LVDS or LVDS_25 capability

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opp
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Joined: Tue Oct 19, 2021 2:02 am

LVDS or LVDS_25 capability

Post by opp » Mon Nov 15, 2021 6:34 pm

Dear RedPitaya team,

Can you advise on what differential signalling constraint be used to implement LVDS signalling on the PL I/O (E1) extension connector?

It appears as though the 3.3V Vcco prevents one from using the Zynq's internal differential termination i.e. DIFF_TERM=FALSE.

It seems from a previous reply that TMDS might work. Is this still the case? If that's the case am I just supposed to hack 50 ohm pull-ups from all the pins that I require differential signalling from?

And this termination should be Jerry-rigged at the E1 connectors correct?

If it is indeed the case that straight up LVDS (or even TMDS) cannot be used without such external intervention - then saying 'Differential signalling' on the schematic is incomplete. Some notes should be included on the details of how differential signalling may be implemented.

Opp

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