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AGofs's avatar
AGofs
Icon for Occasional Contributor rankOccasional Contributor
7 years ago

LVDS and emulated LVDS outputs

Hi everyone,

I'm sending out from FPGA a lot of signals at LVDS with low data rate.

Is it possible to use both true LVDS transmitter channels and emulated LVDS output channels together as an output LVDS channels?

4 Replies

  • AGofs's avatar
    AGofs
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Hi everyone,

    Do you have something new about this issue?

  • JonWay_altera's avatar
    JonWay_altera
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    Hi @AGofs​ Theoretically possible depending on how low is your datarate. However, for the LVDS IP Core, you can give a quick try to assign part of the channels as True and the others as Emulated, and see if the fitter allows it.

  • AGofs's avatar
    AGofs
    Icon for Occasional Contributor rankOccasional Contributor
    6 years ago

    Hi JwChin,

    Thank you for your answer!

    I'll try to use LVDS_TX IP core to check if it is possible.

    But what will happen if resistor terminations (for LVDS emulated channels) will be removed?

  • JonWay_altera's avatar
    JonWay_altera
    Icon for Frequent Contributor rankFrequent Contributor
    6 years ago

    Let me put this answer in the right place: The RS and RP external resistors is to give an effective 100 ohm differential output impedance