Article ID: 000075990 Content Type: Troubleshooting Last Reviewed: 08/27/2013

Is there a known issue with the LVPECL I/O assignment in the Quartus II software when targeting a Stratix V device?

Environment

  • Quartus® II Subscription Edition
  • BUILT IN - ARTICLE INTRO SECOND COMPONENT
    Description

    Yes, there is an issue with the LVPECL I/O assignment in the Quartus® II software when targeting a Stratix® V device. 

    The Quartus II software will not implement the "n" side of the LVPECL pair in versions 11.0, 11.0SP1 and 11.1.

    Resolution

    You can use the LVDS I/O standard instead of the LVPECL I/O standard because LVDS input buffers are used to support LVPECL input operations, but internal termination is not supported for the LVPECL standard.

    This issue is fixed in the Quartus II software version 11.1SP1.

    Related Products

    This article applies to 4 products

    Stratix® V GS FPGA
    Stratix® V GX FPGA
    Stratix® V GT FPGA
    Stratix® V E FPGA