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Original question:

DP83TG720EVM-MC: Make the EVM run without the MCU

DP83TG720EVM-MC: PHY register settings for media converter

Barry W
Intellectual 870 points
Part Number: DP83TG720EVM-MC

Tool/software:

We are also trying to implement a media converter with a DP83TG720R and a DP8367 pair.  It is very much like the DP83TG720EVM-MC.

We are loopback testing the chain from a PC and the RGMII interface between the two PHYs is suspect right now.

We have reviewed the list of recommended settings for the DP83TG720R in https://www.ti.com/lit/an/snla371b/snla371b.pdf

I am assuming those are the DP83TG720R registers configured by the MSP430 on the DP83TG720EVM-MC.

Are there any additional DP83TG720R registers configured by the DP83TG720EVM-MC software for this PHY/PHY RGMII mode?

Are there any additional DP8367 registers configured by the DP83TG720EVM-MC software?

If you can share any of the source code for the EVM software, I am happy to pick out the register settings myself.

Thanks,

  • 0
    TI__Mastermind 24711 points

    Hi Barry,

    Let me check on this and get back by end of week.

    Thanks,

    David

  • +1 in reply to David Creger
    TI__Mastermind 24711 points

    Hi Barry,

    On the DP83TG720EVM-MC, the MSP430 configures the DP83TG720 exactly according to SNLA371B as you have seen. The DP83867 is configured with only the following writes:

    0x18 = 0x6156 (To set LED functions)
    0x19 = 0x0044 (To set LED_2 as active-low)
    0x86 = 0x0077 (To set 2.0ns of skew on RGMII Tx and Rx signals. This could be avoided by correct bootstrapping).

    Thanks,

    David