Forum Discussion

opexsys's avatar
opexsys
Icon for New Contributor rankNew Contributor
2 months ago
Solved

Interfacing Avalon Streaming FIFO IP with GTS Ethernet Hard IP (Agilex 5, quartus v25.3)

Hello, I posted this question before on the Quartus Prime Forum but saw this forum and thought maybe this would be a better place to post it. Sorry if this is considered spam and not allowed: I ...
Ethernet
Transceiver
  • ChrisR_Altera's avatar
    ChrisR_Altera
    1 month ago

    Looking at the design, it doesn't appear the rx_status signals are needed.   The routing is just using the IP address.

    As for start/end of a packet for rx_status, you can use the endofpacket signal from rx_data.   

ChrisR_Altera's avatar
ChrisR_Altera
Icon for Occasional Contributor rankOccasional Contributor
2 months ago

To interface the rx status and the sc fifo, you should uncheck "use packets" and leave the SC FIFI ready signal unconnected (as the RX side doesn't support backpressure).   This means you need to process the frames at datarate.

For how to handle this interface, I would take a look at the following section:

https://docs.altera.com/r/docs/817676/25.3.1/gts-ethernet-hard-ip-user-guide-agilextm-5-fpgas-and-socs/connect-the-rx-mac-avalon-streaming-client-interface

Depending on your application, the rx status may not be required.   If you are doing specific processing for VLAN/SLAN, PAUSE/PFC, Control, or Broadcast/Multicast frames, then this would be required.

  • opexsys's avatar
    opexsys
    Icon for New Contributor rankNew Contributor
    1 month ago

    Hi Chris,

    Thank you for the reply! A few follow-up questions:

    1. Can the rxstatus signals be not connected at all ? I am trying to add on to this design (Design Link: https://altera-fpga.github.io/rel-25.3/embedded-designs/agilex-5/e-series/modular/ethernet/agx5e-ethernet-10g/ug-agx5e-ethernet-10g/). Will not connecting it cause any system issues?

    2. If I uncheck use packets parameter, how does the system figure out start and end of every packet? I am trying to do packet processing.

    Thank you again

    • ChrisR_Altera's avatar
      ChrisR_Altera
      Icon for Occasional Contributor rankOccasional Contributor
      1 month ago

      Looking at the design, it doesn't appear the rx_status signals are needed.   The routing is just using the IP address.

      As for start/end of a packet for rx_status, you can use the endofpacket signal from rx_data.   

      • opexsys's avatar
        opexsys
        Icon for New Contributor rankNew Contributor
        1 month ago

        Thank you for the help Chris! I appreciate it, your response is helpful!

    • paveetirrasrie_Altera's avatar
      paveetirrasrie_Altera
      Icon for Frequent Contributor rankFrequent Contributor
      1 month ago

      Hello,

       

      I’m glad that your question has been addressed, I now transition this thread to community support. 
      If you have a new question, feel free to open a new thread to get the support from Altera experts.
      Otherwise, the community users will continue to help you on this thread. 

       

      Thank you Chris for supporting!!!


      Thank you.