Article ID: 000075350 Content Type: Troubleshooting Last Reviewed: 01/23/2018

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

Environment

  • Intel® Arria® 10 FPGAs and SoC FPGAs
  • Intel® Quartus® Prime Pro Edition
  • RapidIO II (IDLE2 up to 6.25 Gbaud) Intel® FPGA IP
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    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.

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