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TMDS141

Ramon Huang
Prodigy 20 points

Other Parts Discussed in Thread: TMDS141

Dear Sir

We have a question to ask about TMDS141. Can we swap pin each one set??

ex. RX0+ / TX0+, RX0- / TX0- pin name but we connect RX1+ / TX1+, RX1- / TX1-

Thanks,

Ramon

  • 0
    TI__Guru* 76130 points

    Hello,

    I don't fully understand your question, can you put a block diagram?

    You can swap plus/minus at both sides of the TMDS141.

    Regards.

  • 0 in reply to Elias Villegas M.
    Prodigy 20 points

    Dear Sir

    Thanks for your answer. I have an other issue.

    How long Differential Signal (max.) for TMDS141 to connector??

    I have a design, Intel Ivy bridge with H61, the Differential Signal is total 9.3" to board to board connector. Now, I have a design for I/O board. The TMDS141 input Differential Signal is about 2" (It is total under 12" for chipset design guideline), but output Differential Signal to HDMI connector is about 13.4"-13.6". Is it okay??

    Thanks,

    Ramon

  • 0 in reply to Ramon Huang
    TI__Guru* 76130 points

    Hello,

    13" of trace length is too long, you may have signal integrity issues, I recommend you to place the TMDS141 half way the distance so you can have about 7" at both sides, even with 7" you have to do a very clean design. 

    Generally, we recommend to keep the maximum trace length under ~5 inches.  FR4 material is generally fairly lossy at higher frequencies which increases signal attenuation.  If the intra-pair trace lengths are tightly matched, and care should be taken to route the signals away from noise sources the 7 inch trace length should be ok to use.  We would also recommend possibly using a guard trace on both sides of each twisted pair is room allows. 

    Regards.