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schlee68's avatar
schlee68
Icon for New Contributor rankNew Contributor
4 years ago

LVDS Serdes

Hi-

Serdes input is 40 bits.

Read this 40bit from ROM and enter it into Serdes

"101010.....1010" It's okay

if you type it like this "00000000000000000000000000000111111111111111111111" If you enter this way, the following waveform appears.

I'm use 2GHz Serdes

How to make 00......000 flat, 111....11 flat

3 Replies

  • AqidAyman_Altera's avatar
    AqidAyman_Altera
    Icon for Regular Contributor rankRegular Contributor
    4 years ago

    As we do not receive any response from you on the previous question/reply/answer that we have provided, please login to ‘https://supporttickets.intel.com’, view details of the desire request, and post a feed/response within the next 15 days to allow me to continue to support you. After 15 days, this thread will be transitioned to community support. The community users will be able to help you on your follow-up questions.


  • AGORS5's avatar
    AGORS5
    Icon for New Contributor rankNew Contributor
    4 years ago

    Hi,

    Are you using Dev kit or own hardware ?

    I am asking cause it looks like cold junction between chip and PCB.

    So called head-on-the-pillow issue.

    In other words , there is no connection between fpga and pcb.

    There is samall capacitance between fpga ball and pcb - few pF.

    That's why you can see spikes instead of square wave.

    Try with other pin on the same chip or another unit.

    Best regards

    Adam Górski