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Original question:

DS92LX2122: Issue with flickering display

DS92LX2122: How to disable the back channel. ?

Jonathan Brodeur1
Prodigy 20 points
Part Number: DS92LX2122

What is the register to desactivate the back channel to be able to make the eye diagram ?

  • 0
    TI__Mastermind 25735 points

    Hi Jonathan,

    There is a mode that provides a loop through output of the recovered forward channel after EQ equalization and prior to the CDR block. This signal will not have the backchannel, so you will be able to see an eye diagram. The loop through driver is accessed via the RES pins 38 and 39 (CMLOUTP and CMLOUTN, respectively). To enable the CMLOUT pins, program register 0x3F[4] = 0 (CMLOUT enabled).

    Regards,

    Ben