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Altera_Forum
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18 years ago

LVDS I/O termination

Is an external 100Ohm resistor required at the input of an LVDS receiver I/O pair for the Cyclone III devices? The literature seems to suggest yes and no. Also, if I have "rx_in" as a single-channel ...
Altera_Forum's avatar
Altera_Forum
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18 years ago

Stratix and Arria have on-chip differential termination, Cyclone III (as other Cyclone family chips) hasn't. Where do you see a different statement in device literature?

The inverted input is assigned by the fitter automaticly, as you said. You have a single rx_in port pin representing the differential pair.