Schematic is as below, buffer is used for MDC (12MHz/6MHz) signals, crosstalk issue is happened on MDC signals. Now I think there is crosstalk of the buffer when multiple channels are open to use. Pleae help verify.
MDC Waveform (Yellow):
1. Test pointed at TP1, crosstalk issue as below.
2. Test pointed at TP2, crosstalk issue as below.
3.Test pointed at TP3: Waveform is ok, no crosstalk.
4.Remove series resistor R791 which is placed closed to buffer, test pointed at TP4, Waveform still has crosstalk issue.
5.Remove series resistor R724 which is placed closed to driver, test pointed at TP4, Waveform is ok, no crosstalk.
