11 Replies Latest reply on May 7, 2012 9:23 AM by martin.maurer

    A lot "invalid frames" when using the FX3 at a high speed USB port

    martin.maurer

      Hello,

         

      at the moment i am trying to do my first steps in developing software for the FX3.

         

      I have an USB hardware analyzer, which i use to record traces of the communication between the PC and the FX3.

         

      This analyzer can only record USB high speed, so i use the FX3 at a USB 2.0 port with transmission speed "high speed".

         

      Already during downloading of an image i see a lot of "invalid frames" in the trace.

         

      Downloading itself works, because i think, USB is doing a lot checks and repititions, so error are corrects.

         

      Has someone a clue what it could be? I am using a FX3 with the VID=1480 / PID=0000 problem.

         

      Could it be a chip problem? Layout problem (it is a custom board)? What else?

         

      Has someone already taken USB hardware traces? Are there also "invalid frames" in your traces?

         

      (I have attached a zipped trace, which can be opened with software from http://www.ellisys.com)

         

      Best regards,

         

      Martin