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1. General recommendations
At IC level, Eye Diagram is characterized on a specific reference resistor between USB_RREF and ground. Verify first that USB_RREF resistor is correctly connected and has proper value and precision (3kOhms 1%)
2. Eye Diagram
2.1. Common mode troubleshooting
Hardware root causes to investigate :
- Mismatch between D+ and D- (in terms of length and/or parallelism)
- Check layout and add common mode filter (e.g. ECMF02-2AMX6[Ex1a 1])
2.2. Jitter troubleshooting
2.3. Level attenuation or Signal-to-Noise troubleshooting
2.4. Rising edge or Falling edge troubleshooting
2.5. Ripple troubleshooting
- References: