Agilex™ 7 F-Series and I-Series Known Issue List

ID 683584
Date 9/29/2025
Public
Document Table of Contents

2.1.2.16. Bifurcated ports using Independent PERST pins might fail to link up after configuration is complete

Description

When using Enable Independent PERST pins to implement bifurcated x8x8 ports in R-Tile Avalon Streaming IP for PCI Express in Endpoint mode, both ports might fail to link up under the following scenarios:
  • Scenario 1: When FPGA is configured with

    -refclk0 unavailable, i_pin_perst0_n deasserted (1’b1) and

    -refclk1 stable and free running, i_pin_perst1_n deasserted (1’b1) and

    -refclk2 stable and free running, i_pin_perst_n deasserted (1’b1),

    then Port 0 is expected to be in reset, while Port 1 fails to link up. Toggling the i_pin_perst1_n or i_pin_perst_n does not recover the link on Port 1. This issue is fixed in Quartus® Prime Pro Edition software version 24.3 (Port 0 in reset, Port 1 links up). To allow Port 0 to link up once the refclk0 becomes available after FPGA configuration is complete, you must toggle i_pin_perst0_n. Toggling the i_pin_perst_n causes both the links to fail link up and the FPGA must be reconfigured to recover from this state.
  • Scenario 2: When FPGA is configured with

    -refclk0 stable and free running, i_pin_perst0_n deasserted (1’b1) and

    -refclk1 unavailable, i_pin_perst1_n deasserted (1’b1) and

    -refclk2 stable and free running, i_pin_perst_n deasserted (1’b1),

    then Port 0 fails to link up, while Port 1 is expected to be in reset. Toggling the i_pin_perst0_n or i_pin_perst_n does not recover the link on Port 0. This issue is fixed in Quartus® Prime Pro Edition software version 24.3 (Port 0 links up, Port 1 in reset). To allow Port 1 to link up once the refclk1 becomes available after FPGA configuration is complete, you must toggle i_pin_perst1_n. Toggling the i_pin_perst_n causes both the links to fail link up and the FPGA must be reconfigured to recover from this state.

Impacted Modes

  • PCIe* IP in endpoint mode

Workaround

None.

Status

Table 42.  Device Status Table
Devices Affected Planned Fix
  • AGIx041R29xxxxxx
  • AGIx041R31Exxxxx
Quartus® Prime Pro Edition software version 24.3