12 Replies Latest reply on Mar 11, 2020 12:13 AM by LeGa_3963206

    Clean FX3 on custom board: VID=0x0000 and Device Descriptor Request Failed

    LeGa_3963206

      Hello,

       

      We are developing custom board with FX3. We took as example SuperSpeed Starter Kit schematics

      In both modes I2C boot to USB fallback and USB boot devices enumeration occures: VID=0x000, PID=0x0002.

      Currently our I2C EEPROM is empty.

       

      So far we checked:

           - AN70707

           - AN76405

       

      PMODE[2:0] checked:

           - Z11

           - 1ZZ

           - Z1Z

       

      Also external crystal is OK - 19.2MHz

      All VDD, VIO, etc.. also good

       

      Is there anything else that should be checked?

       

      Thanks