Article ID: 000083607 Content Type: Troubleshooting Last Reviewed: 01/20/2016

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

Environment

  • Intel® Arria® 10 SX SoC FPGA
  • Intel® Arria® 10 GX FPGA
  • Intel® Arria® 10 GT FPGA
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 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 will be fixed in a future version of the Quartus II software.
 

Disclaimer

1

All postings and use of the content on this site are subject to Intel.com Terms of Use.