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Altera_Forum
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16 years ago

Stratix III LVDS OCT

Hello! I am using stratix III and I have a few questions about LVDS and OCT in stratix III and I/O buffers. 1. If we want to use dynamic termination, can we use differential mode? a. ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

Hi,

I know that we just need the termination in the receiver side but i am using two fpgas and they communicate over the same differential pair.

I have transmitter and receiver (transceivers) in both fpgas and i am using bidirectional io buffer in differential mode, therefore I don`t want to have a permanent resistance of 100 ohm in each side. because then i have a 50 ohm equivalent, which is not the case that I want.

I think it is not possible to have dynamic termination for LVDS, so may be the best solution is to use external termination that can be turned on and off.

Thanks for your prompt reply.

I will be happy to hear other ideas and replies.