Why does the Intel® Quartus® Prime fitter assign the RapidIO II IP Core transceiver RX On-Chip termination with r_r2?

Description

The Intel Quartus Prime fitter can incorrectly assign RapidIO II IP core transceiver RX On-Chip termination resistor with r_r2 (85ohm) when correct parameter is r_r1 (100ohm).

If following conditions are met, design can be at risk. 

• Design implements RapidIO II IP core.
• Intel Arria 10 engineering sample device with part number that ends with ES or E2. (Production devices are not affected)
• Intel Quartus Prime versions prior to v16.1.

Workaround/Fix

To work around this problem:
Manually add an RX termination assignment in the Quartus Settings File(.qsf)
    set_instance_assignment -name XCVR_A10_RX_TERM_SEL R_R1 -to <xcvr RX serial data name>

This problem has been fixed starting in Intel Quartus Prime software version 16.1.