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TUSB1211 charger detection

Other Parts Discussed in Thread: BQ24157

We have customer using TUSb1211+BQ24157 in tablet project.

Some usb wire working correct. Some usb wire cannot work correct for charge.

 Plug in USB,  TUSB1211 will give SOC following information: SDPàunknownàSDP,   how to avoid TUSB1211 give Unknow information?

following is test waveform, blue Vbus, yellow DP, pink DM.

Abnormal:

Normal:

why abnormal waveform have defferent voltage level?

regards,

Jeff