data manual for more information.

    Why, when i set Ethernet boot mode, i see only SGMII_1 MAC-address, but don't see SGMII_0 ? Is it possible to change logic of the MAC packets, or switching off SGMII_1. Moreover, can ethernet boot work with SGMII_0?

    In EVM, port 1 is connected to phy and port 0 is connected to AMC. Yes, In RBL both ports are enabled for booting. You can use either port 0 or port 1 for booting with same MAC address.

    Thank you.
  • 0 in reply to Raja
    Expert 1730 points
    There are some experiments i've made so far.
    I've connected PHY to AMC and turned board (still TMDSEVM6670l) into Ethernet boot mode. I've noticed that board sending MAC declared on MAC1 Source Address (SGMII_1). But i was expecting SGMII_0 MAC, because i've connected to SGMII_0. What's going on in this process?
  • 0 in reply to Taras Kolesko
    TI__Guru* 81335 points

    As i mentioned in the previous post, there is a MAC address associated for each device that is C6670/78/57 DSP's. The RBL does not populate separate MAC address for each port so the application running on the device should take care of it.

    I think it is the expected behavior. I hope this clarifies your query.

    Thank you.

  • 0 in reply to Raja
    Expert 1730 points
    Ok, thank you. I'll try to work with there restrictions.