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AM2432: Ethernet PHY and MUX

Mari Tsunoda
Expert 5726 points
Part Number: AM2432

Hi Team,

My customer is using the LaunchPad has a question regarding the ethernet PHY connections and connecting its signals to a MUX.

The LP User Guide (www.ti.com/.../spruj12) on pg. 31 shows that one PHY has an external MUX and the other is internally multiplexed.

If they were to connect the signals as follows, would it still be able to connect?

Best regards,

Mari Tsunoda

  • 0
    TI__Expert 5726 points

    Hi,

    Can I get any update on this?

    Best regards,

    Mari

  • +1 in reply to Mari Tsunoda
    TI__Mastermind 22685 points

    Hi Mari,

    Apologies for the slow response, this thread go lost somehow.

    I think your drawing above has a typo since both ethernet interfaces on the AM243x are PRG1_CPSW_RGMII2.  I think the lower interface should be PRG1_CPSW_RGMII1.  Assuming that is the case, are you asking if the customer can bypass the mux and connect the second phy directly to the PRG1 RGMII pins on the AM243?  If so, then the answer is yes.  The mux on the LaunchPad is just there to allow the user to select either the PRG1 or the CPSW pins which are pinmuxed to separate pins for RGMII1 on the AM243x device.  The mux is not needed on the LaunchPad for the RGMII2 interface since both the PRG1 and the CPSW pins are pinmuxed on the same pin on the AM243x device.  If your customer knows which RGMII1 connection they want to make (either to CPSW or PRG1), they can directly tie the phy to these pins on the AM243x without the need for a mux in their schematic.

    Thanks,
    Mike

  • 0 in reply to Mike Pridgen
    TI__Expert 5726 points

    Hi Mike,

    Thanks for your response! No worries.

    Yes, sorry for the typo the bottom interface should be PRC1_CPSW_RGMII1 as you said.

    I will relay this information to my customer and mark it as resolved once they respond!

    Thank you for your support!

    Best regards,

    Mari