Article ID: 000083607 Content Type: Troubleshooting Last Reviewed: 05/09/2023

Why does the Quartus II fitter report display "unused" in the Termination column when applying the LVDS I/O standard to REFCLK pins in Intel® Arria®10 devices?

Environment

BUILT IN - ARTICLE INTRO SECOND COMPONENT
Description

Due to a bug in Quartus® II software version 14.1, the fitter report displays "unused" in the Termination column of Intel Arria 10 devices when both of the following conditions are true:

  • Applying the LVDS I/O standard to the dedicated REFCLK pins
  • Setting the dedicated REFCLK pin XCVR_A10_REFCLK_TERM_TRISTATE = TRISTATE_OFF .qsf assignment

The fitter report should display tristate_off.

Resolution
This problem is rebuilt in v15.0.

Related Products

This article applies to 3 products

Intel® Arria® 10 SX SoC FPGA
Intel® Arria® 10 GX FPGA
Intel® Arria® 10 GT FPGA