Description
The value of the transceiver differential Rx On-Chip Termination (OCT) on Arria® II GX devices is the combination of the two single ended OCT resistors to the Vcm generator.
Figure 1-24 of the Arria II GX transceiver handbook shows the combined value of two individual single ended resistors
For example, each resistor is 50 Ohms making a combined value of 100 Ohms.