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Bin_Wang's avatar
Bin_Wang
Icon for New Contributor rankNew Contributor
4 years ago

SDI TX XCVR Failed to work

Hi, I am using the C10 GX105YF708 for SDI project. For unknown reason, when I have both HDMI+SDI Tx core in the project. The SDI tx_pll_locked and gxb_tx_ready will stay low.. HDMI TX core...
CheepinC_altera's avatar
CheepinC_altera
Icon for Regular Contributor rankRegular Contributor
4 years ago

Hi,


Thanks for your update. Regarding your latest observation on the following:


But if we download the same sof again.. SDI will be back to work.. Any thought?

[CP] Based on my experience, generally this observation happens to the system which the refclk or the CLKUSR is not available or stable during device power up. After the first power up, the XCVR is not properly calibrated and thus cannot function properly. With the second programming of the SOF, this time, the clocks are already stable, the calibration is successful and the XCVR will function properly.


Another case of this is some of the clock oscillators are programmed by the FPGA. These clocks are only available after FPGA is in user mode.


You can try a user recalibration to the SDI TX transceiver to see if it will bring it after the first SOF downloading.


Please let me know if there is any concern. Thank you.



Best regards,

Chee Pin



  • JLee25's avatar
    JLee25
    Icon for Contributor rankContributor
    4 years ago

    Hi Chee Pin,

    I think you suggestion to do the recalibration by following the XCVR UG, right!

    SDI did not have this interface opened by default, do you have any reference data for me?

    Besides to download the sof twice, we also noticed if we remove the HDMI IP.

    The SDI is always fine, it will start running the 1st time.

    Do you think what might be wrong?

    Thank you!

    Best Regards,

    Bin