LVDS output High Z or both to '0'

[Altera_Forum]

Hi, 

I have LVDS output.  Is there a any way to put both LVDS outputs to High-'Z' or either both driving '0' ?   -Tero

[Altera_Forum]

To my knowledge, no. If you have an output set in LVDS mode it always operates as a differential pair.

[Altera_Forum]

--- Quote Start ---  Hi, I have LVDS output.  Is there a any way to put both LVDS outputs to High-'Z' or either both driving '0' ?   -Tero  --- Quote End ---    Yes, you can disable (tri-state) LVDS outputs. You should be able to infer this in your HDL code or you could instantiate an Altera I/O buffer primitive (ALTIOBUF I think). You will need an output enable signal to enable/disable the output buffer. But as Galfonz said, you can't make an LVDS output buffer drive both sides low.

[Altera_Forum]

Tristateable Bus LVDS drivers are always emulated LVDS. There should be no basic problem (besides some timing drawbacks) to connect it trough logic gates. 

  --- Quote Start ---  Bus LVDS (BLVDS) output uses two single-ended outputs with the second output programmed as inverted.  --- Quote End ---  

[Altera_Forum]

Thanks, FvM, I didn't know that. To the OP, sorry for the misinformation (I was going from memory - always a mistake). 

 If you are able to add external components I've used M-LVDS transceivers from TI. Analog Devices also makes them I believe. They also provide some protection if the LVDS signals are going off-board.

[Altera_Forum]

That should work, but you won't be able to operate as fast as real hardware differential drivers (if that matters to you).