Our customer, GCC who located in Taipei Taiwan, encountered an USB communication unstable issue. The application is plotter. Project status is P/R. The MCU is MK61FN1M0VMJ12.
We are helping them to find out the root cause. BTW, does anyone have our USB layout guide that we can provide the customer to refer ? Thanks.
The guide for general is acceptable, and for K61 is better.
For K61 USB module, there are some comments on my experience for your reference.
1. VOUT33 should has a bypass capacitor to ground.
2. As USB data signal lines are differential signals. So they are paralleled, same distance and same length.
3. If possible, it is better to keep other signals away from data lines.
Hope my reply can help you.