Hi, E2E
We use TUSB8020B, and connect USB2.0 device(ASIC and camera) on USB_DP/DM_DN1 and DN2 ports.
In one customer, cannot detect devices on USB2.0. And check the board,
Crystal signal: OK *24MHz signal input
USB_DP/DN_UP: OK *some signal is input
VDD :OK *1.2V is input
VDD33:OK *3.3V is input
USB_VBUS: OK *0.75V input when connecting USB cable
*OVERCUR1z/2z : OK *Pulled up to 3.3V
*GRSTz : OK * Lo to Hi
USB_R1: Connect ground thru 9.53kohm resistor.
USB_DP/DM_DN1: NG *No signal swing
USB_DP/DM_DN2 : NG *No signal swing
The other terminals are left open.
In this case, where should we check about?
And is there any way to check if it is broken?
Best regards.
