• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 33 subscribers
  • Views 154 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.

DS110DF111EVM: 10KR to SFP Conversion help

Ari Hendler
Prodigy 50 points
Part Number: DS110DF111EVM
Other Parts Discussed in Thread: DS110DF111

Tool/software:

There are multiple posts in the TI forums that say you can use the DS110DF111 to convert 10KR to SFP. They are all stunningly devoid of any information on how to do it. I have a DS110DF111EVM board with 10KR going in and SFP coming out and nothing is happening.

  • 0
    TI__Mastermind 27700 points

    Hi Ari,

    DS110DF111 should be able to act as a 10G-KR to SFP bridge without any special settings. The only requirement is to disable link training and auto-negotiation on the 10G-KR side.

    Note that DS110DF111 is a protocol agnostic retimer which equalizes, slices, and drives the input signal to the output. It does not support 10G-KR feedback protocols and will simply pass data signals between the 2 sides after applying signal conditioning techniques. DS110DF111 can bridge between 10G-KR and SFP because these interfaces are electrically identical.

    Allow me to help debug why your setup isn't working.

    • Can you share a simple block diagram showing how you are connecting the EVM within your system?
    • Can you share any register settings or non-default configurations you are using?
    • Are you using SigCon Architect GUI with your EVM? Do you see signal detect and CDR lock on both channels during operation?
    • If you are not using SigCon Architect, can you read channel registers 0x02 and 0x54 on both channels during operation and share the values with me?

    Best,

    Lucas

  • 0 in reply to Lucas Wolter
    Prodigy 50 points

    1. So far, we've only used the default register values. 

    2. We are not using SigCon Architect, but we plan on hooking up a Raspberry Pi to read/write registers. I will have to get back to you on the register values.

    3. We see both LEDS turn on

    4. We will figure out how to turn off LT and AN on the SBC.

  • 0 in reply to Ari Hendler
    TI__Mastermind 27700 points

    Hi Ari,

    Thank you for answering my questions and sharing a bit more information about your setup.

    Since LT and AN are still enabled on the SBC, this is likely the reason you aren't seeing linkup. The SBC is expecting to complete AN and LT before starting data transmission, however the DS110DF111 does not participate in or pass through these protocols.

    Let me know if you are still having issues after disabling AN and LT.

    Best,

    Lucas