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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
Icon for Honored Contributor rankHonored Contributor
18 years ago

Thanks. In the Cyclone III Device Handbook, High Speed Differential I/O section, it was not clearly stated that an external 100Ohm resistor was required at the input of the LVDS receiver pins. There are clear statements about the requirement of external resistor networks for LVDS transmitter.