Stratix V Avalon-MM Interface for PCIe Solutions: User Guide

ID 683411
Date 5/21/2017
Document Table of Contents

5.8. Programming Model for Avalon-MM Root Port

The Application Layer writes the Root Port TLP TX Data registers with TLP formatted data for Configuration Read and Write Requests, Message TLPs, Message TLPs with data payload, I/O Read and Write Requests, or single dword Memory Read and Write Requests. Software should check the Root Port Link Status register (offset 0x92) to ensure the Data Link Layer Link Active bit is set to 1'b1 before issuing a Configuration request to downstream ports.

The TX TLP programming model scales with the data width. The Application Layer performs the same writes for both the 64- and 128-bit interfaces. The Application Layer can only have one outstanding non-posted request at a time. The Application Layer must use tags 16–31 to identify non-posted requests.

Note: For Root Ports, the Avalon-MM bridge does not filter Type 0 Configuration Requests by device number. Application Layer software should filter out all requests to Avalon-MM Root Port registers that are not for device 0. Application Layer software should return an Unsupported Request Completion Status.