• State
  • Locked Locked
  • Replies 3 replies
  • Subscribers 34 subscribers
  • Views 334 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.

DS34RT5110 interfaced with TMDS442

Todd Broceus
Prodigy 20 points

Other Parts Discussed in Thread: DS34RT5110, TMDS442

I'm currently working on a design utilizing the DS34RT5110 and the TMDS442.  My design involves multiple lengths of hops driven by a DS34RT5110, with each hop terminating into a TMDS442.  Using the TMDS442, I break out the signal so that one signal can be used locally and then I drive another hop with another DS34RT5110.  Depending on the scenario, the cable lengths between these hops can be any length, lets say from 4' up to 50'. My issue is that depending on the resolution of the signal (I am connecting these to computer outputs), the settings for the DS34RT5110 needs changed.  Is there a way to "autoconfigure" the DS34RT5110, to basically detect the best possible setting for the DE and EQ lines?  With the data rate depending on the resolution and the color level, I'm finding that just about each resolution leads to different settings for the DS34RT5110.

  • 0
    TI__Expert 3175 points

    Hi Todd,

    DS34RT5110 has a front end settable equalizer for compensating the loss over frequency characteristics of the HDMI cable connecting to its input. User needs to select the equalization setting suitable to the length of the cable. For your cable length of 4 - 50' (approx 1.5 to 15m), I believe you will need 2 settings at most, one for short (0-10m), and one for medium (10-15m). I suggest to choose the setting based on your highest resolution. The setting good for high resolution should be good for lower resolution. Since the equalizer is followed by a retimer on-chip, the setting is not critical even if it is not optimum.

    TK Chin

  • 0 in reply to T.K. Chin
    Prodigy 20 points

    This is not what I am seeing in my testing.  As the source resolution is changed, regardless of the cable length remaining the same, the settings need to be changed.  This is somewhat dependent upon the source of the signal. I have used at least 5 different video cards, and some of them will work fine at one resolution, but when changed to another resolution, the settings need changed.  Typically, it appears to be an issue going from 1920x1080 to 1680x1050.  For some reason, the higher resolution works better than the lower one.  And on all the machines, if you reboot the source when it is connected, the typical DOS output of 640x480 tears constantly.  Is there a way to speak to someone on the phone to discuss what I am seeing?

  • 0 in reply to Todd Broceus
    TI__Guru* 93570 points

    Hi Todd,

    You can send me email so we can discuss this further. Email address is: nasser.mohammadi@ti.com.

    Regards,,nasser