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Altera_Forum's avatar
Altera_Forum
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14 years ago

LVDS and Arria II Gx

Hi Everyone, I was wondering if anyone could explain to me how the LVDS works with Arria II Gx, especially when LVDS is used as an input. Let's say I have a differential LVDS clock connect...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
14 years ago

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Thank you for your answer but I spoke with an Altera FAE, and for LVDS, we do not need to use the Rup and Rdn pins for LVDS OCT. We only need to connect VCCPD and VCCIO to 2.5V.

Also not all pins support OCT on LVDS.

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Thanks for the feedback.

Did you try using Quartus? It would have essentially told you the same thing. This saves having to ask an FAE too.

I would double-check the VCCPD advice. In the Stratix II design here:

http://www.ovro.caltech.edu/~dwh/carma_board/

I used a lot of LVDS, but VCCPD was connected to 3.3V.

I have not used the Arria II devices. Review the recommendations for VCCPD.

Cheers,

Dave