• State
  • Locked Locked
  • Replies 1 reply
  • Subscribers 33 subscribers
  • Views 112 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

DP83TG720S-Q1: Single Pair Ethernet Signal Chain - Connection Detection

Saber Kaygusuz
Prodigy 30 points
Part Number: DP83TG720S-Q1
Other Parts Discussed in Thread: DP83867E

Tool/software:

Hi Community,

I have a short question regarding my design for a SPE interface where I'm using the DP83TG720S-Q1.

The signal path is the following:

NVIDIA Jetson <--> Realtek Chip (PCI)

Realtek Chip <--> DP83867E (4 Lane Ethernet)

DP83867E <--> DP83TG720S-Q1 (RGMII)

DP83TG720S-Q1 <--> Connector (Single Pair Ethernet)

My design works and I get good data rate performance when testing the SPE.

The only thing where I'm still a bit uncertain about is, when I unplug the SPE cable the OS on the Jetson says that a connection is available, even if it is disconnected. When I boot the Jetson without an SPE cable attached, the OS shows that there is no connection, and when I plug in the cable the connection appears as it suppose to be.

The question I'm asking me is if this behavior can be fixed somehow, or if it is caused by all the components in the signal chain. I have to use this architecture to interface SPE, there is no other way to realize this in our system.

Does someone have experience with this?

Thanks a lot.

Regards Yannik

  • 0
    TI__Mastermind 26752 points

    Hi Yannik,

    I am not familiar with the NVIDIA Jetson, do you know how this device is determining connection availability? Is it reading a register of the PHY? Perhaps it is determining connection is available based on the DP83867 link status, rather than the SPE link status.

    Thanks,

    David