• State TI Thinks Resolved
  • Locked Locked
  • Replies 4 replies
  • Answers 2 answers
  • Subscribers 33 subscribers
  • Views 389 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.

LMH1219: IN0/1 and OUT0/1 mux issue

user6207280
Prodigy 30 points
Part Number: LMH1219

Hi, all

We have an issue with LMH1219 IN0/1 and OUT0/1 mux.

Here we set CTLE Page 0x31=3F to declare it is controlled by internal register.

Then we set CTLE Page 0x90=20, 0x1C=98, 0x 1E=29, 0x31=23 to let it input with IN1 and out put with OUT0 and OUT1;

Cable EQ Page 0x30=2A, 0x31=41, 0x32=2A, 0x33=41.

Test data rate is 11.88Gpbs on IN1.

It's very strange that OUT0 can normally output signal, but OUT1 cannot. Only when we connect the pin IN_OUT_SEL to high voltage with all the other hardware control pin float, OUT1 and OUT0 can both work well.

  • 0
    TI__Guru* 93670 points

    Greetings,

    Please note LMH1219 programming guide(SNLU187C) section 3.7.4. I believe you may not be setting reg 0x3F[4]. This section of the programming guide specifies register settings to enable IN1 to OUT0 and OUT1.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 30 points

    Hi, Nasser

    I read all the register from LMH1219 as follows. 0x3F=1E

    CTLE
    0003 4580 0000 0000 0000 501F 0800 9369
    27E0 A090 0000 2525 4000 A003 5800 0990
    0000 0040 4008 9200 0000 3000 7208 2406
    0000 1188 3F1F 1100 0000 0041 6100 801E
    0040 8050 C090 54A0 B095 69D5 99A5 E6F9
    0000 8000 0002 00A2 B095 E9D5 99A7 E6FB
    2631 703D FF00 0000 000A 441F 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000

    Cable EQ
    0884 043F 0000 A024 2701 0537 0125 3702
    0A02 0804 3C00 0008 0108 01A7 0000 0000
    00CA 0000 0000 0A00 0020 4089 0B20 0000
    2C60 2C60 1700 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000
    0000 0000 0000 0000 0000 0000 0000 0000

  • 0 in reply to user6207280
    TI__Guru* 93670 points

    Greetings,

    Could you please confirm if you have LMH1219 programming guide? Using these settings we are able to to enable both OUT0 and OUT1 . Your settings above are not the same as recommended register settings. We need to make sure you are using settings noted in the programming guide for this and other operations.

    Regards,, Nasser

  • 0 in reply to Nasser Mohammadi
    Prodigy 30 points

    Hi, Nasser

    I will re check the register with the programming guide and feed back to you later.