Deciphering the PIDX Update Mechanism in a QDMA Subsystem for CPM5ΒΆ

  • The blog in the link below aims to provide a conceptual grasp of the PIDX update mechanism, focusing on key aspects such as:

    • Ring Size (Queue Size)

    • The maximum value of the initial PIDX Update

    • The Status field in the Queue

    • The correlation between CIDX value and the number of descriptors that software can purge from the queue

    • Wrap-around and error scenarios in subsequent PIDX update values

    • Tracking PIDX updates in the Traffic Manager interface etc.

https://adaptivesupport.amd.com/s/article/Deciphering-PIDX-Update-Mechanism-in-QDMA-Subsystem-for-PCI-Express