18.104.22.168. Configuration TLP
The P-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 PCIe configuration space in the P-Tile PCIe Hard IP, 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 the section Hard IP Reconfiguration Interface (User Avalon® -MM Interface).
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