R-tile Avalon® Streaming Intel® FPGA IP for PCI Express* User Guide

ID 683501
Date 3/28/2022
Public

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3.3.4.1. Configuration TLP

The R-tile IP forwards any received Type0/1 Configuration TLP to the Avalon® -ST RX streaming interface. User’s logic has the responsibility to respond with a Completion TLP with a Completion code of Successful Completion (SC), Unsupported Request (UR), Configuration Request Retry Status (CRS), or Completer Abort (CA).

If a Configuration TLP needs to update a register in the Lite PCIe configuration space in the R-tile PCIe Hard IP (shown in the figure below), you need to use the User Avalon® -MM interface.

The application needs to prevent link programming side effects such as writing into low-power states before sending the Completion associated with the request. The application logic can check the TX FIFO empty flag in the tx_cdts_limit_o after the Completion enters the TX streaming interface to confirm that the TLP has been sent. For more details on the User Avalon® -MM interface, refer to Hard IP Reconfiguration Interface.

Figure 17. Configuration TLP Received by R-tile IP for PCIe Targeting the Hard IP Internal Registers

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