TUSB8020B: Ubuntu 20.04 v1.8 test, ipmi power cycle

Hi Allen:

   Can you explain the test more? What is 12V used for?

Best

Brian

Hi Brian,

This CPU board has two USB3.0 paths.

The current configuration is to take the P0 path,

which will be sent to the motherboard and I/O port through the Hub on the CPU board.

HI Allen:

    If customer power on and off 12V and 5V at the same time, does the issue  still   happened?

  From schematic , it seems there is no VBus control for hub downstream port 2.

  Can you also send schematic for main board with redriver.

Best

Brian

Hi Brian,

On CPU board schematic, CPU USB3_P0 one by one connect to Hub, and the Hub USB_VBUS signal only connect to pull high/low.

I don’t know the downstream port 2 does it means?

Attach file is USB3.0 path from CPU to Main board, I have high-light color for you refer, thanks.

TUSB8020B has one upstream port and two downstream ports ( DN1 and DN2).

did you forgot to upload schematic?

Best

Brian

Hi Brian,

I am Ufispace RD Andy, attach file is my USB3.0 path schematic, please help check it, thanks.

USB3.0_Path_Schematic.pdf

HI Andy:

   Is U36 connected to USB type-A connector? If yes, then please replace C 226/C227 with 0 ohm resistor.

Best

Brian

Hi Brian,

Yes, U36 is connect to USB3.0 type A I/O port.

Ok, I can replace C226/C227 to 0ohm and do test, thanks.

ok, please keep update.

Best

Brian

any update?