DP83TG720EVM-MC: PHY register settings for media converter

Barry W

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,

over 1 year ago

0 David Creger over 1 year ago

TI__Mastermind 28502 points

Hi Barry,

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

Thanks,

David

+1 David Creger over 1 year ago in reply to David Creger

TI__Mastermind 28502 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

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DP83TG720EVM-MC: PHY register settings for media converter