• State TI Thinks Resolved
  • Locked Locked
  • Replies 3 replies
  • Answers 1 answer
  • Subscribers 33 subscribers
  • Views 123 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.

TMDS1204: tmds1204

Vaishnavi P
Prodigy 110 points
Part Number: TMDS1204


Tool/software:

Hi Team,
I am using TMDS1204RNQR Retimer IC in my project.
And my FPGA supports like when the Cable detect (Rx detect) should go first from the Source (Laptop) to the retimer IC to the SOC using HDMI RX connector.

After Cable detect indication, my SOC should send the HPD signal and EDID value to the HDMI Rx connector, after this SIGDET signal indication will come. The HPD signal condition is Active Low for working board scenerio.
Now Can I able to use without RX detect signal, will any Register option is provided on the Retimer IC or any method to enable the SIGDET signal pin indication??

Regards,
Vaishnavi

  • 0
    TI__Guru**** 182311 points

    Vaishnavi

    There is an app note on the usage of the TMDS1204 SIGDET function. 

    When standby is enabled and swap is disabled, the TMDS1204 waits for a signal on either IN_CLK (if HDMI 1.4 or 2.0) or IN_D2 (if HDMI 2.1). When standby is enabled and swap is enabled, the TMDS1204 looks for a signal on either IN_CLK (if HDMI 2.1) or IN_D2 (if HDMI 1.4 or 2.0). The TMDS1204 is fully functional when a signal is detected. If no signal is detected, then the device reenters standby state waiting for a signal again.  In I2C mode, standby can be disabled by setting the STANDBY_DISABLE register mode, but there is no specific register to enable/disable the SIGDET function.

    There is a SIGDET_TH_CFG register which you can use to set the SIGDET voltage threshold.

    Thanks

    David

  • 0 in reply to David (ASIC) Liu
    Prodigy 110 points

    Hi David, 
    Even I am not connected the RX detect pin.
    If RX detect or cable detect happens then only we can use that SIGDET pin right. Please clarify.
    Regards,
    Vaishnavi

  • 0 in reply to Vaishnavi P
    TI__Guru**** 182311 points

    Vaishnavi

    Correct, you can only use SIGDET pin to detect the presence of input signal.

    Thanks

    David