Article ID: 000078000 Content Type: Troubleshooting Last Reviewed: 08/29/2012

Why is rx_signaldetect always stuck high in hardware and stuck low in simulation for Arria II GX devices?

Environment

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

    You may see rx_signaldetect stuck high in hardware and stuck low in simulation in ALTGX Basic mode for Arria®  II GX devices.  This issue is observed in Quartus II 10.1 or 10.1sp1 software, due to a bug.  In order to fix the simulation issue, you can install patch 0.63 in Quartus II 10.1 or 10.1sp1 software versions.

    In order to fix the hardware issue in Quartus II 11.0 and later software versions, you can

    1.  Add the following variable to the project QSF file.

    set_instance_assignment -name ARRIAIIGX_RX_CDR_LOCKUP_FIX_OVERRIDE ON -to rx_datain[0]

    Where rx_datain[0] is the RX channel net name using rx_signaldetect signal (e.g. SAS/SATA channel). 

    2. Apply the reset sequence described in solution rd11012010_759.

    Arria II GZ and other GX/GT devices are not affected by this issue.

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