8 Replies Latest reply on Mar 22, 2019 9:48 AM by alamandaa_16

    Hardware diagnostic on boards using CYUSB3014




      We are using Cypress' CYUSB3014 on a new board we're currently developing.


      On our latest assembly run, we have a number of boards that are failing to be recognized by a PC.  What i've noticed are:

      - no FX3 UART activity

      - pclk (GPIO_16) doesn't toggle

      - DP line toggles when USB cable is hooked up, then goes to 3.3V.  On working boards, DP goes to 0V.


      Power supply levels are clean. Clock input is OK at 26Mhz .  Reset input is high.


      Any suggestion on how i can debug/diagnose the problem?


      Many thanks!