How do I assign an LVDS I/O standard in Quartus II design software to non-dedicated differential (psuedo differential) transmitters in Cyclone III and Stratix III devices?

There are 2 LVDS assignments in Quartus® II design software for non-dedicated differential pins, "LVDS_E_1R" for Stratix® III devices only, and "LVDS_E_3R" for both Stratix III and Cyclone® III devices.

The LVDS_E_1R is a solution that requires one external resistor and the LVDS_E_3R is a solution that requires three external resistors. For more information on these external resistor solutions, refer to Stratix III Device I/O Features (PDF) and High Speed Differential Interfaces in Cyclone III devices (PDF).

There is also more information on these assignments in the Quartus II software help.  In the help index, go to "I/O standards" and select "list of".