Article ID: 000087073 Content Type: Troubleshooting Last Reviewed: 08/20/2018

Why does the Intel® PCIe* Hard IP run into recursive replay timer timeout, replay num rollover and link recovery when sending traffic?

Environment

    Intel® Quartus® Prime Pro Edition
    Intel® Arria® 10 Cyclone® 10 Hard IP for PCI Express
    Arria® V GZ Hard IP for PCI Express Intel® FPGA IP
    Avalon-MM Stratix® V Hard IP for PCI Express Intel® FPGA IP
    Stratix® V Hard IP for PCI Express Intel® FPGA IP
    IP_Compiler for PCI Express
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Critical Issue

Description

You might see timeout, rollover, and recovery because of Start of Packet(SOP) pointer buffer overflow. The SOP pointer buffer can overflow during replay because of internal error message or TLPs submitted from user side for transmission when the following trigger conditions are met:

-     ACK packets are lost or not received by Intel® PCIe* Hard IP under a high bit error rate link conditions

-     Link partner is unable to ACK packets at regular intervals as per the spec for unknown reasons


If the above trigger conditions persists, then there are chances that internal SOP pointer buffer will reach the full condition. Every replay after this will cause overflow because of error message scheduling (Replay Timeout, Replay Num Rollover) or TLPs are submitted from user side for transmission.

Resolution

There is no workaround to this problem.

This problem will not be fixed in a future release of the Intel® Quartus® Prime software.

Related Products

This article applies to 7 products

Intel® Arria® 10 FPGAs and SoC FPGAs
Arria® V GZ FPGA
Stratix® V GS FPGA
Stratix® V GT FPGA
Stratix® V GX FPGA
Stratix® IV GT FPGA
Stratix® IV GX FPGA

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