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DP83TG720EVM-MC: Connecting two DP83TG720EVM-MC kits back to back with two PCs

Nadeem Masood
Prodigy 40 points
Part Number: DP83TG720EVM-MC

Hi,

I want to use two of the above kits in back to back to back mode to connect between two PCs with RJ45.

So one PC with RG45 is connected to one of the kits. That kit is connected with the other kit using the automotive cable provided in the kit. The second kit is connected to another PC:

PC1 ----> DP83TG720EVM-MC ---------> automotive cable ------> DP83TG720EVM-MC  ----------> PC2

I assigned static addresses 192.168.1.1 and 192.168.1.10 to each PC respectively.

Also connected micro USB cable to each kit to provide power - green LEDs turn on in each.

Now if I do a ping from PC1 to PC2 or vice versa, it does not work. Does that mean that above setup is not possible or do I need to do something else also?

Also I see address 192.168.1.2 assigned to some thing as ping to that worked. Is this the address of the kit itself?

Regards

Nadeem

 

  • 0
    TI__Mastermind 19621 points

    Hi Nadeem,

    This setup is definitely possible, there must be an error somewhere in the set up.

    The first thing I would check would be if the 867 and 720 have established link or not, this can be done by reading Register 0x0001; Bit 2.

    • If you read a '0' then there's the problem. It is not establishing link properly.
    • If you read a '1' then that isn't the problem. 
      • I would start setting up Loopback tests to see which link is failing.

    PC1 -> [867 to 720] ->Automotive Cable -> [720 to 867]-> PC2

    Regards,

    Alvaro

  • 0 in reply to Alvaro (Al-vuh-roe) Reyes
    Prodigy 40 points

    Hi Alvaro,

    I checked the above register. It is 0145 in the kit connected to PC1 but 0141 in the kit connected to PC2.

    All physical connections seem to be correct. What can the reason for getting 0141?

    Regards

    Nadeem

  • 0 in reply to Nadeem Masood
    Prodigy 40 points

    Now I am getting 0141 on both kits! Is the Register 0x0001 Bit 2 showing status of the physical link (the automotive wire between the two boards)?

  • 0 in reply to Nadeem Masood
    TI__Mastermind 19621 points

    Hi Nadeem,

    Were these configured as Master and Slave? Two Masters or Two slaves would cause an issue. I believe the J2 pin on the 720 EVM can change this (Please confirm with the 720 EVM Document).

    How long of a cable are you using? What type of cable is it? UTP or STP?

    Also, try reading register 0x0001 multiple times to confirm link is down or up.

    Register 10h can also provide a more dynamic link status.

    Regards,

    Alvaro

  • 0 in reply to Alvaro (Al-vuh-roe) Reyes
    Prodigy 40 points

    Hi Alvaro,

    Both were configured as slave. Now I changed one of them to master and getting 0145 value in both.

    But ping between the two PCs is still not working.

    I have set IP address of PC1 to 192.168.1.1 and of PC2 to 192.168.1.10.

    Is ping expected to work?

    Regards

    Nadeem

  • 0 in reply to Nadeem Masood
    Prodigy 40 points

    There was an issue with my Windows firewall configuration. After disabling that, ping is working. Thanks for your help.