• State Resolved
  • Locked Locked
  • Replies 2 replies
  • Subscribers 33 subscribers
  • Views 872 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.

What's the function of Auto Detect and Manual RX-Detect for DS80PCI402SQE？

Jacky Chen29
Genius 4735 points
Other Parts Discussed in Thread: DS80PCI402

Hola,

May I know what's the different between Auto Detect and Manual RX-Detect？

And what do they do of these two function for DS80PCI402SQE？Thank you ～

  • 0
    TI__Mastermind 29655 points
    Hi Jacky,

    The function of Rx-Detect is to determine if there is a load connected AFTER the DS80PCI402 Tx. If there is no device attached to the other side of the DS80PCI402, the DS80PCI402 channel places the Input termination to Hi-Z, effectively turning off the channel.

    The difference between auto-detect and manual Rx-Detect is whether the user has control to force the input termination to Hi-Z or 50-ohms. In a typical PCIe system, we recommend leaving RXDET floating, as this allows the DS80PCI402 to send out a periodic pulse to check for a load, just like PCIe protocol specifies. Once a a load is detected (in other words, a valid 50-ohm load is present), the input termination changes to 50-ohms. In manual Rx Detect mode, the user must manually set the input termination to be Hi-Z or 50-ohms.

    Michael
  • 0 in reply to Michael Lu (Santa Clara)
    Genius 4735 points
    Hola Michael,
    Thank you very so much.