Article ID: 000080662 Content Type: Troubleshooting Last Reviewed: 07/11/2019

Why is my Intel® Low Latency 40-Gbps Ethernet IP Core generating 66-byte flow control packets when Flow Control Mode is set to “Priority-based flow control” and the Number of PFC queues set to “8”?

Environment

  • Intel® Arria® 10 FPGAs and SoC FPGAs
  • Stratix® V GX FPGA
  • Stratix® V GS FPGA
  • Stratix® V GT FPGA
  • Intel® Quartus® Prime Pro Edition
  • Low Latency 40G Ethernet Intel® FPGA IP for Arria® 10 and Stratix® V
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    Critical Issue

    Description

    Due to a problem in the Intel® Quartus® Prime software, the Intel® Low Latency 40-Gbps Ethernet IP Core with “Priority-based flow control”enabled and the number of PFC queues set to “8” will generate 66-byte flow control packets. 

    Resolution

    To work around this problem, do not set the number of PFC queues to “8” in the GUI. Any other number of PFC queues is sufficient.

    This problem is not currently scheduled to be fixed in any future releases of the Intel® Quartus® Prime Software.

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