Other Parts Discussed in Thread: TPS65988
Hi,
We have met an issue about USB can't detect normally.
Below is the test process.
(1) Plug in a DP cable to USB2
(2) Plug in a USB dongle to USB1
(3) Then we found USB1 can't normal detect, and CC level seems has been latched.
(4) Plug out USB2 DP cable, then USB1 USB dongle can be detected, and CC level resume to normal level.
Please refer to the below waveform for USB1 and USB2 CC1/CC2
CH1: USB1 CC1
CH2: USB1 CC2
CH3: USB2 CC1
CH4: USB2 CC2
Waveform 1: Step 1 to Step 3
Waveform 1: Step 4 Plug out USB2 DP cable
And if we swap USB1 and USB2 role, plug DP cable to USB1 first, then plug USB dongle to USB2, the detect behavior can be finished normally.
We also tried flash this firmware to TPS65988 EVM but can't reproduce this issue.
Please add me friend, I will pass the schematic to you for double check.
And attached LOG and firmware file as below.
Thanks!
Jeff